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Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Tube support  

Science Conference Proceedings (OSTI)

A tube support for supporting horizontal tubes from an inclined vertical support tube passing between the horizontal tubes. A support button is welded to the vertical support tube. Two clamping bars or plates, the lower edges of one bearing on the support button, are removably bolted to the inclined vertical tube. The clamping bars provide upper and lower surface support for the horizontal tubes.

Mullinax, Jerry L. (Green Township, Summit County, OH)

1988-01-01T23:59:59.000Z

2

TUBE TESTER  

DOE Patents (OSTI)

This patent relates to tube testing, and in particular describes a tube tester for automatic testing of a number of vacuum tubes while in service and as frequently as may be desired. In it broadest aspects the tube tester compares a particular tube with a standard tube tarough a difference amplifier. An unbalanced condition in the circuit of the latter produced by excessive deviation of the tube in its characteristics from standard actuates a switch mechanism stopping the testing cycle and indicating the defective tube.

Gittings, H.T. Jr.; Kalbach, J.F.

1958-01-14T23:59:59.000Z

3

Tube Forming  

Science Conference Proceedings (OSTI)

...The rear-axle housing shown in Fig. 19 was produced from 1035 steel tubing in seven manufacturing operations.

4

Pressure Tubes  

Science Conference Proceedings (OSTI)

Table 8   Specifications for carbon and alloy steel pressure tubes (ASTM)...medium-strength carbon-molybdenum alloy

5

Protective tubes for sodium heated water tubes  

DOE Patents (OSTI)

A heat exchanger in which water tubes are heated by liquid sodium which minimizes the results of accidental contact between the water and the sodium caused by failure of one or more of the water tubes. A cylindrical protective tube envelopes each water tube and the sodium flows axially in the annular spaces between the protective tubes and the water tubes.

Essebaggers, Jan (39 Honeyman Dr., Succasunna, NJ 07876)

1979-01-01T23:59:59.000Z

6

Multiple tube premixing device  

SciTech Connect

The present application provides a premixer for a combustor. The premixer may include a fuel plenum with a number of fuel tubes and a burner tube with a number of air tubes. The fuel tubes extend about the air tubes.

Uhm, Jong Ho; Varatharajan, Balachandar; Ziminsky, Willy Steve; Kraemer, Gilbert Otto; Yilmaz, Ertan; Lacy, Benjamin; Stevenson, Christian; Felling, David

2012-12-11T23:59:59.000Z

7

Electron tube  

DOE Patents (OSTI)

An electron tube of the present invention includes: a vacuum vessel including a face plate portion made of synthetic silica and having a surface on which a photoelectric surface is provided, a stem portion arranged facing the photoelectric surface and made of synthetic silica, and a side tube portion having one end connected to the face plate portion and the other end connected to the stem portion and made of synthetic silica; a projection portion arranged in the vacuum vessel, extending from the stem portion toward the photoelectric surface, and made of synthetic silica; and an electron detector arranged on the projection portion, for detecting electrons from the photoelectric surface, and made of silicon.

Suyama, Motohiro (Hamamatsu, JP); Fukasawa, Atsuhito (Hamamatsu, JP); Arisaka, Katsushi (Los Angeles, CA); Wang, Hanguo (North Hills, CA)

2011-12-20T23:59:59.000Z

8

Tube furnace  

DOE Patents (OSTI)

A vermiculite insulated tube furnace is heated by a helically-wound resistance wire positioned within a helical groove on the surface of a ceramic cylinder, that in turn is surroundingly disposed about a doubly slotted stainless steel cylindrical liner. For uniform heating, the pitch of the helix is of shorter length over the two end portions of the ceramic cylinder. The furnace is of large volume, provides uniform temperature, offers an extremely precise programmed heating capability, features very rapid cool-down, and has a modest electrical power requirement.

Foster, K.G.; Frohwein, E.J.; Taylor, R.W.; Bowen, D.W.

1990-01-01T23:59:59.000Z

9

Tube Degradation  

E-Print Network (OSTI)

On March 23, 2012, Southern California Edison (SCE) submitted a letter (Reference 1) to the NRC describing actions it planned to take with respect to issues identified in the steam generator (SG) tubes of San Onofre Nuclear Generating Station (SONGS) Units 2 and 3. On March 27,2012, the NRC responded by issuing a Confirmatory Action Letter (CAL) (Reference 2), describing the actions that the NRC and SCE agreed would be completed to address those issues and ensure safe operations. The purpose of this letter is to report the completion of the Unit 2 CAL actions, which are to be completed prior to entry of Unit 2 into

An Edison; Inter Natlonal Compan; Peter T. Dietrich; Elmo E. Collins; Regional Administrator; Region Iv

2012-01-01T23:59:59.000Z

10

Tube-in-tube thermophotovoltaic generator  

DOE Patents (OSTI)

A thermophotovoltaic device includes at least one thermal radiator tube, a cooling tube concentrically disposed within each thermal radiator tube and an array of thermophotovoltaic cells disposed on the exterior surface of the cooling tube. A shell having a first end and a second end surrounds the thermal radiator tube. Inner and outer tubesheets, each having an aperture corresponding to each cooling tube, are located at each end of the shell. The thermal radiator tube extends within the shell between the inner tubesheets. The cooling tube extends within the shell through the corresponding apertures of the two inner tubesheets to the corresponding apertures of the two outer tubesheets. A plurality of the thermal radiator tubes can be arranged in a staggered or an in-line configuration within the shell. 8 figs.

Ashcroft, J.; Campbell, B.; DePoy, D.

1998-06-30T23:59:59.000Z

11

Tube-in-tube thermophotovoltaic generator  

DOE Patents (OSTI)

A thermophotovoltaic device includes at least one thermal radiator tube, a cooling tube concentrically disposed within each thermal radiator tube and an array of thermophotovoltaic cells disposed on the exterior surface of the cooling tube. A shell having a first end and a second end surrounds the thermal radiator tube. Inner and outer tubesheets, each having an aperture corresponding to each cooling tube, are located at each end of the shell. The thermal radiator tube extends within the shell between the inner tubesheets. The cooling tube extends within the shell through the corresponding apertures of the two inner tubesheets to the corresponding apertures of the two outer tubesheets. A plurality of the thermal radiator tubes can be arranged in a staggered or an in-line configuration within the shell.

Ashcroft, John (Scotia, NY); Campbell, Brian (Scotia, NY); DePoy, David (Clifton Park, NY)

1998-01-01T23:59:59.000Z

12

A tube-in-tube thermophotovoltaic generator  

DOE Patents (OSTI)

A thermophotovoltaic device includes at least one thermal radiator tube, a cooling tube concentrically disposed within each thermal radiator tube and an array of thermophotovoltaic cells disposed on the exterior surface of the cooling tube. A shell having a first end and a second end surrounds the thermal radiator tube. Inner and outer tubesheets, each having an aperture corresponding to each cooling tube, are located at each end of the shell. The thermal radiator tube extends within the shell between the inner tubesheets. The cooling tube extends within the shell through the corresponding apertures of the two inner tubesheets to the corresponding apertures of the two outer tubesheets. A plurality of the thermal radiator tubes can be arranged in a staggered or an in-line configuration within the shell.

Ashcroft, J.; Campbell, B.; Depoy, D.

1996-12-31T23:59:59.000Z

13

Heat exchanger tube mounts  

DOE Patents (OSTI)

A heat exchanger in which tubes are secured to a tube sheet by internal bore welding is described. The tubes may be moved into place in preparation for welding with comparatively little trouble. A number of segmented tube support plates are provided which allow a considerable portion of each of the tubes to be moved laterally after the end thereof has been positioned in preparation for internal bore welding to the tube sheet. (auth)

Wolowodiuk, W.; Anelli, J.; Dawson, B.E.

1974-01-01T23:59:59.000Z

14

Anodization of process tubes  

SciTech Connect

This report discusses the presence of corrosion products upon aluminum process tubes removed from wet portions of F Pile which led to the suspicion that the tubes might be corroding at an accelerated rate because of water entrapped in the channels between the tubes and the graphite blocks. Corrosion was especially noted on those tubes that were tightly stuck within the blocks. Analysis of the corrosion products showed that the major constituent was a hydrated aluminum oxide, containing iron oxide, calcium carbonate, and other substances in lower concentrations. This led to placement of an order for the anodizing of 200 process tubes.

Pitzer, E.C.

1952-09-17T23:59:59.000Z

15

Conduction cooled tube supports  

DOE Patents (OSTI)

In boilers, process tubes are suspended by means of support studs that are in thermal contact with and attached to the metal roof casing of the boiler and the upper bend portions of the process tubes. The support studs are sufficiently short that when the boiler is in use, the support studs are cooled by conduction of heat to the process tubes and the roof casing thereby maintaining the temperature of the stud so that it does not exceed 1400.degree. F.

Worley, Arthur C. (Mt. Tabor, NJ); Becht, IV, Charles (Morristown, NJ)

1984-01-01T23:59:59.000Z

16

Coiled Tubing Safety Manual  

SciTech Connect

This document addresses safety concerns regarding the use of coiled tubing as it pertains to the preservation of personnel, environment and the wellbore.

Crow, W.

1999-04-06T23:59:59.000Z

17

Wound tube heat exchanger  

DOE Patents (OSTI)

What is disclosed is a wound tube heat exchanger in which a plurality of tubes having flattened areas are held contiguous adjacent flattened areas of tubes by a plurality of windings to give a double walled heat exchanger. The plurality of windings serve as a plurality of effective force vectors holding the conduits contiguous heat conducting walls of another conduit and result in highly efficient heat transfer. The resulting heat exchange bundle is economical and can be coiled into the desired shape. Also disclosed are specific embodiments such as the one in which the tubes are expanded against their windings after being coiled to insure highly efficient heat transfer.

Ecker, Amir L. (Duncanville, TX)

1983-01-01T23:59:59.000Z

18

Photomultiplier tube saturation indicator  

DOE Patents (OSTI)

A photomultiplier tube saturation indicator is formed by supplying a supplemental light source, typically a light emitting diode (LED), adjacent to the photomultiplier tube. A switch allows the light source to be activated. The light is forwarded to the photomultiplier tube by an optical fiber. If the probe is properly light tight, then a meter attached to the indicator will register the light from the LED. If the probe is no longer light tight, and the saturation indicator is saturated, no signal will be registered when the LED is activated. This photomultiplier tube is used with alpha contamination probes.

Ruch, J.F.; Urban, D.J.

1995-12-31T23:59:59.000Z

19

Steam generator tube failures  

SciTech Connect

A review and summary of the available information on steam generator tubing failures and the impact of these failures on plant safety is presented. The following topics are covered: pressurized water reactor (PWR), Canadian deuterium uranium (CANDU) reactor, and Russian water moderated, water cooled energy reactor (VVER) steam generator degradation, PWR steam generator tube ruptures, the thermal-hydraulic response of a PWR plant with a faulted steam generator, the risk significance of steam generator tube rupture accidents, tubing inspection requirements and fitness-for-service criteria in various countries, and defect detection reliability and sizing accuracy. A significant number of steam generator tubes are defective and are removed from service or repaired each year. This wide spread damage has been caused by many diverse degradation mechanisms, some of which are difficult to detect and predict. In addition, spontaneous tube ruptures have occurred at the rate of about one every 2 years over the last 20 years, and incipient tube ruptures (tube failures usually identified with leak detection monitors just before rupture) have been occurring at the rate of about one per year. These ruptures have caused complex plant transients which have not always been easy for the reactor operators to control. Our analysis shows that if more than 15 tubes rupture during a main steam line break, the system response could lead to core melting. Although spontaneous and induced steam generator tube ruptures are small contributors to the total core damage frequency calculated in probabilistic risk assessments, they are risk significant because the radionuclides are likely to bypass the reactor containment building. The frequency of steam generator tube ruptures can be significantly reduced through appropriate and timely inspections and repairs or removal from service.

MacDonald, P.E.; Shah, V.N.; Ward, L.W.; Ellison, P.G.

1996-04-01T23:59:59.000Z

20

Boiler Stack Economizer Tube Failure  

Science Conference Proceedings (OSTI)

Presentation Title, Boiler Stack Economizer Tube Failure ... performed to investigate the failure of a type 304 stainless steel tube from a boiler stack economizer.

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

YouTube  

Energy.gov (U.S. Department of Energy (DOE))

Note: Since the YouTube platform is always evolving, so are our best practices for using it. We welcome feedback and suggestions to keep processes current and up-to-date.For more information, read...

22

Profilometer for tubes  

DOE Patents (OSTI)

An apparatus for inspecting interior surfaces of tubes or pipes. A spring-loaded sensor pin, slidably mounted in a rotatable housing is displaced in the housing as the housing is rotated. A centering means maintains spacing of the housing with respect to the tube wall. Displacement of the sensor pin in the housing are converted to measurable electrical signals by a linearly variable differential transformer.

Livingston, R.A.

1986-08-22T23:59:59.000Z

23

Shock Tube Design  

E-Print Network (OSTI)

Shock accelerated flows exhibit some of the most violent and complex mechanisms in nature by which two separate fluids can be mixed. The Richtmyer-Meshkov instability (RMI) is generated when a perturbed interface between two fluids is impulsively accelerated by a shock wave. In order to further study the phenomenon of the RMI, a new shock tube will be designed. This shock tube will have the capability to change the angle of inclination, allowing for a diverse possibility of fluid interfaces, and provide two driver sections to allow for dual shock capability. The tube was designed to accommodate a 2.5 MACH shockwave, and incorporated a factor of safety of 3 in the design. A modular approach to design was followed to allow further diversification of the shock tube by changing the configuration of the modules. A circular driver section was used to maximize volume and a square driven section was used to minimize affects from the boundary layer. A slide rail mechanism was devised for changing the diaphragms which allows a single person to change the diaphragm in a timely manner. The entire tube is supported on an I-beam to maintain the rigidity of the system while inclined. To accommodate a variable inclination, a hybrid winch support system was designed. A winch changes the angle of the tube and a telescoping support system maintains the position during experimentation. It was determined after running COSMOS finite element stress analysis, that with the 2.5 MPa internal pressure associated with a 2.5 MACH shock wave, a 19.05 mm sidewall thickness was needed to provide a factor of safety of 3.

Koppenberger, Peter K.

2010-05-01T23:59:59.000Z

24

Tubing on the Ichetucknee Countries  

E-Print Network (OSTI)

, crystal clear water of the Ichetucknee River while you relax in an inner tube. Enjoy the Florida sunshine

Príncipe, José Carlos

25

Photomultiplier Tube Home  

NLE Websites -- All DOE Office Websites (Extended Search)

Project Homepage Project Homepage Classroom Projects Homepage - Teacher Homepage - Student Homepage Abstract: Photons are created in scintillator devices in most modern particle detectors. These photons yield information about particle collisions that must be measured and decoded. This Website follows the track of a photon as it enters a photomultiplier tube (pmt), an amplifying device that increases the effect of a single photon to levels that are measurable. This signal amplification is crucial; without it, no information exists for decoding. The site presents information regarding the innards of a pmt and allows students to investigate predictive mathematical models describing the signal increase under different, adjustable parameters. Introduction to Research: Photomultipler tubes are omnipresent in particle physics. Understanding the

26

Induction plasma tube  

DOE Patents (OSTI)

An induction plasma tube having a segmented, fluid-cooled internal radiation shield is disclosed. The individual segments are thick in cross-section such that the shield occupies a substantial fraction of the internal volume of the plasma enclosure, resulting in improved performance and higher sustainable plasma temperatures. The individual segments of the shield are preferably cooled by means of a counterflow fluid cooling system wherein each segment includes a central bore and a fluid supply tube extending into the bore. The counterflow cooling system results in improved cooling of the individual segments and also permits use of relatively larger shield segments which permit improved electromagnetic coupling between the induction coil and a plasma located inside the shield. Four embodiments of the invention, each having particular advantages, are disclosed.

Hull, D.E.

1982-07-02T23:59:59.000Z

27

Induction plasma tube  

DOE Patents (OSTI)

An induction plasma tube having a segmented, fluid-cooled internal radiation shield is disclosed. The individual segments are thick in cross-section such that the shield occupies a substantial fraction of the internal volume of the plasma enclosure, resulting in improved performance and higher sustainable plasma temperatures. The individual segments of the shield are preferably cooled by means of a counterflow fluid cooling system wherein each segment includes a central bore and a fluid supply tube extending into the bore. The counterflow cooling system results in improved cooling of the individual segments and also permits use of relatively larger shield segments which permit improved electromagnetic coupling between the induction coil and a plasma located inside the shield. Four embodiments of the invention, each having particular advantages, are disclosed.

Hull, Donald E. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

28

Joined concentric tubes  

SciTech Connect

Tubular objects having two or more concentric layers that have different properties are joined to one another during their manufacture primarily by compressive and friction forces generated by shrinkage during sintering and possibly mechanical interlocking. It is not necessary for the concentric tubes to display adhesive-, chemical- or sinter-bonding to each other in order to achieve a strong bond. This facilitates joining of dissimilar materials, such as ceramics and metals.

DeJonghe, Lutgard; Jacobson, Craig; Tucker, Michael; Visco, Steven

2013-01-01T23:59:59.000Z

29

Novel Tube-in-Tube System Simplifies Subsurface Fluid Sampling ...  

* Retrieval of single or multiphase high-purity samples More Information Freifeld, B. M., 2009, The U-tube: a new paradigm in borehole fluid sampling ...

30

Ion plated electronic tube device  

DOE Patents (OSTI)

An electronic tube and associated circuitry which is produced by ion plating techniques. The process is carried out in an automated process whereby both active and passive devices are produced at very low cost. The circuitry is extremely reliable and is capable of functioning in both high radiation and high temperature environments. The size of the electronic tubes produced are more than an order of magnitude smaller than conventional electronic tubes.

Meek, T.T.

1983-10-18T23:59:59.000Z

31

Field Guide: Boiler Tube Failure  

Science Conference Proceedings (OSTI)

In conventional and combined-cycle plants, boiler tube failures (BTFs) have been the main availability problem for as long as reliable statistics have been kept for each generating source. The three volumes of the Electric Power Research Institute (EPRI) report Boiler and Heat Recovery Steam Generator Tube Failures: Theory and Practice (1012757) present an in-depth discussion of the various BTF and degradation mechanisms, providing plant owners and operators with the technical basis to address tube failu...

2009-12-22T23:59:59.000Z

32

Physics Out Loud - Photomultiplier Tube  

NLE Websites -- All DOE Office Websites (Extended Search)

Particle Resonance Previous Video (Particle Resonance) Physics Out Loud Main Index Next Video (Proton) Proton Photomultiplier Tube One way we "see" the sub-atomic particles in our...

33

TubeTagger - YouTube-based Concept Detection  

Science Conference Proceedings (OSTI)

We present TubeTagger, a concept-based video retrieval system that exploits web video as an information source. The system performs a visual learning on YouTube clips (i. e., it trains detectors for semantic concepts like "soccer" or "windmill"), and ...

Adrian Ulges; Markus Koch; Damian Borth; Thomas M. Breuel

2009-12-01T23:59:59.000Z

34

Explosive welding of a tube into a tube sheet  

DOE Patents (OSTI)

A cartridge containing an explosive charge is placed within a tube assembled within a tube sheet. The charge is detonated through use of a detonator cord containing a minimum but effective amount of explosive material. The cord is contained inside a tubular shield throughout most of its length within the cartridge. A small length of the cord extends beyond the tubular shield to contact and detonate the explosive charge in its rear portion near the cartridge base. The cartridge base is provided of substantial mass and thickness in respect to side and front walls of the cartridge to minimize bulging beyond the rear face of the tube sheet. For remote activation an electrically activated detonator of higher charge density than the cord is attached to the cord at a location spaced from the tube sheet, cartridge and tube.

Green, Sheryll C. (London, OH); Linse, Vonne D. (Columbus, OH)

1978-10-03T23:59:59.000Z

35

Coiled tubing - Operations and services  

Science Conference Proceedings (OSTI)

Drilling with a continuous (rather than jointed) drill string is an old concept that is gaining new attention as a result of recent advances made in coiled tubing and drilling technology. The development of larger diameter, reliable, high-strength coiled tubing and smaller diameter, positive displacement motors, orienting tools, surveying systems and fixed cutting drill bits have given drilling with a continuous drill string a capability that was previously unattainable. Like its many other uses, (e.g., squeeze cementing, wellbore cleanouts, flow initiation, logging) the continuity of coiled tubing gives it several advantages over conventional drill strings. These include: drilling underbalanced safely, significantly reduced trip time, continuous circulation, smaller surface requirements. Coiled tubing drilling operations have smaller surface lease requirements than most conventional rigs due to the smaller footprint of the coiled tubing unit and associated equipment. Current coiled tubing drilling operations have the following limitations: conventional rig assistance is required for well preparation; conventional rigs must assist in running long protective and production casing strings or liners; hole sizes are smaller; working depth capabilities are shallower, coiled tubing life is less. This paper goes on to discuss the history of continuous drill strings and includes information on tubing units, circulating systems, drilling fluids, well control systems, downhole tools, orientation tools, and bottomhole assemblies. It then gives a cost comparison and an application of this type of drilling.

Gronseth, J.M. (Imperial Oil Resources Ltd., Calgary, Alberta (Canada))

1993-04-01T23:59:59.000Z

36

Widget:YouTube | Open Energy Information  

Open Energy Info (EERE)

icon Widget:YouTube Jump to: navigation, search This widget displays a YouTube video. Parameters id - the YouTube video id (this is the v parameter or the code at the end...

37

Water-storage-tube systems. Final report  

DOE Green Energy (OSTI)

Passive solar collection/storage/distribution systems were surveyed, designed, fabricated, and mechanically and thermally tested. The types studied were clear and opaque fiberglass tubes, metal tubes with plastic liners, and thermosyphoning tubes. (MHR)

Hemker, P.

1981-12-24T23:59:59.000Z

38

Tubing drain valve  

SciTech Connect

A method is described for operating a valve means. The valve means comprises a tubular piston movable within a tubular member suitable for use in a borehole pipe string to open and close a port through the wall of the tubular member. The method comprises: biassing the valve means in its closed position; pressurizing the interior of the piston to a predetermined pressure to overcome the biassing closed force and to actuate the valve means to its open position; biassing the valve means to its open position; and actuating the valve means to its closed position by engaging a first arm of a dog pivotally mounted on the piston with an engaging means insertable through the interior of the tubular piston; moving the piston relative to the tubular member; rotating the dog about its pivot to bring a second arm of the dog into contact with a detent in the tubular member; and applying sufficient force to the first arm to continue rotating the dog about the pivot, while engaging the detent with the second arm of the dog, in order to overcome the biassing open force to actuate the valve means to its closed position. A tubing drain valve suitable for use in a borehole pipe string, comprising: a sub suitable for incorporating within a borehole pipe string; and a port between the interior and the exterior of the sub; and valve means for opening and closing the port.

Soderberg, P.B.

1987-02-24T23:59:59.000Z

39

Method of making straight fuel cell tubes  

DOE Patents (OSTI)

A method and an apparatus for making straight fuel cell tubes are disclosed. Extruded tubes comprising powders of fuel cell material and a solvent are dried by rotating the extruded tubes. The rotation process provides uniform circumferential drying which results in uniform linear shrinkage of the tubes. The resultant dried tubes are very straight, thereby eliminating subsequent straightening steps required with conventional processes. The method is particularly useful for forming inner air electrode tubes of solid oxide fuel cells.

Borglum, Brian P. (Edgewood, PA)

2001-01-01T23:59:59.000Z

40

Steam generator tube rupture study  

E-Print Network (OSTI)

This report describes our investigation of steam generator behavior during a postulated tube rupture accident. Our study was performed using the steam generator, thermal-hydraulic analysis code THERMIT-UTSG. The purpose ...

Free, Scott Thomas

1986-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Tube-wave seismic imaging  

DOE Patents (OSTI)

The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (111), travels in the source well (110), is coupled to a geological feature (140), propagates (151) through the geological feature (140), is coupled back to a tube-wave (152) at a receiver well (120), and is and received by receiver(s) (121) in either the same (110) or a different receiving well (120). The tube-wave has been shown to be extremely sensitive to changes in reservoir characteristics. Tube-waves appear to couple most effectively to reservoirs where the well casing is perforated, allowing direct fluid contact from the interior of a well case to the reservoir.

Korneev, Valeri A [LaFayette, CA

2009-05-05T23:59:59.000Z

42

Tube-wave seismic imaging  

DOE Patents (OSTI)

The detailed analysis of cross well seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded approximately 2000 feet above the reservoir. A tube-wave (150) is initiated in a source well (110) by a source (111), travels in the source well (110), is coupled to a geological feature (140), propagates (151) through the geological feature (140), is coupled back to a tube-wave (152) at a receiver well (120), and is and received by receiver(s) (121) in either the same (110) or a different receiving well (120). The tube-wave has been shown to be extremely sensitive to changes in reservoir characteristics. Tube-waves appear to couple most effectively to reservoirs where the well casing is perforated, allowing direct fluid contact from the interior of a well case to the reservoir.

Korneev, Valeri A. (Lafayette, CA); Bakulin, Andrey (Houston, TX)

2009-10-13T23:59:59.000Z

43

Photomultiplier tube gain regulating system  

DOE Patents (OSTI)

This invention relates to an improved system for regulating the gain of a photomultiplier tube, and was designed for use with the photomultiplier tubes of a GeMSAEC fast analyzers. It has the following advantages over the prior system: noise is virtually eliminated; sample analysis can begin after 3 to 4 revolutions of the rotor; fluorescent and light scattering solutions can be used as a reference; and the reference solution can be in any cuvette on the rotor.

Johnson, Wayne F. (Loudon, TN)

1976-01-01T23:59:59.000Z

44

Tube wall thickness measurement apparatus  

DOE Patents (OSTI)

An apparatus for measuring the thickness of a tube's wall for the tube's entire length and circumference by determining the deviation of the tube wall thickness from the known thickness of a selected standard item. The apparatus comprises a base and a first support member having first and second ends. The first end is connected to the base and the second end is connected to a spherical element. A second support member is connected to the base and spaced apart from the first support member. A positioning element is connected to and movable relative to the second support member. An indicator is connected to the positioning element and is movable to a location proximate the spherical element. The indicator includes a contact ball for first contacting the selected standard item and holding it against the spherical element. The contact ball then contacts the tube when the tube is disposed about the spherical element. The indicator includes a dial having a rotatable needle for indicating the deviation of the tube wall thickness from the thickness of the selected standard item.

Lagasse, Paul R. (Santa Fe, NM)

1987-01-01T23:59:59.000Z

45

Tube wall thickness measurement apparatus  

DOE Patents (OSTI)

An apparatus for measuring the thickness of a tube's wall for the tube's entire length and radius by determining the deviation of the tube wall thickness from the known thickness of a selected standard item. The apparatus comprises a base and a first support member having first and second ends. The first end is connected to the base and the second end is connected to a spherical element. A second support member is connected to the base and spaced apart from the first support member. A positioning element is connected to and movable relative to the second support member. An indicator is connected to the positioning element and is movable to a location proximate the spherical element. The indicator includes a contact ball for first contacting the selected standard item and holding it against the spherical element. The contact ball then contacts the tube when the tube is disposed about the spherical element. The indicator includes a dial having a rotatable needle for indicating the deviation of the tube wall thickness from the thickness of the selected standard item.

Lagasse, P.R.

1985-06-21T23:59:59.000Z

46

Core-tube data logger  

DOE Green Energy (OSTI)

Wireline core drilling, increasingly used for geothermal exploration, employs a core-tube to capture a rock core sample during drilling. Three types of core-tube data loggers (CTDL) have been built and tested to date by Sandia national Laboratories. They are: (1) temperature-only logger, (2) temperature/inclinometer logger and (3) heat-shielded temperature/inclinometer logger. All were tested during core drilling operations using standard wireline diamond core drilling equipment. While these tools are designed for core-tube deployment, the tool lends itself to be adapted to other drilling modes and equipment. Topics covered in this paper include: (1) description on how the CTDLs are implemented, (2) the components of the system, (3) the type of data one can expect from this type of tool, (4) lessons learned, (5) comparison to its counterpart and (6) future work.

Henfling, J.A.; Normann, R.A.; Knudsen, S.; Drumheller, D.

1997-01-01T23:59:59.000Z

47

Ceramic vacuum tubes for geothermal well logging  

DOE Green Energy (OSTI)

Useful design data acquired in the evaluation of ceramic vacuum tubes for the development of a 500/sup 0/C instrumentation amplifier are presented. The general requirements for ceramic vacuum tubes are discussed for application to the development of high temperature well logs. Commercially available tubes are described and future contract activities that specifically relate to ceramic vacuum tubes are detailed. Supplemental data are presented in the appendix.

Kelly, R.D.

1977-01-01T23:59:59.000Z

48

NIST Launches YouTube Channel  

Science Conference Proceedings (OSTI)

... The Department of Commerce negotiated a contract with Google that allows its agencies to establish YouTube channels. ...

2011-04-06T23:59:59.000Z

49

Manual tube-to-tubesheet welding torch  

DOE Patents (OSTI)

A welding torch made of a high temperature plastic which fits over a tube intermediate the ends thereof for welding the juncture between the tube and the back side of a tube plate and has a ballooned end in which an electrode, filler wire guide, fiber optic bundle, and blanketing gas duct are disposed.

Kiefer, Joseph H. (Tampa, FL); Smith, Danny J. (Tampa, FL)

1982-01-01T23:59:59.000Z

50

Spring/dimple instrument tube restraint  

DOE Patents (OSTI)

A nuclear fuel assembly for a pressurized water nuclear reactor has a spring and dimple structure formed in a non-radioactive insert tube placed in the top of a sensor receiving instrumentation tube thimble disposed in the fuel assembly and attached at a top nozzle, a bottom nozzle, and intermediate grids. The instrumentation tube thimble is open at the top, where the sensor or its connection extends through the cooling water for coupling to a sensor signal processor. The spring and dimple insert tube is mounted within the instrumentation tube thimble and extends downwardly adjacent the top. The springs and dimples restrain the sensor and its connections against lateral displacement causing impact with the instrumentation tube thimble due to the strong axial flow of cooling water. The instrumentation tube has a stainless steel outer sleeve and a zirconium alloy inner sleeve below the insert tube adjacent the top. The insert tube is relatively non-radioactivated inconel alloy. The opposed springs and dimples are formed on diametrically opposite inner walls of the insert tube, the springs being formed as spaced axial cuts in the insert tube, with a web of the insert tube between the cuts bowed radially inwardly for forming the spring, and the dimples being formed as radially inward protrusions opposed to the springs. 7 figures.

DeMario, E.E.; Lawson, C.N.

1993-11-23T23:59:59.000Z

51

Spring/dimple instrument tube restraint  

DOE Patents (OSTI)

A nuclear fuel assembly for a pressurized water nuclear reactor has a spring and dimple structure formed in a non-radioactive insert tube placed in the top of a sensor receiving instrumentation tube thimble disposed in the fuel assembly and attached at a top nozzle, a bottom nozzle, and intermediate grids. The instrumentation tube thimble is open at the top, where the sensor or its connection extends through the cooling water for coupling to a sensor signal processor. The spring and dimple insert tube is mounted within the instrumentation tube thimble and extends downwardly adjacent the top. The springs and dimples restrain the sensor and its connections against lateral displacement causing impact with the instrumentation tube thimble due to the strong axial flow of cooling water. The instrumentation tube has a stainless steel outer sleeve and a zirconium alloy inner sleeve below the insert tube adjacent the top. The insert tube is relatively non-radioactivated inconel alloy. The opposed springs and dimples are formed on diametrically opposite inner walls of the insert tube, the springs being formed as spaced axial cuts in the insert tube, with a web of the insert tube between the cuts bowed radially inwardly for forming the spring, and the dimples being formed as radially inward protrusions opposed to the springs.

DeMario, Edmund E. (Columbia, SC); Lawson, Charles N. (Columbia, SC)

1993-01-01T23:59:59.000Z

52

Heat exchanger with a removable tube section  

DOE Patents (OSTI)

A heat exchanger is described in which the tube sheet is secured against primary liquid pressure, but which allows for easy removal of the tube section. The tube section is supported by a flange which is secured by a number of shear blocks, each of which extends into a slot which is immovable with respect to the outer shell of the heat exchanger. (auth)

Wolowodiuk, W.; Anelli, J.

1975-07-29T23:59:59.000Z

53

Steam Generator Tube-Plugging and Tube-Sleeving Criteria: Assessment of Current Practices  

Science Conference Proceedings (OSTI)

This report presents a survey of current utility practices regarding steam generator tube plugging and tube sleeving. It also describes an analytic and experimental evaluation of mechanical strain as a parameter for use in tube-plugging and tube-sleeving criteria.

1983-03-01T23:59:59.000Z

54

Ionization tube simmer current circuit  

DOE Patents (OSTI)

A highly efficient flash lamp simmer current circuit utilizes a fifty percent duty cycle square wave pulse generator to pass a current over a current limiting inductor to a full wave rectifier. The DC output of the rectifier is then passed over a voltage smoothing capacitor through a reverse current blocking diode to a flash lamp tube to sustain ionization in the tube between discharges via a small simmer current. An alternate embodiment of the circuit combines the pulse generator and inductor in the form of an FET off line square wave generator with an impedance limited step up output transformer which is then applied to the full wave rectifier as before to yield a similar simmer current.

Steinkraus, Jr., Robert F. (Livermore, CA)

1994-01-01T23:59:59.000Z

55

HIGH CURRENT COAXIAL PHOTOMULTIPLIER TUBE  

DOE Patents (OSTI)

A medium-gain photomultiplier tube having high current output, fast rise- time, and matched output impedance was developed. The photomultiplier tube comprises an elongated cylindrical envelope, a cylindrical anode supported at the axis of the envelope, a plurality of elongated spaced opaque areas on the envelope, and a plurality of light admitting windows. A photo-cathode is supported adjacent to each of the windows, and a plurality of secondary emissive dynodes are arranged in two types of radial arrays which are alternately positioned to fill the annular space between the anode and the envelope. The dynodes are in an array being radially staggered with respect to the dynodes in the adjacent array, the dynodes each having a portion arranged at an angle with respect to the electron path, such that electrons emitted by each cathode undergo multiplication upon impingement on a dynode and redirected flight to the next adjacent dynode.

Glass, N.W.

1960-01-19T23:59:59.000Z

56

Ionization tube simmer current circuit  

DOE Patents (OSTI)

A highly efficient flash lamp simmer current circuit utilizes a fifty percent duty cycle square wave pulse generator to pass a current over a current limiting inductor to a full wave rectifier. The DC output of the rectifier is then passed over a voltage smoothing capacitor through a reverse current blocking diode to a flash lamp tube to sustain ionization in the tube between discharges via a small simmer current. An alternate embodiment of the circuit combines the pulse generator and inductor in the form of an FET off line square wave generator with an impedance limited step up output transformer which is then applied to the full wave rectifier as before to yield a similar simmer current. 6 figures.

Steinkraus, R.F. Jr.

1994-12-13T23:59:59.000Z

57

Cold cathode vacuum discharge tube  

DOE Patents (OSTI)

A cold cathode vacuum discharge tube, and method for making same, with an interior surface of the trigger probe coated with carbon deposited by carbon vapor deposition (CVD) or diamond-like carbon (DLC) deposition. Preferably a solid graphite insert is employed in the probe-cathode structure in place of an aluminum bushing employed in the prior art. The CVD or DLC probe face is laser scribed to allow resistance trimming to match available trigger voltage signals and to reduce electrical aging.

Boettcher, Gordon E. (Albuquerque, NM)

1998-01-01T23:59:59.000Z

58

Film holder for radiographing tubing  

DOE Patents (OSTI)

A film cassette is provided which may be easily placed about tubing or piping and readily held in place while radiographic inspection is performed. A pair of precurved light-impervious semi-rigid plastic sheets, hinged at one edge, enclose sheet film together with any metallic foils or screens. Other edges are made light-tight with removable caps, and the entire unit is held securely about the object to be radiographed with a releasable fastener such as a strip of Velcro.

Davis, Earl V. (Oak Ridge, TN); Foster, Billy E. (Oak Ridge, TN)

1976-01-01T23:59:59.000Z

59

Underbalanced coiled tubing sidetrack successful  

Science Conference Proceedings (OSTI)

The technique of drilling through a completion string, underbalanced, with coiled tubing eliminated some of the problems encountered with overbalanced drilling in a group of offset wells. This project confirmed that performing drilling operations in live wells can be carried out safely and effectively. Dalen is a sour gas field in the eastern part of The Netherlands and produces from vertical fractures in the Zechstein carbonate reservoir. The proposal for Dalen 2 was to abandon the lower section of the original hole and subsequently sidetrack conventionally to the top of the reservoir, run and cement a 5-in. liner, complete the well with a 5-in. monobore completion, and install the christmas tree. This part of the operation would be performed with a workover hoist. Thereafter, a 3 3/4-in. hole would be drilled through the completion and into the reservoir, underbalanced with coiled tubing. The drilling proposal had to address a number of key issues: creating underbalanced conditions; handling sour gas production at surface; handling and treating drilling fluids at surface; removing drilled solids from the returned fluid system; and deploying a long coiled tubing drilling bottom hole assembly (BHA) into a live well. The paper discusses planning, legislative issues, well preparation, the drilling program, and lessons learned.

Adam, J.; Berry, M. [Nederlandse Aardolie Maatschappij B.V., Assen (Netherlands)

1995-12-18T23:59:59.000Z

60

Turbine nozzle stage having thermocouple guide tube  

SciTech Connect

A guide tube is fixed adjacent opposite ends in outer and inner covers of a nozzle stage segment. The guide tube is serpentine in shape between the outer and inner covers and extends through a nozzle vane. An insert is disposed in the nozzle vane and has apertures to accommodate serpentine portions of the guide tube. Cooling steam is also supplied through chambers of the insert on opposite sides of a central insert chamber containing the guide tube. The opposite ends of the guide tube are fixed to sleeves, in turn fixed to the outer and inner covers.

Schotsch, Margaret Jones (Greer, SC); Kirkpatrick, Francis Lawrence (late of Galway, NY); Lapine, Eric Michael (Northwood, NH)

2002-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Ceramic vacuum tubes for geothermal well logging  

DOE Green Energy (OSTI)

The results of investigations carried out into the availability and suitability of ceramic vacuum tubes for the development of logging tools for geothermal wells are summarized. Design data acquired in the evaluation of ceramic vacuum tubes for the development of a 500/sup 0/C instrumentation amplifier are presented. The general requirements for ceramic vacuum tubes for application to the development of high temperature well logs are discussed. Commercially available tubes are described and future contract activities that specifically relate to ceramic vacuum tubes are detailed. Supplemental data is presented in the appendix. (MHR)

Kelly, R.D.

1977-01-12T23:59:59.000Z

62

Minimum wear tube support hole design  

DOE Patents (OSTI)

A minimum-wear through-bore (16) is defined within a heat exchanger tube support plate (14) so as to have an hourglass configuration as determined by means of a constant radiused surface curvature (18) as defined by means of an external radius (R3), wherein the surface (18) extends between the upper surface (20) and lower surface (22) of the tube support plate (14). When a heat exchange tube (12) is disposed within the tube support plate (14) so as to pass through the through-bore (16), the heat exchange tube (12) is always in contact with a smoothly curved or radiused portion of the through-bore surface (16) whereby unacceptably excessive wear upon the heat exchange tube (12), as normally developed by means of sharp edges, lands, ridges, or the like conventionally part of the tube support plates, is eliminated or substantially reduced.

Glatthorn, Raymond H. (St. Petersburg, FL)

1986-01-01T23:59:59.000Z

63

Multi-tube arrangement for combustor and method of making the multi-tube arrangement  

SciTech Connect

A fuel injector tube includes a one piece, unitary, polygonal tube having an inlet end and an outlet end. The fuel injector tube further includes a fuel passage extending from the inlet end to the outlet end along a longitudinal axis of the polygonal tube, a plurality of air passages extending from the inlet end to the outlet end and surrounding the fuel passage, and a plurality of fuel holes. Each fuel hole connects an air passage with the fuel passage. The inlet end of the polygonal tube is formed into a fuel tube. A fuel injector includes a plurality of fuel injector tubes and a plate. The plurality of fuel tubes are connected to the plate adjacent the inlet ends of the plurality of fuel injector tubes.

Ziminsky, Willy Steve (Simpsonville, SC)

2012-07-31T23:59:59.000Z

64

Chromo-Electric flux tubes  

E-Print Network (OSTI)

The profiles of the chromo-electric field generated by static quark-antiquark, $Q{\\bar Q}$ and three-quark, $QQQ$ sources are calculated in Coulomb gauge. Using a variational ansatz for the ground state, we show that a flux tube-like structure emerges and combines to the ``Y''-shape field profile for three static quarks. The properties of the chromo-electric field are, however, not expected to be the same as those of the full action density or the Wilson line and the differences are discussed.

Patrick O. Bowman; Adam P. Szczepaniak

2004-03-07T23:59:59.000Z

65

Cold cathode vacuum discharge tube  

DOE Patents (OSTI)

A cold cathode vacuum discharge tube, and method for making same, are disclosed with an interior surface of the trigger probe coated with carbon deposited by carbon vapor deposition (CVD) or diamond-like carbon (DLC) deposition. Preferably a solid graphite insert is employed in the probe-cathode structure in place of an aluminum bushing employed in the prior art. The CVD or DLC probe face is laser scribed to allow resistance trimming to match available trigger voltage signals and to reduce electrical aging. 15 figs.

Boettcher, G.E.

1998-03-10T23:59:59.000Z

66

Cold cathode vacuum discharge tube  

DOE Patents (OSTI)

A cold cathode vacuum discharge tube, and method for making same, with an interior surface of the trigger probe coated with carbon deposited by chemical vapor deposition (CVD) or diamond-like carbon (DLC) deposition are disclosed. Preferably a solid graphite insert is employed in the probe-cathode structure in place of an aluminum bushing employed in the prior art. The CVD or DLC probe face is laser scribed to allow resistance trimming to match available trigger voltage signals and to reduce electrical aging. 14 figs.

Boettcher, G.E.

1998-04-14T23:59:59.000Z

67

Large Diameter Lasing Tube Cooling Arrangement  

DOE Patents (OSTI)

A cooling structure (16) for use inside a ceramic cylindrical tube (11) of a metal vapor laser (10) to cool the plasma in the tube (11), the cooling structure (16) comprising a plurality of circular metal members (17,31) and mounting members (18, 34) that position the metal members (17,31) coaxially in the tube (11) to form an annular lasing volume, with the metal members (17, 31) being axially spaced from each other along the length of the tube (11) to prevent the metal members from shorting out the current flow through the plasma in the tube (11) and to provide spaces through which the heat from localized hot spots in the plasma may radiate to the other side of the tube (11).

Hall, Jerome P.; Alger, Terry W.; Anderson, Andrew T.; Arnold, Philip A.

2004-05-18T23:59:59.000Z

68

Tube support grid and spacer therefor  

DOE Patents (OSTI)

A tube support grid and spacers therefor provide radially inward preloading of heat exchange tubes to minimize stress upon base welds due to differential thermal expansion. The grid comprises a concentric series of rings and spacers with opposing concave sides for conforming to the tubes and V-shaped ends to provide resilient flexibility. The flexibility aids in assembly and in transmitting seismic vibrations from the tubes to a shroud. The tube support grid may be assembled in place to achieve the desired inwardly radial preloading of the heat exchange tubes. Tab and slot assembly further minimizes stresses in the system. The radii of the grid rings may be preselected to effect the desired radially inward preloading.

Ringsmuth, Richard J. (Solano Beach, CA); Kaufman, Jay S. (Del Mar, CA)

1986-01-01T23:59:59.000Z

69

Sampling artifacts from conductive silicone tubing  

NLE Websites -- All DOE Office Websites (Extended Search)

Sampling artifacts from conductive silicone tubing Sampling artifacts from conductive silicone tubing Title Sampling artifacts from conductive silicone tubing Publication Type Journal Article Year of Publication 2009 Authors Timko, Michael T., Zhenhong Yu, Jesse Kroll, John T. Jayne, Douglas R. Worsnop, Richard C. Miake-Lye, Timothy B. Onasch, David Liscinsky, Thomas W. Kirchstetter, Hugo Destaillats, Amara L. Holder, Jared D. Smith, and Kevin R. Wilson Journal Aerosol Science and Technology Volume 43 Issue 9 Pagination 855-865 Date Published 06/03/2009 Abstract We report evidence that carbon impregnated conductive silicone tubing used in aerosol sampling systems can introduce two types of experimental artifacts: (1) silicon tubing dynamically absorbs carbon dioxide gas, requiring greater than 5 minutes to reach equilibrium and (2) silicone tubing emits organic contaminants containing siloxane that are adsorbed onto particles traveling through it and onto downstream quartz fiber filters. The consequence can be substantial for engine exhaust measurements as both artifacts directly impact calculations of particulate mass-based emission indices. The emission of contaminants from the silicone tubing can result in overestimation of organic particle mass concentrations based on real-time aerosol mass spectrometry and the off-line thermal analysis of quartz filters. The adsorption of siloxane contaminants can affect the surface properties of aerosol particles; we observed a marked reduction in the water-affinity of soot particles passed through conductive silicone tubing. These combined observations suggest that the silicone tubing artifacts may have wide consequence for the aerosol community and the tubing should, therefore, be used with caution. Contamination associated with the use of silicone tubing was observed at ambient temperature and, in some cases, was enhanced by mild heating (<70°C) or pre-exposure to a solvent (methanol). Further evaluation is warranted to quantify systematically how the contamination responds to variations in system temperature, physicochemical particle properties, exposure to solvent, sample contact time, tubing age, and sample flow rates.

70

Literature search for ceramic vacuum tubes  

DOE Green Energy (OSTI)

The NTIS and Engineering Index files were searched for citations relating to Ceramic and/or Metal Electron Tubes and High Temperature Electronics. A total of 24 citations were found relating directly to ceramic tubes and 24 to high temperature electronics. A search for electron tubes in general was examined for high temperature applications and 39 were obtained. Computer printouts of the abstracts are included in appendices. (MHR)

Cannon, W.

1977-01-12T23:59:59.000Z

71

Reducing gain shifts in photomultiplier tubes  

SciTech Connect

A means is provided for reducing gain shifts in multiplier tubes due to varying event count rates. It includes means for limiting the number of cascaded, active dynodes of the multiplier tube to a predetermined number with the last of predetermined number of dynodes being the output terminal of the tube. This output is applied to an amplifier to make up for the gain sacrificed by not totally utilizing all available active stages of the tube. Further reduction is obtained by illuminating the predetermined number of dynodes with a light source of such intensity that noise appearing at the output dynode associated with the illumination is negligible.

Cohn, Charles E. (Clarendon Hills, IL)

1976-01-01T23:59:59.000Z

72

Carbon Nano Tubes (CNT) / Aragonite Precipitated Calcium ...  

Science Conference Proceedings (OSTI)

Presentation Title, Carbon Nano Tubes (CNT) / Aragonite Precipitated Calcium ... Porous Rare-Earth Containing NbTiAl-Based High-entropy Materials Used for...

73

Condenser Tube Failures: Theory and Practice  

Science Conference Proceedings (OSTI)

This report summarizes information on all aspects of condenser tube failure (CTF) including failure mechanisms, possible root causes, and corrective actions.

2005-12-19T23:59:59.000Z

74

GEIGER-MULLER TYPE COUNTER TUBE  

DOE Patents (OSTI)

A single counter tube capable of responding to a wide range of intensities is described. The counter tube comprises a tubular cathode and an anode extending centrally of the cathode. The spacing between the outer surface of the anode and the inner surface of the cathode is varied along the length of the tube to provide different counting volumes in adjacent portions of the tube. A large counting volume in one portion adjacent to a low-energy absorption window gives adequate sensitivity for measuring lowintensity radiation, while a smaller volume with close electrode spacing is provided in the counter to make possible measurement of intense garnma radiation fields.

Fowler, I.L.; Watt, L.A.K.

1959-12-15T23:59:59.000Z

75

Carbon NanoTube Digital Electronics Workshop  

Science Conference Proceedings (OSTI)

Carbon NanoTube Digital Electronics Workshop. Purpose: To review and discuss the current status and potential benefits of carbon nanotubes in ...

2012-08-29T23:59:59.000Z

76

Pool boiling of R-114/oil mixtures from single tubes and tube bundles. Master's thesis  

Science Conference Proceedings (OSTI)

An apparatus was designed, fabricated, and operated for the testing of horizontal tube bundles for boiling of R-114 with various concentrations of oil. Preliminary data were taken on the top tube in the bundle, with and without the other tubes in operation. Results showed up to a 37% increase in the boiling heat-transfer coefficient as a result of the favorable bundle effect. In a separate single-tube apparatus, three enhanced tubes were tested at a saturation temperature of 2.2 C with oil mass concentrations of 0, 1, 2, 3, 6 and 10%. The tubes were: 1) a finned tube with 1024 fins per meter, 2) a finned tube with 1575 fins per meter and 3) a Turbo-B tube. These tubes resulted in enhancement ratios in pure refrigerant of 2.8, 3.8 and 5.2, respectively, at a practical heat flux of 30 kW/sq. meter. With 3% oil, these ratios were decreased to 2.6, 3.5 and 5, while with 10% oil, these ratios were further reduced to 2.6, 3.2 and 4.7, respectively. Based on these results, the use of Turbo-B tubes is expected to result in significant savings in weight and size of evaporators over the finned tubes presently in use on board some naval vessels.

Murphy, T.J.

1987-09-01T23:59:59.000Z

77

Raft River condenser-tube examination  

DOE Green Energy (OSTI)

In the program of development of a water treatment for the 5 MW Raft River power plants' carbon steel heat rejection system, four carbon steel tubes were analyzed in this batch. The results of visual and scanning electron microscope examination of the tubes are presented. (MHR)

Suciu, D.F.

1981-04-03T23:59:59.000Z

78

Ultra-fast framing camera tube  

DOE Patents (OSTI)

An electronic framing camera tube features focal plane image dissection and synchronized restoration of the dissected electron line images to form two-dimensional framed images. Ultra-fast framing is performed by first streaking a two-dimensional electron image across a narrow slit, thereby dissecting the two-dimensional electron image into sequential electron line images. The dissected electron line images are then restored into a framed image by a restorer deflector operated synchronously with the dissector deflector. The number of framed images on the tube's viewing screen is equal to the number of dissecting slits in the tube. The distinguishing features of this ultra-fast framing camera tube are the focal plane dissecting slits, and the synchronously-operated restorer deflector which restores the dissected electron line images into a two-dimensional framed image. The framing camera tube can produce image frames having high spatial resolution of optical events in the sub-100 picosecond range.

Kalibjian, Ralph (1051 Batavia Ave., Livermore, CA 94550)

1981-01-01T23:59:59.000Z

79

Coiled tubing flowline cuts wetlands disturbance  

Science Conference Proceedings (OSTI)

Operators in environmentally sensitive wetland areas of South Louisiana have used jointed, or stickpipe flowlines to transmit oil and gas to and from wellsites and production facilities. Recently, a new method featuring coiled tubing was introduced, using it as a recyclable gas flowline. The coiled tubing method eliminates potential environmental damage that could occur when stickpipe is used and it allows the tubing to be easily recovered and reused when the well is taken out of service. This article describes economic advantages of using coiled tubing and how its use simplified environmental constraints encountered in swamps. It is an expanded version of the authors` presentation to World Oil`s Coiled Tubing Conference, Houston, March, 1993.

Coats, E.A. [Halliburton Services, New Orleans, LA (United States); Marinello, S.A. [Colorado School of Mines, Golden, CO (United States)

1993-12-01T23:59:59.000Z

80

OXIDE DISPERSION-STRENGTHENED HEAT EXCHANGER TUBING  

Science Conference Proceedings (OSTI)

Oxide dispersion strengthened (ODS) alloys (e.g. the INCOLOY{reg_sign} MA956 alloy) are known for their excellent high temperature properties and are prime candidate materials for the construction of very high temperature heat exchangers that will be used in Vision 21 power plants. The main limitation of these materials is their poor weldability. Commercially available ODS tubing also tends to exhibit relatively poor circumferential creep strength due to current processing practices resulting in a fine grain size in the transverse direction. Thus far, these two characteristics of the ODS tubing have restricted its use to mostly non-pressure containing applications. The objectives of this program are to develop: (a) an MA956 tube with sufficient circumferential creep strength for long term use as heat exchanger tubing for very high temperatures; (b) a welding technique(s) for producing adequate joints between an MA956 tube and an MA956 tube, and an MA956 tube and an INCONEL 601 tube; (c) the bending strain limits, below which recrystallization will not occur in a MA956 tube during normal operation; and (d) the high temperature corrosion limits for the MA956 alloy with respect to working-fluid side and fireside environments. Also, this program seeks to generate data for use by heat exchanger designers and the ASME Boiler and Pressure Vessel Code, and perform an analysis of the mechanical property, tube bending, and corrosion data in order to determine the implications on the design of a very high temperature heat exchanger (T>1093 C/2000 F). After one year, work is currently being conducted on increasing the circumferential strength of a MA956 tube, developing joining techniques for this material, determining the tube bending strain limits, and establishing the high temperature corrosion parameters for the MA956 alloy in environments expected to be present in Vision 21 power plants. Work in these areas will is continuing into the next fiscal year, with success anticipated to produce innovative developments that will allow the reliable use of ODS alloys for heat exchanger tubing, as well as a variety of applications previously not possible with metallic materials.

Harper, Mark A.

2001-11-06T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Nondestructive Evaluation: Electromagnetic NDE for Ferritic and Duplex Tubing  

Science Conference Proceedings (OSTI)

With new and replacement heat exchanger designs incorporating alternative ferritic and duplex stainless steel tubing, inspection techniques must remain current and viable to allow reliable flaw detection and sizing of tubing flaws found in both tube free spans and in the vicinity of tube support plates. To approach this inspection challenge, tube material properties of more common tubing types used in the field, such as Sea-Cure, 439 stainless, and 2205 duplex, were determined. This was followed by ...

2012-11-15T23:59:59.000Z

82

Scintillation probe with photomultiplier tube saturation indicator  

SciTech Connect

A photomultiplier tube saturation indicator is formed by supplying a supplemental light source, typically an light emitting diode (LED), adjacent to the photomultiplier tube. A switch allows the light source to be activated. The light is forwarded to the photomultiplier tube by an optical fiber. If the probe is properly light tight, then a meter attached to the indicator will register the light from the LED. If the probe is no longer light tight, and the saturation indicator is saturated, no signal will be registered when the LED is activated. 2 figs.

Ruch, J.F.; Urban, D.J.

1996-10-01T23:59:59.000Z

83

On the history of photomultiplier tube invention  

E-Print Network (OSTI)

In this very short note we review some historical aspects of photomultiplier tube invention. It is our tribute to the memory of great Soviet-Russian physicist and engineer Leonid Aleksandrovitch Kubetsky whose life and scientific achievements are described briefly. Particular efforts are made to shed light on a controversial issue of who invented the first photomultiplier tube. It is asserted that if to recognize L.A.Kubetsky's priority on the photomultiplier tube invention the last Beaune Conference would be held on the eve of the 75th Anniversary of that great event.

B. K. Lubsandorzhiev

2006-01-20T23:59:59.000Z

84

Coiled tubing facilitates deep underbalanced workover  

Science Conference Proceedings (OSTI)

A recent workover shows the technical capability and cost effectiveness of coiled tubing for cleaning out scale in a 22,611-ft, low pressure, high-temperature gas well. The well, operated by Chevron USA Production Co., is in the Fort Stockton Gas Unit 5-1 Gomez (Ellenburger) field, in West Texas. The development of reliable 100,000-psi minimal yield strength coiled tubing was a major factor that allowed this work to succeed. The methods demonstrated by this workover are becoming a standard for deep well cleanouts in the Gomez (Ellenburger) field. The paper describes coiled tubing advantages, well history, and implementation.

Adams, L.S. [Chevron USA Production Co., Midland, TX (United States); Overstreet, C.C. [CUDD Pressure Control Inc., Houston, TX (United States)

1997-03-31T23:59:59.000Z

85

Scintillation probe with photomultiplier tube saturation indicator  

DOE Patents (OSTI)

A photomultiplier tube saturation indicator is formed by supplying a supplemental light source, typically an light emitting diode (LED), adjacent to the photomultiplier tube. A switch allows the light source to be activated. The light is forwarded to the photomultiplier tube by an optical fiber. If the probe is properly light tight, then a meter attached to the indicator will register the light from the LED. If the probe is no longer light tight, and the saturation indicator is saturated, no signal will be registered when the LED is activated.

Ruch, Jeffrey F. (Bethel Park, PA); Urban, David J. (Glassport, PA)

1996-01-01T23:59:59.000Z

86

Starter for inductively coupled plasma tube  

DOE Patents (OSTI)

A starter assembly is provided for use with an inductively coupled plasma (ICP) tube to reliably initiate a plasma at internal pressures above about 30 microns. A conductive probe is inserted within the inductor coil about the tube and insulated from the tube shield assembly. A capacitive circuit is arranged for momentarily connecting a high voltage radio-frequency generator to the probe while simultaneously energizing the coil. When the plasma is initiated the probe is disconnected from the generator and electrically connected to the shield assembly for operation. 1 fig.

Hull, D.E.; Bieniewski, T.M.

1988-08-23T23:59:59.000Z

87

Starter for inductively coupled plasma tube  

DOE Patents (OSTI)

A starter assembly is provided for use with an inductively coupled plasma (ICP) tube to reliably initate a plasma at internal pressures above about 30 microns. A conductive probe is inserted within the inductor coil about the tube and insulated from the tube shield assembly. A capacitive circuit is arranged for momentarily connecting a high voltage radio-frequency generator to the probe while simultaneously energizing the coil. When the plasma is initiated the probe is disconnected from the generator and electrically connected to the shield assembly for operation.

Hull, Donald E. (969 Nambe Loop, Los Alamos, NM 87544); Bieniewski, Thomas M. (285 Donna Ave., Los Alamos, NM 87544)

1988-01-01T23:59:59.000Z

88

Gastrostomy Tube Placement Without Nasogastric Tube: A Retrospective Evaluation in 85 Patients  

SciTech Connect

Purpose: Our study evaluated techniques for percutaneous gastrostomy (G)-tube placement without the use of a nasogastric (NG) tube. Instead, direct puncture of a physiologic air bubble or effervescent-enhanced gastric bubble distention was performed in patients with upper digestive tract obstruction (UDTO) or psychological objections to NG tubes. Materials and Methods: A total of 886 patients underwent G-tube placement in our department during a period of 7 years. We present our series of 85 (9.6%) consecutive patients who underwent percutaneous G-tube placement without use of an NG tube. Results: Of these 85 patients, fluoroscopic guided access was attempted by direct puncture of a physiologically present gastric air bubble in 24 (28%) cases. Puncture of an effervescent-induced large gastric air bubble was performed in 61 (72%) patients. Altogether, 82 (97%) of 85 G tubes were successfully placed in this fashion. The three failures comprised refusal of effervescent, vomiting of effervescent, and one initial tube misplacement when a deviation from our standard technique occurred. Conclusion: The described techniques compare favorably with published large series on G-tube placement with an NG tube in place. The techniques are especially suited for patients with UDTO due to head, neck, or esophageal malignancies, but they should be considered as an alternative in all patients. Direct puncture of effervescent-enhanced gastric bubble distention is a safe, patient-friendly and effective technique.

Heberlein, Wolf E., E-mail: weheberlein@uams.edu; Goodwin, Whitney J.; Wood, Clint E.; Yousaf, Muhammad; Culp, William C. [University of Arkansas for Medical Sciences, Department of Radiology (United States)

2012-12-15T23:59:59.000Z

89

Suction muffler for refrigeration compressor  

SciTech Connect

A hermetic refrigeration compressor includes a suction muffler formed from two pieces of plastic material mounted on the cylinder housing. One piece is cylindrical in shape with an end wall having an aperture for receiving a suction tube connected to the cylinder head. The other piece fits over and covers the other end of the cylindrical piece, and includes a flaring entrance horn which extends toward the return line on the sidewall of the compressor shell.

Nelson, Richard T. (Worthington, OH); Middleton, Marc G. (West Jefferson, OH)

1983-01-01T23:59:59.000Z

90

Suction muffler for refrigeration compressor  

DOE Patents (OSTI)

A hermetic refrigeration compressor includes a suction muffler formed from two pieces of plastic material mounted on the cylinder housing. One piece is cylindrical in shape with an end wall having an aperture for receiving a suction tube connected to the cylinder head. The other piece fits over and covers the other end of the cylindrical piece, and includes a flaring entrance horn which extends toward the return line on the sidewall of the compressor shell. 5 figs.

Nelson, R.T.; Middleton, M.G.

1983-01-25T23:59:59.000Z

91

Forced-convection condensation inside tubes  

E-Print Network (OSTI)

High vapor velocity condensation inside a tube was studied analytically. The von Karman universal velocity distribution was applied to the condensate flow, pressure drops were calculated using the Lockhart- Martinelli ...

Traviss, Donald P.

1971-01-01T23:59:59.000Z

92

Sample inlet tube for ion source  

DOE Patents (OSTI)

An improved inlet tube is positioned within an aperture through the device to allow the passage of ions from the ion source, through the improved inlet tube, and into the interior of the device. The inlet tube is designed with a larger end and a smaller end wherein the larger end has a larger interior diameter than the interior diameter of the smaller end. The inlet tube is positioned within the aperture such that the larger end is pointed towards the ion source, to receive ions therefrom, and the smaller end is directed towards the interior of the device, to deliver the ions thereto. Preferably, the ion source utilized in the operation of the present invention is a standard electrospray ionization source. Similarly, the present invention finds particular utility in conjunction with analytical devices such as mass spectrometers.

Prior, David [Hermiston, OR; Price, John [Richland, WA; Bruce, Jim [Oceanside, CA

2002-09-24T23:59:59.000Z

93

Frictional forces in helical buckling of tubing  

SciTech Connect

Previous analyses of helical buckling of tubing have not considered frictional forces. This paper describes the modifications to helical buckling theory necessary to include friction. The first need is a relationship between the buckling force and the casing to tubing contact force. This contact force is determined through use of the principle of virtual work. The next need is the relationship between the friction forces, the buckling force, and the geometry of the tubing helix. Differential equations are derived and solved for two cases of interest: buckling during the landing of the tubing and thermal and differential pressure loading subsequent to landing. Several example problems are examined to evaluate the relative importance of friction.

Mitchell, R.F.

1984-09-01T23:59:59.000Z

94

2173333115 A DESIGN MODEL FOR CAPILLARY TUBE-SUCTION  

E-Print Network (OSTI)

Center was founded in 1988 with a grant from the estate of Richard W. Kritzer, the founder of Peerless of America Inc. A State of Illinois Technology Challenge Grant helped build the laboratory facilities. The ACRC receives continuing support from the Richard W. Kritzer Endowment and the National Science Foundation. Thefollowing organizations have also become sponsors of the Center. Acustar Division of Chrysler Allied-Signal, Inc.

R. A. Peixoto; C. W. Bullard; Air Conditioning; C. W. Bullard; Principal Investigator; The Air Conditioning; Carrier Corporation; U. S. Anny Cerl; R. A. Peixoto; C. W. Bullard

1994-01-01T23:59:59.000Z

95

Experiments on the Rijke?Tube Phenomenon  

Science Conference Proceedings (OSTI)

Experimental investigations of the Rijke?tube phenomenon have used the same basic apparatus as that used by its discoverer in 1859an open?ended vertical pipe containing a heated gauze in its lower half. Difficulties arise when this configuration is used for quantitative tests since the standing?wave distributions of the tube and its environment interact unless elaborate precautions are taken; consequently

Melvin M. Friedlander; T. J. B. Smith; Alan Powell

1964-01-01T23:59:59.000Z

96

Electric Flux Tube in Magnetic Plasma  

E-Print Network (OSTI)

In this paper we study a methodical problem related to the magnetic scenario recently suggested and initiated by the authors \\cite{Liao_ES_mono} to understand the strongly coupled quark-gluon plasma (sQGP): the electric flux tube in monopole plasma. A macroscopic approach, interpolating between Bose condensed (dual superconductor) and classical gas medium is developed first. Then we work out a microscopic approach based on detailed quantum mechanical calculation of the monopole scattering on electric flux tube, evaluating induced currents for all partial waves. As expected, the flux tube looses its stability when particles can penetrate it: we make this condition precise by calculating the critical value for the product of the flux tube size times the particle momentum, above which the flux tube dissolves. Lattice static potentials indicate that flux tubes seem to dissolve at $T>T_{dissolution} \\approx 1.3 T_c$. Using our criterion one gets an estimate of the magnetic density $n\\approx 4.4 \\sim 6.6 fm^{-3}$ a...

Liao Jin Feng

2007-01-01T23:59:59.000Z

97

Condensation of refrigerants on vertical fluted tubes  

DOE Green Energy (OSTI)

Experiments were run to determine heat transfer performance of single vertical fluted tubes with selected fluids condensing on the outside. Working fluids included six fluorocarbons (Refrigerants 11, 21, 22, 113, 114, and 115) and a hydrocarbon (Refrigerant 600a or isobutane). The nine test tubes were of 2.54-cm (1-in.) nominal outside diameter and 1.2 m (4 ft) in length with from 0 (smooth) to 60 axial flutes. Condensing heat transfer coefficients ranged from 620 to 7900 W/m/sup 2/ . K (110 to 1400 Btu/hr . ft/sup 2/ . /sup 0/F) over the heat flux range of 2000 to 43,000 W/m/sup 2/ (920 to 13,600 Btu/hr . ft/sup 2/). All parameters are based on total condensing surface area. The data show that, for a given heat flux, a fluted tube can increase condensing coefficients up to 6.0 times smooth tube values. Further heat transfer enhancement was achieved by the use of drainage skirts on fluted tubes; these skirts effectively divided the 1.2-m (4-ft) tubes into two, four, and eight equal condensing lengths.

Combs, S.K.; Mailen, G.S.; Murphy, R.W.

1978-08-01T23:59:59.000Z

98

The Design of an Inspection Robot for Boiler Tubes Inspection  

Science Conference Proceedings (OSTI)

A climbing robot with magnetic wheels is designed for the inspection of boiler tubes in fossil power plants, which can inspect the boiler tubes automatically. The climbing robot will move on the boiler tubes. The magnetic wheels of the robot can be move ... Keywords: boiler tubes, climbing robot, magnetic flux leakage sensor, VSC controller

Lu Xueqin; Qiu Rongfu; Liu Gang; Huang Fuzhen

2009-11-01T23:59:59.000Z

99

Examination of Kewaunee Cold Leg Steam Generator Tubes  

Science Conference Proceedings (OSTI)

Destructive and non-destructive examination of three cold leg tubes removed from Kewaunee steam generator B in 1993 revealed 18 percent-29 percent throughwall intergranular degradation in tube support crevice regions, but burst pressures were nearly the same as for non-degraded tubes. Deposit and oxide film analyses suggest that alkaline conditions existed in tube support crevice regions.

1994-07-15T23:59:59.000Z

100

Characterization of Ringhals 3 Tube Support Plate Crevice and Tube Deposits  

Science Conference Proceedings (OSTI)

This report presents the results of a series of examinations of two tube support plate (TSP)/tube intersections from a retired Ringhals 3 steam generator. The study, which involved both nondestructive and destructive examination, yielded valuable information on TSP corrosion and crevice deposits, which will support better understanding of secondary side degradation in steam generators.

1999-03-23T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Proceedings: International Conference on Boiler Tube and HRSG Tube Failures and Inspections  

Science Conference Proceedings (OSTI)

Tube failures are the leading cause of availability loss in conventional fossil plants and combined cycle/heat recovery steam generator (HRSG) plants. This conference proceedings addresses worldwide state-of-the-art practices and techniques for understanding and reducing tube failures.

2006-08-29T23:59:59.000Z

102

Design and evaluate finned tube bundles  

Science Conference Proceedings (OSTI)

Finned tube bundles are widely used in heat exchangers, air coolers, waste heat boilers and fired heaters where energy transfer occurs between clean flue gases and a fluid with a high heat-transfer coefficient. They have several advantages including compactness, low gas pressure drop and low weight for a given duty compared to bare tube bundles. Choosing a fin type, arrangement and fin configuration requires a thorough analysis and economic evaluation. The solution is not unique since it depends on material and labor costs. Surface areas vary widely in finned tube designs for the same duty and gas pressure drop. Therefore, decisions should not be based on surface area alone. Plant engineers and consultants should consider operating costs in their evaluation because they accrue year after year. Selecting a boiler based on initial costs alone is not prudent. The paper discusses heat transfer and gas pressure drop with finned tubes, determining fin efficiency and effectiveness,g as pressure drop, tube wall and fin top temperatures, an example calculation, the effect of fin configuration on design, the effect of inline versus staggered arrangements and solid versus serrated fins, and concerns with high fin-density designs.

Ganapathy, V. [ABCO Industries, Abilene, TX (United States)

1996-09-01T23:59:59.000Z

103

Power Tube Inc | Open Energy Information  

Open Energy Info (EERE)

Power Tube Inc Power Tube Inc Jump to: navigation, search Name Power Tube Inc Place Houston, Texas Zip 77060 Sector Geothermal energy Product Texan geothermal systems developer. Has developed a new range of geothermal heat exchangers from biodegradable materials. Coordinates 29.76045°, -95.369784° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":29.76045,"lon":-95.369784,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

104

Alternate Materials for Recovery Boiler Superheater Tubes  

SciTech Connect

The ever escalating demands for increased efficiency of all types of boilers would most sensibly be realized by an increase in the steam parameters of temperature and pressure. However, materials and corrosion limitations in the steam generating components, particularly the superheater tubes, present major obstacles to boiler designers in achieving systems that can operate under the more severe conditions. This paper will address the issues associated with superheater tube selection for many types of boilers; particularly chemical recovery boilers, but also addressing the similarities in issues for biomass and coal fired boilers. It will also review our recent study of materials for recovery boiler superheaters. Additional, more extensive studies, both laboratory and field, are needed to gain a better understanding of the variables that affect superheater tube corrosion and to better determine the best means to control this corrosion to ultimately permit operation of recovery boilers at higher temperatures and pressures.

Keiser, James R [ORNL; Kish, Joseph [McMaster University; Singbeil, Douglas [FPInnovations

2009-01-01T23:59:59.000Z

105

Circumferential cracking of steam generator tubes  

SciTech Connect

On April 28, 1995, the U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 95-03, {open_quote}Circumferential Cracking of Steam Generator Tubes.{close_quote} GL 95-03 was issued to obtain information needed to verify licensee compliance with existing regulatory requirements regarding the integrity of steam generator tubes in domestic pressurized-water reactors (PWRs). This report briefly describes the design and function of domestic steam generators and summarizes the staff`s assessment of the responses to GL 95-03. The report concludes with several observations related to steam generator operating experience. This report is intended to be representative of significant operating experience pertaining to circumferential cracking of steam generator tubes from April 1995 through December 1996. Operating experience prior to April 1995 is discussed throughout the report, as necessary, for completeness.

Karwoski, K.J.

1997-04-01T23:59:59.000Z

106

An explosively driven, fast shock tube  

SciTech Connect

A simple, cylindrically configured fast shock tube (FST) has been employed as a tool to investigate the hydrodynamics of plate drive under a very high impulse-loading condition. The shock tube has a high-explosive outer shell and a low-density foam core. The implosion produces a well-defined Mach disk that is then subsequently used to drive a metallic plate. A thin stainless steel (SS) plate has been successfully launched to 9 km/s with this device. The experimental results from the study of material flow will be presented and compared with numerical calculation. Various interesting measurement techniques will also be discussed.

Tan, T.H.; Marsh, S.

1992-03-01T23:59:59.000Z

107

An explosively driven, fast shock tube  

SciTech Connect

A simple, cylindrically configured fast shock tube (FST) has been employed as a tool to investigate the hydrodynamics of plate drive under a very high impulse-loading condition. The shock tube has a high-explosive outer shell and a low-density foam core. The implosion produces a well-defined Mach disk that is then subsequently used to drive a metallic plate. A thin stainless steel (SS) plate has been successfully launched to 9 km/s with this device. The experimental results from the study of material flow will be presented and compared with numerical calculation. Various interesting measurement techniques will also be discussed.

Tan, T.H.; Marsh, S.

1992-01-01T23:59:59.000Z

108

Segmented instrumentation tube including a locking sleeve for interlocking the segments of the instrumentation tube  

DOE Patents (OSTI)

Segmented instrumentation tube including a locking sleeve for interlocking the segments of the instrumentation tube, so that the threaded ends of the instrumentation tube do not unthread when subjected to vibration, such an instrumentation tube being suitable for use in a nuclear reactor pressure vessel. The instrumentation tube has a first member having a threaded end portion that has a plurality of first holes circumferentially around the outside surface thereof. The instrumentation tube also has a second member having a threaded end portion that has a plurality of second holes circumferentially around the outside surface thereof. The threads of the second member are caused to threadably engage the threads of the first member for defining a threaded joint therebetween. A sleeve having an inside surface surrounds the end portion of the first member and the end portion of the second member and thus surrounds the threaded joint. The sleeve includes a plurality of first projections and second projections that outwardly extend from the inside surface to engage the first holes and the second holes, respectively. The outside surface of the sleeve is crimped or swaged at the locations of the first projections and second projections such that the first projections and the second projections engage their respective holes. In this manner, independent rotation of the first member with respect to the second member is prevented, so that the instrumentation tube will not unthread at its threaded joint.

Obermeyer, Franklin D. (Pensacola, FL)

1993-01-01T23:59:59.000Z

109

Segmented instrumentation tube including a locking sleeve for interlocking the segments of the instrumentation tube  

DOE Patents (OSTI)

Segmented instrumentation tube including a locking sleeve for interlocking the segments of the instrumentation tube, so that the threaded ends of the instrumentation tube do not unthread when subjected to vibration, such an instrumentation tube being suitable for use in a nuclear reactor pressure vessel. The instrumentation tube has a first member having a threaded end portion that has a plurality of first holes circumferentially around the outside surface thereof. The instrumentation tube also has a second member having a threaded end portion that has a plurality of second holes circumferentially around the outside surface thereof. The threads of the second member are caused to threadably engage the threads of the first member for defining a threaded joint there between. A sleeve having an inside surface surrounds the end portion of the first member and the end portion of the second member and thus surrounds the threaded joint. The sleeve includes a plurality of first projections and second projections that outwardly extend from the inside surface to engage the first holes and the second holes, respectively. The outside surface of the sleeve is crimped or swaged at the locations of the first projections and second projections such that the first projections and the second projections engage their respective holes. In this manner, independent rotation of the first member with respect to the second member is prevented, so that the instrumentation tube will not unthread at its threaded joint. 10 figures.

Obermeyer, F.D.

1993-11-16T23:59:59.000Z

110

NDE for Carbon Steel Heat Exchanger Tube Support Plates and Tube Fretting  

Science Conference Proceedings (OSTI)

Remote field, near field, magnetically biased eddy current, and flux leakage examination are invaluable nondestructive evaluation (NDE) methods that are used extensively to investigate integrity of ferromagnetic tubing found in heat exchangers, boilers, and moisture separator reheaters (MSR), to name a few components. Tube dimensions ranging from 0.625" (15.875mm) up to 4.00" (10.16cm) in diameter x 0.065" (1.65mm) up to 0.120" (3.04mm) wall thickness can be readily interrogated for tubing free-span degr...

2005-03-31T23:59:59.000Z

111

A method and apparatus for tube crevice detection and measurement  

DOE Patents (OSTI)

This invention relates to a method and apparatus for determining the extent of contact between an electrically conducting tube and an electrically conductive tubesheet surrounding the tube, based upon the electrical resistance of the tube and tubesheet. A constant current source is applied to the interior of the electrically conducting tube by probes and a voltmeter is connected between other probes to measure the voltage at the point of current injection, which is inversely proportional to the amount of contact between the tube and tubesheet. Namely, the higher the voltage measured by the voltmeter, the less contact between the tube and tubesheet.

Kikta, T.J.; Mitchell, R.D.

1991-01-01T23:59:59.000Z

112

Boiler Tube Internal Oxide Scale Thickness Measurement: Best Practices  

Science Conference Proceedings (OSTI)

Long-term high-temperature exposure of reheater and superheater tubes in fossil-fired steam boilers results in the growth of iron oxide scale (magnetite) on the inner tube surface. This internal oxide layer on the water side of the tube acts as a thermal insulator, reducing heat transfer through the tube wall into the internal water vapor. Over time, this insulating effect limits heat transmission into the water vapor inside the tube, which, in turn, causes chronic overheating of the tube wall. The ...

2013-12-20T23:59:59.000Z

113

Workshop Proceedings: Pitting in Steam Generator Tubing  

Science Conference Proceedings (OSTI)

A two-day workshop focused on the probable causes of steam generator pitting at two nuclear plants and on whether pitting is a low-temperature or a high-temperature phenomenon. Participants also heard descriptions of various pit-resistant metals that are suitable for tube sleeving.

1984-10-01T23:59:59.000Z

114

"Fine grain Nb tube for SRF cavities"  

SciTech Connect

Superconducting radio frequency (SRF) cavities used in charged particle linear accelerators, are currently fabricated by deep drawing niobium sheets and welding the drawn dishes together. The Nb sheet has a non-uniform microstructure, which leads to unpredictable cavity shape and surface roughness, and inconsistent "spring-back" during forming. In addition, weld zones cause hot spots during cavity operation. These factors limit linear accelerator performance and increase cavity manufacturing cost. Equal channel angular extrusion (ECAE) can be used to refine and homogenize the microstructure of Nb tube for subsequent hydroforming into SRF cavities. Careful selection of deformation and heat treatment conditions during the processing steps can give a uniform and consistent microstructure in the tube, leading to improved deformability and lower manufacturing costs. Favorable microstructures were achieved in short test samples of RRR Nb tube, which may be particularly suitable for hydroforming into SRF cavity strings. The approach demonstrated could be applicable to microstructure engineering of other tube materials including tantalum, titanium, and zirconium.

Robert E. Barber

2012-07-08T23:59:59.000Z

115

Stress-Assisted Corrosion in Boiler Tubes  

Science Conference Proceedings (OSTI)

A number of industrial boilers, including in the pulp and paper industry, needed to replace their lower furnace tubes or decommission many recovery boilers due to stress-assisted corrosion (SAC) on the waterside of boiler tubes. More than half of the power and recovery boilers that have been inspected reveal SAC damage, which portends significant energy and economic impacts. The goal of this project was to clarify the mechanism of stress-assisted corrosion (SAC) of boiler tubes for the purpose of determining key parameters in its mitigation and control. To accomplish this in-situ strain measurements on boiler tubes were made. Boiler water environment was simulated in the laboratory and effects of water chemistry on SAC initiation and growth were evaluated in terms of industrial operations. Results from this project have shown that the dissolved oxygen is single most important factor in SAC initiation on carbon steel samples. Control of dissolved oxygen can be used to mitigate SAC in industrial boilers. Results have also shown that sharp corrosion fatigue and bulbous SAC cracks have similar mechanism but the morphology is different due to availability of oxygen during boiler shutdown conditions. Results are described in the final technical report.

Preet M Singh; Steven J Pawel

2006-05-27T23:59:59.000Z

116

Digital radiographic systems detect boiler tube cracks  

SciTech Connect

Boiler water wall leaks have been a major cause of steam plant forced outages. But conventional nondestructive evaluation techniques have a poor track record of detecting corrosion fatigue cracking on the inside surface of the cold side of waterwall tubing. EPRI is performing field trials of a prototype direct-digital radiographic system that promises to be a game changer. 8 figs.

Walker, S. [EPRI, Charlotte, NC (United States)

2008-06-15T23:59:59.000Z

117

Transient natural convection in heated inclined tubes  

SciTech Connect

To simulate natural convection flow patterns in directionally drilled wellbores, experiments and analyses were conducted for a circular tube with length-to-diameter (L/D) ratio of 36 at angles of 0{degree}, 20{degree}, and 35{degree} from the vertical. The tube was heated at the bottom and cooled at the top, and the insulation was adjusted so that approximately one- to two-thirds of the power dissipated was transferred through the tube wall to the surroundings. An aqueous solution of polyvinyl alcohol was employed as the working fluid in order to obtain low Rayleigh numbers corresponding to conditions in geothermal wellbores. Results were primarily qualitative but were useful in providing insight into the phenomena occurring. Steady-state temperature distributions were measured for the three orientations and for several heating rates to demonstrate the effects of tube angle and Rayleigh number. transient measurements of the temperature distribution were obtained during cooling from a higher temperature without a heat source to calibrate the heat losses. With the electrical heat source, temporal data were taken during heating to examine the approach to steady state. Quasi-steady flow conditions were approached rapidly, but the overall time constant of the apparatus was of the order of one-third of a day. Predictions with the three-dimensional TEMPEST code were first tested by comparison with simple conduction analyses. Comparison with actual data showed good agreement of the predicted temperature levels for the maximum inclination, 35{degree}, and slightly poorer agreement for the other limit, a vertical tube. Trends of temperature level and Nusselt number with heating rate or Rayleigh number were reasonable, but the predicted variation of the end Nusselt number versus inclination was in the opposite direction from the experiment. 75 refs., 20 figs., 8 tabs.

McEligot, D.M. (Westinghouse Electric Corp., Middletown, RI (USA). Oceanic Div.); Denbow, D.A. (Software AG of North America, Inc., Lakewood, CO (USA)); Murphy, H.D. (Los Alamos National Lab., NM (USA))

1990-05-01T23:59:59.000Z

118

Horizontal Beam Tubes - HFIR Technical Parameters | ORNL Neutron Sciences  

NLE Websites -- All DOE Office Websites (Extended Search)

Horizontal Beam Tubes Horizontal Beam Tubes The reactor has four horizontal beam tubes that supply the neutrons to the neutron scattering instruments. Details for each beam tube and instrument can be found on the HFIR instrument page. Each of the beam tubes that supply these instruments with neutrons is described subsequently. HB-1 and HB-3 The HB-1 and HB-3 thermal neutron beam tube designs are identical except for the length. Both are situated tangential to the reactor core so that the tubes point at reflector material and do not point directly at the fuel. An internal collimator is installed at the outboard end. This collimator is fabricated out of carbon steel and is plated with nickel. The collimator provides a 2.75-in by 5.5-in. rectangular aperture. A rotary shutter is located outboard of each of these beam tubes. The

119

EOI, Electric Tube Conversion Furnaces | Y-12 National Security...  

NLE Websites -- All DOE Office Websites (Extended Search)

Tube ... EOI, Electric Tube Conversion Furnaces B&W Y-12, LLC (hereafter known as "Y-12"; for additional company information, see the website), acting under its Prime Contract No....

120

Fouling of HVAC fin and tube heat exchangers  

E-Print Network (OSTI)

air ? air ? part ? part FPI HVAC REFERENCES Anonymous, 1987,LBNL-47668 Fouling of HVAC Fin and Tube Heat ExchangersCIEE SPONSOR. FOULING OF HVAC FIN AND TUBE HEAT EXCHANGERS

Siegel, Jeffrey; Carey, Van P.

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Fouling of HVAC fin and tube heat exchangers  

E-Print Network (OSTI)

Methods to Maintain Heat Exchanger Coil Cleanliness, ASHRAEof HVAC Fin and Tube Heat Exchangers Jeffrey Siegel and VanOF HVAC FIN AND TUBE HEAT EXCHANGERS Jeffrey Siegel 1,2 and

Siegel, Jeffrey; Carey, Van P.

2001-01-01T23:59:59.000Z

122

Refrigerant forced-convection condensation inside horizontal tubes  

E-Print Network (OSTI)

Condensing heat transfer rates inside a horizontal tube were investigated -for large quality changes across the tube. The proposed correlation is a modification of the work of Rohsenow, Webber and Ling [29]. The result of ...

Bae, Soonhoon

1968-01-01T23:59:59.000Z

123

Insulated laser tube structure and method of making same  

DOE Patents (OSTI)

An insulated high temperature ceramic laser tube having substantially uniform insulation along the length of the tube is disclosed having particulate ceramic insulation positioned between the outer wall of the ceramic laser tube and the inner surface of tubular ceramic fiber insulation which surrounds the ceramic laser tube. The particulate ceramic insulation is preferably a ceramic capable of sintering to the outer surface of the ceramic laser tube and to the inner surface of the tubular ceramic fiber insulation. The addition of the particulate ceramic insulation to fill all the voids between the ceramic laser tube and the fibrous ceramic insulation permits the laser tube to be operated at a substantially uniform temperature throughout the length of the laser tube.

Dittbenner, Gerald R. (4353 Findlay Way, Livermore, CA 94550)

1999-01-01T23:59:59.000Z

124

Development of Methods to Repair Header Stub Tube Bends  

Science Conference Proceedings (OSTI)

Repair of flow-accelerated corrosion damage in bent header stub tubes in heat recovery steam generators (HRSGs) is normally accomplished by spreading tubing pendants to gain access, cutting your way in and welding your way out, or plugging damaged tubing. The technology described in this report is being developed to enable the replacement of damaged tubing in a method that will dramatically reduce change-out time in the event of a failure.

2008-12-23T23:59:59.000Z

125

HRSG Repair Welding Technologies to Address FAC in Tube Bends  

Science Conference Proceedings (OSTI)

Tube failures that occur in heat recovery steam generators (HRSGs) are often caused by thermal stress or thermal shock associated with cyclic plant operation or by flow-accelerated corrosion. Many premature failures occur along the length of finned tubes or at attachment locations where tubes are joined to the upper or lower header. Because of current tube repair practices and limited access for welding, reoccurring failures are common.

2008-03-20T23:59:59.000Z

126

Steam Generator Management Program: Alloy 800 Steam Generator Tubing Experience  

Science Conference Proceedings (OSTI)

Nuclear grade (NG) Alloy 800 has been used for steam generator tubing since 1972 in over 50 nuclear power plants worldwide. The operational performance of this alloy has been very good, although some degradation modes have recently been observed. This report describes worldwide operating experience for Alloy 800 steam generator tubing along with differences in tubing material, plant design, and operating conditions that can affect tube degradation. The various types of plants with Alloy 800 steam generat...

2012-06-26T23:59:59.000Z

127

Evaluation of Explosive Cleaning Damage in Ferritic Boiler Tubes  

Science Conference Proceedings (OSTI)

Utilities have reported boiler tube damage after explosive cleaning to control or remove slag deposits. The damage typically consists of tube crushing, denting, microcracking, and inner diameter (ID) initiated cracking. Because the latter two might not propagate through tube wall thickness initially, these types of cracking are not commonly detected during the cleaning process. However, tube failures after the boiler resumed service have been attributed to these ID-related cracking. Many utilities have r...

2010-10-29T23:59:59.000Z

128

Failure probabilities of steam generator tubes. Annual report  

SciTech Connect

BNL's efforts focused on the following specific items; the probabilities of failure for perfect steam generator tubes, the probabilities of failure for steam generator tubes containing long axisymmetrically thinned sections, and the probabilities of failure for steam generator tubes containing finite length (relatively short) axisymmetric wastages. (auth)

Reich, M.

1975-08-01T23:59:59.000Z

129

Multifunctional robot to maintain boiler water-cooling tubes  

Science Conference Proceedings (OSTI)

A robot has been developed to maintain boiler water-cooling tubes. This robot has a double tracked moving mechanism, an ash cleaning device, a slag purging device, a tubes' thickness measurement device, a marking device, and a control system. This robot ... Keywords: Boiler maintenance, Boiler water-cooling tube, Climbing robot, Mobile robot

Xueshan Gao; Dianguo Xu; Yan Wang; Huanhuan Pan; Weimin Shen

2009-10-01T23:59:59.000Z

130

Heat transfer of finned tube bundles in crossflow  

SciTech Connect

This volume correlates findings on heat transfer and hydraulic drag of bundles of finned tubes in crossflow at Reynolds numbers from 10/sup 4/ to 10/sup 6/. These studies illustrate fin, local, and mean heat transfer coefficients; effects of geometric parameters of the fins; effect of tube location within the bundle on heat transfer and hydraulic drag; and resistance of finned tube bundles.

Stasiulevicius, J.; Skrinska, A.; Zukauskas, A.

1988-01-01T23:59:59.000Z

131

Finned Tube With Vortex Generators For A Heat Exchanger.  

DOE Patents (OSTI)

A system for and method of manufacturing a finned tube for a heat exchanger is disclosed herein. A continuous fin strip is provided with at least one pair of vortex generators. A tube is rotated and linearly displaced while the continuous fin strip with vortex generators is spirally wrapped around the tube.

Sohal, Monohar S. (Idaho Falls, ID); O' Brien, James E. (Idaho Falls, ID)

2004-09-14T23:59:59.000Z

132

Finned Tube With Vortex Generators For A Heat Exchanger.  

DOE Patents (OSTI)

A system for and method of manufacturing a finned tube for a heat exchanger is disclosed herein. A continuous fin strip is provided with at one pair of vortex generators. A tube is rotated and linearly displaced while the continuous fin strip with vortex generators is spirally wrapped around the tube.

Sohal, Manohar S. (Idaho Falls, ID); O' Brien, James E. (Idaho Falls, ID)

2005-12-20T23:59:59.000Z

133

Steam Generator Management Program: Assessment of Steam Generator Tube Plugs  

Science Conference Proceedings (OSTI)

EPRI Steam Generator Management Program guidelines require that utilities perform integrity assessments of all steam generator (SG) components, including tube plugs. SG inspection outages should specifically include monitoring of degradation in tube hardware such as plugs. This report provides guidance for utility engineers to use in determining tube plug inspection requirements, including scope, technique, and periodicity.BackgroundGenerally, utilities perform ...

2013-08-28T23:59:59.000Z

134

Tube cutter tool and method of use for coupon removal  

DOE Patents (OSTI)

It is well known in the art that metal tubes used in heat transfer devices are susceptible to wear, erosion and other degradations which may create weaknesses or other potential failure points. One typical prior art method to determine the cause of damage to a tube involves making a circumferential cut on the tube wall and removing the entire section of the tube having a damaged portion thereon. This method is useful where a straight length portion of the tube has been affected. However, access to more constricted areas and removal of relatively large sections of tubing is limited where the cutting procedure is performed from the interior of the tube. A tube cutter tool is insertable into a tube for cutting a coupon from a damaged site on the exterior of the tube. Prior to using the tool, the damaged site is first located from the interior of the tube using a multi-coil pancake eddy current test probe. The damage site is then marked. A fiber optic probe is used to monitor the subsequent cutting procedure which is performed using a hole saw mounted on the tube cutter tool. Prior to completion of the cutting procedure, a drill in the center of the hole saw is drilled into the coupon to hold it in place.

Nachbar, H.D.; Etten, M.P. Jr.; Kurowski, P.A.

1995-12-31T23:59:59.000Z

135

Tube skin temperature prediction of catalytic reforming unit (CRU) heaters  

Science Conference Proceedings (OSTI)

The maximum duty of reformer heaters is governed by the occurance of maximum tube skin temperature of the heaters. The value of maximum tube skin temperatures of the heaters must not exceed theirs' maximum allowable design temperature. The paper highlights ... Keywords: coke formation, finite element, simulations, tube furnance

Suzana Yusup; Nguyen Duy Vinh; Nurhayati Mellon; Abdullah Hassan

2006-10-01T23:59:59.000Z

136

Investigation of Pressure-Tube and Calandria-Tube Deformation Following a Single Channel Blockage Event in ACR-700  

E-Print Network (OSTI)

The ACR-700 is an advanced pressure-tube (PT) reactor being developed by Atomic Energy of Canada Limited (AECL). As in conventional CANDU reactors, the PTs are horizontal. Each PT is surrounded by a calandria tube (CT), ...

Buongiorno, Jacopo

137

Investigation of pressure-tube and calandria-tube deformation following a single channel blockage event in ACR-700  

E-Print Network (OSTI)

The ACR-700 is an advanced pressure-tube (PT) reactor being developed by Atomic Energy of Canada Limited (AECL). As in conventional CANDU reactors, the PTs are horizontal. Each PT is surrounded by a calandria tube (CT), ...

Gerardi, Craig Douglas

2006-01-01T23:59:59.000Z

138

Source Terms for HFIR Beam Tube Shielding Analyses, and a Complete Shielding Analysis of the HB-3 Tube  

SciTech Connect

The High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory is in the midst of a massive upgrade program to enhance experimental facilities. The reactor presently has four horizontal experimental beam tubes, all of which will be replaced or redesigned. The HB-2 beam tube will be enlarged to support more guide tubes, while the HB-4 beam tube will soon include a cold neutron source.

Bucholz, J.A.

2000-07-01T23:59:59.000Z

139

Helium-filled aluminum flight tubes  

NLE Websites -- All DOE Office Websites (Extended Search)

Helium-filled aluminum flight tubes. Helium-filled aluminum flight tubes. Detector housing for the CCD camera lens, mirror, and scintillator. For more information, contact Instrument Scientist: Hassina Bilheux, bilheuxhn@ornl.gov, 865.384.9630 neutrons.ornl.gov/instruments/HFIR/factsheets/Instrument-cg1d.pdf The CG-1D beam is used for neutron imaging measurements using a white beam. Apertures (with different diameters D (pinhole geometry) are used at the entrance of the helium-filled flight path to allow L/D variation from 400 to 800. L is the distance between the aperture and the detector (where the image is produced). Samples sit on a translation/ rotation stage for alignment and tomography purposes. Detectors for CG-1D include

140

DEVELOPMENT OF ODS HEAT EXCHANGER TUBING  

SciTech Connect

Work continued on three major tasks of this project--increasing the circumferential strength of MA956 tubing, joining of the MA956 alloy, and determination of the high temperature corrosion limits of the MA956 alloy. With respect to increasing the circumferential strength of a MA956 tube, all of the cold working operations (0, 10, 20, 30, 40%) and annealing treatments (1000, 1150, 1300 C) have been completed. The sample microstructures produced by this processing continue to be analyzed with TEM results providing valuable information on the strengthening mechanism of this alloy. Creep testing to determine the ''stress threshold'' curves for this alloy continues. Regarding joining of the MA956 alloy, additional welds were produced with the friction welding and transient liquid phase bonding techniques. And finally, laboratory high temperature corrosion testing of the material continues in both fluid-side and fire-side simulated environments.

Mark A. Harper, Ph.D.

2002-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Coupled-cavity drift-tube linac  

DOE Patents (OSTI)

A coupled-cavity drift-tube linac (CCDTL) combines features of the Alvarez drift-tube linac (DTL) and the .pi.-mode coupled-cavity linac (CCL). In one embodiment, each accelerating cavity is a two-cell, 0-mode DTL. The center-to-center distance between accelerating gaps is .beta..lambda., where .lambda. is the free-space wavelength of the resonant mode. Adjacent accelerating cavities have oppositely directed electric fields, alternating in phase by 180 degrees. The chain of cavities operates in a .pi./2 structure mode so the coupling cavities are nominally unexcited. The CCDTL configuration provides an rf structure with high shunt impedance for intermediate velocity charged particles, i.e., particles with energies in the 20-200 MeV range.

Billen, James H. (Los Alamos, NM)

1996-01-01T23:59:59.000Z

142

Fission of a multiphase membrane tube  

E-Print Network (OSTI)

A common mechanism for intracellular transport is the use of controlled deformations of the membrane to create spherical or tubular buds. While the basic physical properties of homogeneous membranes are relatively well-known, the effects of inhomogeneities within membranes are very much an active field of study. Membrane domains enriched in certain lipids in particular are attracting much attention, and in this Letter we investigate the effect of such domains on the shape and fate of membrane tubes. Recent experiments have demonstrated that forced lipid phase separation can trigger tube fission, and we demonstrate how this can be understood purely from the difference in elastic constants between the domains. Moreover, the proposed model predicts timescales for fission that agree well with experimental findings.

Jean-Marc Allain; Cornelis Storm; Aurelien Roux; Martine Ben Amar; Jean-Francois Joanny

2004-04-19T23:59:59.000Z

143

Fermilab Science Videos on YouTube  

DOE Data Explorer (OSTI)

Fermilab joined YouTube in November of 2006. The videos are organized into four playlists, including videos about the search for the Higgs Boson and a playlist called "Neutrino Stories." These videos are freely available to the public for viewing and can be interactively shared or commented on. Users can subscribe and be notified when new videos are posted to their specific area of interest.

144

Benchmarking boiler tube failures - Part 2  

Science Conference Proceedings (OSTI)

Part 1 of this article characterised the EUCG (formerly the Electric Utility Cost Group) Fossil Productivity Committee's study of 14 utilities with 219 baseload coal-fired steam plants (about 20% of the total number of coal plants in the USA) and their experience fighting tube leaks. Part 2 characterizes the sample of plants studied and summarises the data at the fleet level. The next study is scheduled for summer 2006. 3 figs., 2 tabs.

James Patrick; Robert Oldani; Daryl Von Behren [Ameren (United States)

2005-12-01T23:59:59.000Z

145

DEVELOPMENT OF ODS HEAT EXCHANGER TUBING  

SciTech Connect

Due to extenuating circumstances Special Metals Corporation is terminating their role as prime contractor with this Vision 21 project. In response to this situation, a status report for the project as of this date, has been prepared and follows. Significant work has been accomplished on three major tasks of this project--increasing the circumferential strength of MA956 tubing, joining of the MA956 alloy, and determination of the high temperature corrosion limits of the MA956 alloy. With respect to increasing the circumferential strength of a MA956 tube, the first rod extrusion campaign has been completed with microstructure analysis providing valuable information on the strengthening mechanism of this alloy. Also, based on the results obtained thus far extrusions of tubes are in process and creep testing to determine the ''stress threshold'' curves for this alloy continues. Regarding joining of the MA956 alloy, welds have been produced using the friction, explosive, magnetic impulse, and diffusion bonding techniques. Complete elevated temperature mechanical testing has not been conducted on joints produced using these methods, however room temperature tensile and shear testing has shown promising results on friction and explosive welds. And finally, laboratory high temperature corrosion testing of the material continues in both fluid-side and fire-side simulated environments. Brief summary status statements from each of the subcontractors is appended to this report which additionally contains the expected funding needed to complete the project.

Mark A. Harper, Ph.D.

2003-04-01T23:59:59.000Z

146

Recirculating wedges for metal-vapor plasma tubes  

DOE Patents (OSTI)

A metal vapor laser is disclosed that recycles condensed metal located at the terminal ends of a plasma tube back toward the center of the tube. A pair of arcuate wedges are incorporated on the bottom of the plasma tube near the terminal ends. The wedges slope downward toward the center so that condensed metal may be transported under the force of gravity away from the terminal ends. The wedges are curved to fit the plasma tube to thereby avoid forming any gaps within the tube interior. 8 figures.

Hall, J.P.; Sawvel, R.M.; Draggoo, V.G.

1994-06-28T23:59:59.000Z

147

Recirculating wedges for metal-vapor plasma tubes  

DOE Patents (OSTI)

A metal vapor laser is disclosed that recycles condensed metal located at the terminal ends of a plasma tube back toward the center of the tube. A pair of arcuate wedges are incorporated on the bottom of the plasma tube near the terminal ends. The wedges slope downward toward the center so that condensed metal may be transported under the force of gravity away from the terminal ends. The wedges are curved to fit the plasma tube to thereby avoid forming any gaps within the tube interior.

Hall, Jerome P. (Livermore, CA); Sawvel, Robert M. (Modesto, CA); Draggoo, Vaughn G. (Livermore, CA)

1994-01-01T23:59:59.000Z

148

Analysis of Steam Generator Tubing from Crystal River, Unit 3  

Science Conference Proceedings (OSTI)

Four tubes were removed from Crystal River Unit 3 steam generator B during the 1994 refueling outage (RFO 9). The tubes were examined to characterize any tube degradation associated with eddy current (EC) indications occurring at the 7th and 9th tube support plate (TSP) intersections, which were identified during RFO 8. Mechanical wear observed at the 7th and 9th TSP lands had almost no effect on the tubing's burst strength. Small patches of intergranular attack (IGA) were observed in the first freespan ...

1997-10-08T23:59:59.000Z

149

Segmented lasing tube for high temperature laser assembly  

DOE Patents (OSTI)

A high temperature laser assembly capable of withstanding operating temperatures in excess of 1500.degree. C. is described comprising a segmented cylindrical ceramic lasing tube having a plurality of cylindrical ceramic lasing tube segments of the same inner and outer diameters non-rigidly joined together in axial alignment; insulation of uniform thickness surround the walls of the ceramic lasing tube; a ceramic casing, preferably of quartz, surrounding the insulation; and a fluid cooled metal jacket surrounds the ceramic casing. In a preferred embodiment, the inner surface of each of the ceramic lasing tube segments are provided with a pair of oppositely spaced grooves in the wall thereof parallel to the center axis of the segmented cylindrical ceramic lasing tube, and both of the grooves and the center axis of the segmented cylindrical ceramic lasing tube lie in a common plane, with the grooves in each ceramic lasing tube segment in circumferential alignment with the grooves in the adjoining ceramic lasing tube segments; and one or more ceramic plates, all lying in a common plane to one another and with the central axis of the segmented ceramic lasing tube, are received in the grooves to provide additional wall area in the segmented ceramic lasing tube for collision and return to ground state of metastable metal atoms within the segmented ceramic lasing tube.

Sawicki, Richard H. (Danville, CA); Alger, Terry W. (Tracy, CA); Finucane, Raymond G. (Pleasanton, CA); Hall, Jerome P. (Livermore, CA)

1996-01-01T23:59:59.000Z

150

Ultrasonic liquid-in-line detector for tubes  

DOE Patents (OSTI)

An apparatus and method for detecting the presence of liquid in pipes or tubes using ultrasonic techniques. A first piezoelectric crystal is coupled to the outside of the pipe or tube at the location where liquid in the tube is to be detected. A second piezoelectric crystal is coupled to the outside of the pipe or tube at the same location along the tube but circumferentially displaced from the first crystal be an angle around the pipe or tube of less than 180{degree}. Liquid in the pipe or tube is detected by measuring the attenuation of an ultrasonic signal sent by the first piezoelectric crystal and received by the second piezoelectric crystal. 2 figs.

Piper, T.C.

1989-03-06T23:59:59.000Z

151

Coiled tubing drilling requires economic and technical analyses  

Science Conference Proceedings (OSTI)

Field experience has proven that coiled tubing drilling is a technical and economic option on some wells; however, coiled tubing drilling is not the solution to every drilling prospect or production-enhancement job. To determine if coiled tubing drilling is viable, the geographic, technical, and economic aspects of each project must be considered in detail. Generally, with some limitations, coiled tubing drilling is feasible primarily when jointed pipe cannot be used effectively. Also, coiled tubing drilling may be more appropriate because of some special well site requirements, such as environmental regulations requiring less surface disturbance. The paper discusses technical considerations which need to be considered, economic feasibility, limitations of well types (new shallow wells, conventional reentry, through-tubing reentry, and underbalanced drilling), and outlook for further growth in the coiled tubing drilling industry.

Gary, S.C. (Schlumberger Dowell, Sugar Land, TX (United States))

1995-02-20T23:59:59.000Z

152

Study for Snake Robot Technology for Inspection of Headers and Tubes in Heat Recovery Steam Generators  

Science Conference Proceedings (OSTI)

Heat recovery steam generator (HRSG) tubing is especially difficult to inspect using conventional nondestructive evaluation (NDE) techniques because: The tubing is tightly bundled, with interior bundle tubing typically inaccessible by conventional equipment without cutting and later repairing the exterior tubes. The tubing is finned and, since ultrasonic techniques require solid contact with the tube, cannot be accessed unless the tubing is cut away. Access to the inside of the tubes is difficult, requi...

2009-11-10T23:59:59.000Z

153

CFD study of using a tube insert and an air blowing system to prevent tube failure in the Bisotoun power plant boiler  

Science Conference Proceedings (OSTI)

In this study attempts to find a theoretical solution to prevent tube explosion of the tubes placed in the superheater region of the Bisotoun Power Plant boiler, Iran. The boiler has three types of tube and the tube failure was occurred in the long length ... Keywords: CFD, air blowing, boiler, combustion, modeling, tube insert

Masoud Rahimi; Seyed Mehdi Shariati; Abbas Khoshhal

2005-08-01T23:59:59.000Z

154

Sound Coiled-Tubing Drilling Practices  

Science Conference Proceedings (OSTI)

This Coiled-Tubing Drilling (CTD) Sound Practices Manual provides tools needed by CTD engineers and supervisors to plan, design and perform safe, successful CTD operations. As emphasized throughout, both careful planning and attention to detail are mandatory for success. A bibliography of many useful CTD references is presented in Chapter 6. This manual is organized according to three processes: 1) Pre-Job Planning Process, 2) Operations Execution Process, and 3) Post-Job Review Process. Each is discussed in a logical and sequential format.

Williams, Thomas; Deskins, Greg (Maurer Technology Inc.); Ward, Stephen L. (Advantage Energy Services Ltd); Hightower, Mel

2001-09-30T23:59:59.000Z

155

Sodium Chloride Hideout In a Simulated Steam Generator Tube and Tube Support Place Crevice  

Science Conference Proceedings (OSTI)

Localized corrosion of steam generator (SG) tubing in PWRs has been a serious problem that limits the life of this component. Preliminary measurements of sodium chloride hideout in simulated PWR SG crevices have shown that hideout rate increases with heat flux and concentration of sodium chloride in the bulk water.

1998-06-30T23:59:59.000Z

156

MHK Technologies/Anaconda bulge tube drives turbine | Open Energy  

Open Energy Info (EERE)

Anaconda bulge tube drives turbine Anaconda bulge tube drives turbine < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Anaconda bulge tube drives turbine.jpg Technology Profile Primary Organization Checkmate SeaEnergy Technology Resource Click here Wave Technology Type Click here Oscillating Wave Surge Converter Technology Readiness Level Click here TRL 4 Proof of Concept Technology Description Anaconda uses a large water filled distensible rubber tube floating just beneath the ocean surface and oriented parallel to wave direction As a wave passes the bulge tube is lifted with the surrounding water and this causes a bulge wave to be excited which then passes down the tubes walls gathering energy from the ocean wave as it passes By matching the speed of the bulge wave to that of the sea wave resonance is achieved and high power capture becomes possible The bulge waves are then used to drive a turbine generator located at the stern of the device

157

The ATLAS Experiment on YouTube  

DOE Data Explorer (OSTI)

ATLAS is a particle physics experiment at the Large Hadron Collider at CERN. The ATLAS detector is searching for new discoveries in the head-on collisions of protons of extraordinarily high energy. ATLAS will learn about the basic forces that have shaped our Universe since the beginning of time and that will determine its fate. Among the possible unknowns are the origin of mass, extra dimensions of space, unification of fundamental forces, and evidence for dark matter candidates in the Universe [copied from http://atlas.ch/]. Approximately 700 physicists, engineers and graduate students from 44 U.S. institutions, including four DOE laboratories, participate in the ATLAS collaboration. In addition to the Collaboration's home page and numerous ATLAS-related pages at the various research organizations involved, there are two primary ATLAS websites that provide the full range of information about this experiment at the Large Hadron Collider in at CERN, Switzerland. The main ATLAS Experiment page hosted by CERN is found at http://atlas.ch/, while the home page specifically for the U.S. contribution to ATLAS is at http://www.uslhc.us/The_US_and_the_LHC/Experiments/ATLAS. Likewise, videos and multimedia from the inception and construction of ATLAS and continuing on through current operations and scientific discoveries are found everywhere from Brookhaven Lab to YouTube to an official collection at the ATLAS Experiment page at CERN. This DDE record guides you to the ATLAS Experiment Channel on YouTube.

158

Heat transfer in bundles of finned tubes in crossflow  

SciTech Connect

This book provides correlations of heat transfer and hydraulic data for bundles of finned tubes in crossflow at high Reynolds numbers. Results of studies of the effectiveness of the fin, local, and mean heat transfer coefficients are presented. The effect of geometric parameters of the fins and of the location of tubes in the bundle on heat transfer and hydraulic drag are described. The resistance of the finned tube bundles under study and other factors are examined.

Stasiulevicius, J.; Skrinska, A.; Zukauskas, A.; Hewitt, G.F.

1986-01-01T23:59:59.000Z

159

dc-plasma-sprayed electronic-tube device  

DOE Patents (OSTI)

An electronic tube and associated circuitry which is produced by dc plasma arc spraying techniques is described. The process is carried out in a single step automated process whereby both active and passive devices are produced at very low cost. The circuitry is extremely reliable and is capable of functioning in both high radiation and high temperature environments. The size of the electronic tubes produced are more than an order of magnitude smaller than conventional electronic tubes.

Meek, T.T.

1982-01-29T23:59:59.000Z

160

Growth Characteristics in Waterwall Tubes of Supercritical Units  

Science Conference Proceedings (OSTI)

Waterwall tubes in some of the existing fleet of U.S. supercritical steam boilers operating with oxygenated water treatment (OT) are experiencing the growth of duplex oxide scales of similar morphology to those found in the circuitry of steam-touched superheater and reheater tubing. A 2009 EPRI report, Oxide Scale Growth Characteristics in Waterwall Tubes of Supercritical Steam Boilers (1015656), examined the conditions at which these oxides are formed. This report provides information to allow the predi...

2010-03-31T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Fundamental Assessment of Steam Generator Line Contact Tube Support Fouling  

Science Conference Proceedings (OSTI)

This report describes the current progress of a project to predict the tendency for fouling and dryout at the line contact point between steam generator tubes and tube support plates. This first phase of the project is focused on evaluating the susceptibility of specific support designs (concave, flat, convex broached lands, and eggcrates) to fouling. This report describes the first modeling task aimed at development of a simple thermal hydraulic model that describes the local mass velocity in the tube s...

2004-05-18T23:59:59.000Z

162

Examination of Crystal River Unit 3 Steam Generator Tube Sections  

Science Conference Proceedings (OSTI)

An examination of seven tubes removed from the Crystal River unit 3 steam generator characterized tube degradation associated with low-voltage eddy-current indications in the free span region above the lower tubesheet. The defects responsible for the low-voltage eddy-current signals consisted of small, relatively shallow, isolated, pit-like spots of outside-diameter-initiated intergranular attack, which had almost no effect on the burst strength of the tubing.

1994-05-31T23:59:59.000Z

163

Tube-wave Seismic Imaging and Monitoring Method for Oil ...  

Valeri Korneev at Berkeley National Lab has developed a low cost method for real-time seismic monitoring of underground fluid reservoirs based on tube-wave analysis.

164

Tube-wave Seismic Imaging and Monitoring Method for Oil ...  

Tube-wave Seismic Imaging and Monitoring Method for Oil Reservoirs and Aquifers Lawrence Berkeley National Laboratory. Contact LBL About This Technology

165

Assembly and method for testing the integrity of stuffing tubes  

DOE Patents (OSTI)

A stuffing tube integrity checking assembly includes first and second annular seals, with each seal adapted to be positioned about a stuffing tube penetration component. An annular inflation bladder is provided, the bladder having a slot extending longitudinally there along and including a separator for sealing the slot. A first valve is in fluid communication with the bladder for introducing pressurized fluid to the space defined by the bladder when mounted about the tube. First and second releasible clamps are provided. Each clamp assembly is positioned about the bladder for securing the bladder to one of the seals for thereby establishing a fluid-tight chamber about the tube.

Morrison, E.F.

1996-12-31T23:59:59.000Z

166

Sandia National Laboratories X-ray Tube with Magnetic Electron ...  

... for the U.S. Department of Energys National ... high average power large area X-ray tube provides increased X-ray generation efficiency through ...

167

Bore tube assembly for steam cooling a turbine rotor  

SciTech Connect

An axial bore tube assembly for a turbine is provided to supply cooling steam to hot gas components of the turbine wheels and return the spent cooling steam. A pair of inner and outer tubes define a steam supply passage concentric about an inner return passage. The forward ends of the tubes communicate with an end cap assembly having sets of peripheral holes communicating with first and second sets of radial tubes whereby cooling steam from the concentric passage is supplied through the end cap holes to radial tubes for cooling the buckets and return steam from the buckets is provided through the second set of radial tubes through a second set of openings of the end cap into the coaxial return passage. A radial-to-axial flow transitioning device, including anti-swirling vanes is provided in the end cap. A strut ring adjacent the aft end of the bore tube assembly permits axial and radial thermal expansion of the inner tube relative to the outer tube.

DeStefano, Thomas Daniel (Ballston Lake, NY); Wilson, Ian David (Clifton Park, NY)

2002-01-01T23:59:59.000Z

168

Life Assessment Methods for Power Plant Piping and Tubing  

Science Conference Proceedings (OSTI)

...life prediction High-temperature crack growth methods ):36, Ref 35Similar to gas turbine blades, piping and tubing in steamlines, heaters,

169

Reactor Loose Part Damage Assessments on Steam Generator Tube Sheets.  

E-Print Network (OSTI)

??PROCTOR, WILLIAM CYRUS. Reactor Loose Part Damage Assessments on Steam Generator Tube Sheets. (Under the direction of Joseph Michael Doster). Damage from loose parts inside (more)

Proctor, William Cyrus

2010-01-01T23:59:59.000Z

170

AB Electronic Tubes and Quasi-Superconductivity at Room Temperature  

E-Print Network (OSTI)

Author offers and researches a new idea - filling tubes by electronic gases. He shows: If the insulating envelope (cover) of the tube is charged positively, the electrons within the tube are not attracted to covering. Tube (as a whole) remains a neutral (uncharged) body. The electron gas in the tube has very low density and very high conductivity, close to superconductivity. If we take the density (pressure) of electron gas as equal to atmospheric pressure, the thickness of insulator film may be very small and the resulting tube is very light. Author shows the offered tubes can be applied to many technical fields. For example: (1) Transfer of energy over very long distance with very small electric losses. (2) Design of cheap high altitude electric lines without masts. (3) Transfer of energy from one continent to another continent through the ionosphere. (4) Transfer of a plasma beam (which can convey thrust and energy) from Earth surface to a space ship. (5) Observation of the sky by telescope without atmospheric hindrances. (6) Dirigibles (air balloons) of the highest lift force. (7) Increasing of gun range severalfold. (8) Transfer of matter. And so on. Key words: AB tubes, electronic tubes, superconductivity, transmission energy.

Alexander Bolonkin

2008-05-02T23:59:59.000Z

171

Performance Analysis of Tube-Fin Heat Exchanger under Vibration.  

E-Print Network (OSTI)

??The effects of vibration on the airside heat transfer and pressure drop characteristics are experimented and analyzed. The experiment is conducted on a flat tube (more)

Kannan, Jayaprakash

2012-01-01T23:59:59.000Z

172

Practical tip: Precooling topical calcineurin inhibitors tube; reduces burning sensation  

E-Print Network (OSTI)

inhibitors tube; reduces burning sensation Sultan Al-salkhenaizan@hotmail.com Abstract Burning sensation at theuse, does reduce the burning sensation and enable most

Al-Khenaizan, Sultan

2010-01-01T23:59:59.000Z

173

Penetrameter positioner for bore-side radiography of tubes  

DOE Patents (OSTI)

A positioner is provided for placing plaque or wire penetrameters, as used in radiographic inspection, in close proximity with the inner wall of tubing at any desired location along the tubing. The positioner head carrying the penetrameter is inflatable whereby it is positioned in tte deflated condition, inflated to place the penetrameter against a weld to be inspected in the tubing wall, and then deflated during removal. If desired, the penetrameter holder may be used to center the radiographic source on the axis of the tube.

Davis, E.V.; Foster, B.E.

1980-02-05T23:59:59.000Z

174

X-ray Tube with Magnetic Electron Steering - Energy ...  

The high average power large area X-ray tube provides ... Solar Photovoltaic; Solar ... Description This invention consists of a cathode and anode ...

175

MEE 452: Example 3-2 ShellShell--andand--Tube Heat Exchanger Analysis:Tube Heat Exchanger Analysis  

E-Print Network (OSTI)

minmaxminmax min ,;; ,min)()( C C NTU C UA NTU TC q q q CCCcmCcmC UA CHCpCHpH #12;Tube arrangement in shell

Kostic, Milivoje M.

176

Heat transfer and hydrodynamics analysis of a novel dimpled tube  

SciTech Connect

In the present investigation, heat transfer and hydrodynamics analysis of a new enhanced heat transfer tube with ellipsoidal dimples was carried out. The dimples are disposed to form a certain specified angle between the major axis of the ellipsoid and flow direction, and the direction of the major axis of each adjacent ellipsoidal dimple in the same cross-section is alternated. Experimental tests were carried out with heating water on the shell side with a constant flow rate, and cold air in the tube side with flow rates range from 1 to 55 m{sup 3}/h. The temperatures and pressures for the inlet and outlet of both sides were measured. The heat transfer and pressure drop of the new dimpled tube were investigated and compared with the results of a dimpled tube with spherical dimples and a conventional smooth tube. The computed results indicated that the Nusselt number for ellipsoidal dimpled tube and spherical dimpled tube are 38.6-175.1% and 34.1-158% higher than that for the smooth tube respectively. The friction factors of dimpled tube increase by 26.9-75% and 32.9-92% for ellipsoidal and spherical dimples compared with the smooth tube respectively. It was perceived that ellipsoidal dimple roughness accelerates transition to critical Reynolds numbers down to less than 1000. By integrated performance evaluation of (Nu{sub a}/Nu{sub s})/(f{sub a}/f{sub s}), a maximum of about 87% heat transfer enhancement with the same friction penalty could be achieved by optimize the dimpled tube design. (author)

Wang, Yu.; He, Ya-Ling; Lei, Yong-Gang; Zhang, Jie [State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China)

2010-11-15T23:59:59.000Z

177

Bonneville Power Administration's YouTube Channel  

DOE Data Explorer (OSTI)

The Bonneville Power Administration is one of DOE's four power marketing administration organizations. BPA describes its mission as a public service organization as one designed create and deliver the best value for our customers and constituents as we act in concert with others to assure the Pacific Northwest: 1) An adequate, efficient, economical and reliable power supply; 2) A transmission system that is adequate to the task of integrating and transmitting power from federal and non-federal generating units, providing service to BPA's customers, providing interregional interconnections, and maintaining electrical reliability and stability; and 3) Mitigation of the Federal Columbia River Power System's impacts on fish and wildlife. The more than 100 videos on BPA's YouTube channel are organized into 12 playlists, including: Technology R&D, Renewable Energy, Hydropower, Energy Efficiency and Conservation, Transmission, Environment, Fish, and Wildlife, Vegetation Management and Public Safety, Value of the River Education Series, and Community and Education.

178

Hanford Site Videos on YouTube  

DOE Data Explorer (OSTI)

For more than forty years, reactors located at Hanford produced plutonium for America's defense program. The process of making plutonium is extremely inefficient in that a massive amount of liquid and solid waste is generated while only a small amount of plutonium is produced. Additionally, all of the facilities and structures that were associated with Hanford's defense mission must also be deactivated, decommissioned, decontaminated, and demolished. That environmental cleanup project is the work that approximately 11,000 Hanford employees are involved with today [copied from http://www.hanford.gov/page.cfm/HanfordsPresentMission]. Snapshots of the work, the issues, and the cleanup successes can be seen on the Hanford Site's YouTube channel. Short clips illustrate demolition projects, installtion of components such as a liner for the landfill, events such as the site fire in 2007 and Secretary of Energy Chu's visit in 2010. Recovery Act Work is highlighted as well.

179

Glass heat pipe evacuated tube solar collector  

DOE Patents (OSTI)

A glass heat pipe is adapted for use as a solar energy absorber in an evacuated tube solar collector and for transferring the absorbed solar energy to a working fluid medium or heat sink for storage or practical use. A capillary wick is formed of granular glass particles fused together by heat on the inside surface of the heat pipe with a water glass binder solution to enhance capillary drive distribution of the thermal transfer fluid in the heat pipe throughout the entire inside surface of the evaporator portion of the heat pipe. Selective coatings are used on the heat pipe surface to maximize solar absorption and minimize energy radiation, and the glass wick can alternatively be fabricated with granular particles of black glass or obsidian.

McConnell, Robert D. (Lakewood, CO); Vansant, James H. (Tracy, CA)

1984-01-01T23:59:59.000Z

180

Tenori-on stage: YouTube as performance space  

Science Conference Proceedings (OSTI)

This paper reports findings from four related studies of the "Tenori-on" as it appears on YouTube in order to consider Web 2.0 as a performance space. A quantitative analysis of returns for "Tenori-on" attempts to model how posts achieve and maintain ... Keywords: Tenori-on, YouTube, critical theory, interaction criticism, user experience

Mark Blythe; Paul Cairns

2010-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Equilibrium Conformations of Concentric-tube Continuum Robots  

Science Conference Proceedings (OSTI)

Robots consisting of several concentric, preshaped, elastic tubes can work dexterously in narrow, constrained, and/or winding spaces, as are commonly found in minimally invasive surgery. Previous models of these ??active cannulas? assume ... Keywords: active cannula, concentric tube robot, continuum robot, elastica, flexible arms, kinematics, mechanics, medical robots, snake-like robot, variational calculus

D. Caleb Rucker; Robert J. Webster, III; Gregory S. Chirikjian; Noah J. Cowan

2010-09-01T23:59:59.000Z

182

Analysis of tubes filled with charged electron gas  

E-Print Network (OSTI)

We show that tubes filled with electron gas, as presented by A.Bolonkin, are not possible with current materials. First, the pressure of the charges on the outer surface cancel almost all of the electrostatic pressure of the inner electrons. Second, due to the mutually repulsion most of the electrons are in the outmost shell of the tube and not individually free.

Stefan Karrmann

2011-02-24T23:59:59.000Z

183

Drift tube suspension for high intensity linear accelerators  

DOE Patents (OSTI)

The disclosure relates to a drift tube suspension for high intensity linear accelerators. The system comprises a series of box-sections girders independently adjustably mounted on a linear accelerator. A plurality of drift tube holding stems are individually adjustably mounted on each girder.

Liska, D.J.; Schamaun, R.G.; Clark, D.C.; Potter, R.C.; Frank, J.A.

1980-03-11T23:59:59.000Z

184

Children and YouTube: access to safe content  

Science Conference Proceedings (OSTI)

Watching cartoons is part of a child's daily routine. Today the Internet and social video repositories such as YouTube encourage exploration for new online videos, but pornography is dramatically pervasive on the Internet and children may accidently ... Keywords: YouTube, audio, children, pornography, user interface

Marina Buzzi

2011-09-01T23:59:59.000Z

185

Suppression of acoustic streaming in tapered pulse tubes  

Science Conference Proceedings (OSTI)

In a pulse tube cryocooler, the gas in the pulse tube can be thought of as an insulating piston, transmitting pressure and velocity from the cold heat exchanger to the hot end of the pulse tube. Unfortunately, convective heat transfer can carry heat from the hot end to the cold end and reduce the net cooling power. Here, the authors discuss one driver of such convection: steady acoustic streaming as generated by interactions between the boundary and the oscillating pressure, velocity, and temperature. Using a perturbation method, they have derived an analytical expression for the streaming in a tapered pulse tube with axially varying mean temperature in the acoustic boundary layer limit. The calculations showed that the streaming depends strongly on the taper angle, the ratio of velocity and pressure amplitudes, and the phase between the velocity and pressure, but it depends only weakly on the mean temperature profile and is independent of the overall oscillatory amplitude. With the appropriate tapering of the tube, streaming can be eliminated for a particular operating condition. Experimentally, the authors have demonstrated that an orifice pulse tube cryocooler with the calculated zero-streaming taper has more cooling power than one with either a cylindrical tube or a tapered pulse tube with twice the optimum taper angle.

Olson, J.R.; Swift, G.W.

1998-12-31T23:59:59.000Z

186

Heat exchanger with leak detecting double wall tubes  

DOE Patents (OSTI)

A straight shell and tube heat exchanger utilizing double wall tubes and three tubesheets to ensure separation of the primary and secondary fluid and reliable leak detection of a leak in either the primary or the secondary fluids to further ensure that there is no mixing of the two fluids.

Bieberbach, George (Tampa, FL); Bongaards, Donald J. (Seminole, FL); Lohmeier, Alfred (Tampa, FL); Duke, James M. (St. Petersburg, all of, FL)

1981-01-01T23:59:59.000Z

187

ORIGINAL ARTICLE Yield prediction for seamless tubing processes  

E-Print Network (OSTI)

and natural gas exploration and production, fluid transmission, and the construction indus- try. A market survey of the American steel industry indicated that the American oil rig count experienced a decline an increasing demand for seamless tubing for gas and oil production [1]. Steel tubes are made by several

Huang, Samuel H.

188

Examination of Trojan Steam Generator Tubes: Volumes 1-3  

Science Conference Proceedings (OSTI)

Examination of 10 tubes removed from Trojan steam generators characterized the depth and type of defects associated with eddy-current signals originating at the tube support plate (TSP) locations. The TSP indications were associated with 49-89% through-wall secondary-side intergranular degradation confined within the support. Burst pressures of these degraded TSP locations exceeded regulatory requirements.

1992-12-01T23:59:59.000Z

189

THE UV-TUBE AS AN APPROPRIATE WATER DISINFECTION TECHNOLOGY  

E-Print Network (OSTI)

-Tube, as the cost per liter of water produced decreases as water use increases. The water quality is regulatedi THE UV-TUBE AS AN APPROPRIATE WATER DISINFECTION TECHNOLOGY: An Assessment of Technical of contaminated drinking water ­ which causes so many deaths and so much illness ­ should have a simple technical

Kammen, Daniel M.

190

Variable-energy drift-tube linear accelerator  

SciTech Connect

A linear accelerator system includes a plurality of post-coupled drift-tubes wherein each post coupler is bistably positionable to either of two positions which result in different field distributions. With binary control over a plurality of post couplers, a significant accumlative effect in the resulting field distribution is achieved yielding a variable-energy drift-tube linear accelerator.

Swenson, Donald A. (Los Alamos, NM); Boyd, Jr., Thomas J. (Los Alamos, NM); Potter, James M. (Los Alamos, NM); Stovall, James E. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

191

Drift tube suspension for high intensity linear accelerators  

SciTech Connect

The disclosure relates to a drift tube suspension for high intensity linear accelerators. The system comprises a series of box-sections girders independently adjustably mounted on a linear accelerator. A plurality of drift tube holding stems are individually adjustably mounted on each girder.

Liska, Donald J. (Los Alamos, NM); Schamaun, Roger G. (Los Alamos, NM); Clark, Donald C. (Los Alamos, NM); Potter, R. Christopher (Los Alamos, NM); Frank, Joseph A. (Los Alamos, NM)

1982-01-01T23:59:59.000Z

192

Detailed Root Cause Analysis of SG Tube ODSCC Indications within ...  

Science Conference Proceedings (OSTI)

Crack Growth Rates of Irradiated Commercial Stainless Steels in BWR and PWR ... Detailed Root Cause Analysis of SG Tube ODSCC Indications within the Tube Sheets of NPP Biblis Unit A .... Radiation Damage in Fe-C-Met Model Alloys ... Stress Corrosion Cracking Behavior near the Fusion Boundary of Dissimilar Weld

193

Heavy wall production tubing design for special alloy steels  

SciTech Connect

Critical wells require a comprehensive design philosophy for downhole tubulars. This paper describes novel design techniques used on four key tasks in tubing design common to all severe service wells: Material Selection, Sizing the Tubing, Threaded Connector Qualification, Field Installation Planning. The in-depth engineering approach applies stringent material and threaded connector qualification with new tubing sizing methods and thorough installation planning. Standard tubing sizing methods are unacceptable due to conservatism with respect to erosional velocity and inaccuracy with respect to stress analysis. Proper stress analysis of alloys requires consideration of triaxial stress, anisotropy, and temperatureweakening. New design equations are given for tubing sizing applicable to critical, corrosive wells where special materials are selected for corrosion mitigation.

Payne, M.L.; Hurst, D.M.

1984-04-01T23:59:59.000Z

194

Guidelines for PWR Steam Generator Tubing Specifications and Repair: Volume 2, Revision 1: Guidelines for Procurement of Alloy 690 S team Generator Tubing  

Science Conference Proceedings (OSTI)

This revised document provides guidelines for procuring Alloy 690 steam generator tubing and sleeve material.

1999-04-14T23:59:59.000Z

195

Proceedings: International Conference on Boiler Tube Failures and Heat Recovery Steam Generator (HRSG) Tube Failures and Inspections  

SciTech Connect

Tube failures remain the leading cause of availability loss in conventional fossil plants and combined cycle/heat recovery steam generator (HRSG) plants. These conference proceedings address state-of-the-art practices and techniques worldwide for understanding and reducing tube failures.

None

2002-10-01T23:59:59.000Z

196

Microhole Coiled Tubing Bottom Hole Assemblies  

Science Conference Proceedings (OSTI)

The original objective of the project, to deliver an integrated 3 1/8-inch diameter Measurement While Drilling (MWD) and Logging While Drilling (LWD) system for drilling small boreholes using coiled tubing drilling, has been achieved. Two prototype systems have been assembled and tested in the lab. One of the systems has been successfully tested downhole in a conventional rotary drilling environment. Development of the 3 1/8-inch system has also lead to development and commercialization of a slightly larger 3.5-inch diameter system. We are presently filling customer orders for the 3.5-inch system while continuing with commercialization of the 3 1/8-inch system. The equipment developed by this project will be offered for sale to multiple service providers around the world, enabling the more rapid expansion of both coiled tubing drilling and conventional small diameter drilling. The project was based on the reuse of existing technology whenever possible in order to minimize development costs, time, and risks. The project was begun initially by Ultima Labs, at the time a small company ({approx}12 employees) which had successfully developed a number of products for larger oil well service companies. In September, 2006, approximately 20 months after inception of the project, Ultima Labs was acquired by Sondex plc, a worldwide manufacturer of downhole instrumentation for cased hole and drilling applications. The acquisition provided access to proven technology for mud pulse telemetry, downhole directional and natural gamma ray measurements, and surface data acquisition and processing, as well as a global sales and support network. The acquisition accelerated commercialization through existing Sondex customers. Customer demand resulted in changes to the product specification to support hotter (150 C) and deeper drilling (20,000 psi pressure) than originally proposed. The Sondex acquisition resulted in some project delays as the resistivity collar was interfaced to a different MWD system and also as the mechanical design was revised for the new pressure requirements. However, the Sondex acquisition has resulted in a more robust system, secure funding for completion of the project, and more rapid commercialization.

Don Macune

2008-06-30T23:59:59.000Z

197

Steam generator tube rupture effects on a LOCA  

SciTech Connect

A problem currently experienced in commercial operating pressurized water reactors (PWR) in the United States is the degradation of steam generator tubes. Safety questions have arisen concerning the effect of these degraded tubes rupturing during a postulated loss-of-coolant accident (LOCA). To determine the effect of a small number of tube ruptures on the behavior of a large PWR during a postulated LOCA, a series of computer simulations was performed. The primary concern of the study was to determine whether a small number (10 or less of steam generator tubes rupturing at the beginning surface temperatures. Additional reflood analyses were performed to determine the system behavior when from 10 to 60 tubes rupture at the beginning of core reflood. The FLOOD4 code was selected as being the most applicable code for use in this study after an extensive analysis of the capabilities of existing codes to perform simulations of a LOCA with concurrent steam generator tube ruptures. The results of the study indicate that the rupturing of 10 or less steam generator tubes in any of the steam generators during a 200% cold leg break will not result in a significant increase in the peak cladding temperature. However, because of the vaporization of the steam generator secondary water in the primary side of the steam generator, a significant increase in the core pressure occurs which retards the reflooding process.

LaChance, J.L.

1979-01-01T23:59:59.000Z

198

Fluidized bed heat exchanger utilizing angularly extending heat exchange tubes  

DOE Patents (OSTI)

A fluidized bed heat exchanger in which air is passed through a bed of particulate material containing fuel disposed in a housing. A steam/water natural circulation system is provided and includes a steam drum disposed adjacent the fluidized bed and a series of tubes connected at one end to the steam drum. A portion of the tubes are connected to a water drum and in the path of the air and the gaseous products of combustion exiting from the bed. Another portion of the tubes pass through the bed and extend at an angle to the upper surface of the bed.

Talmud, Fred M. (Berkeley Heights, NJ); Garcia-Mallol, Juan-Antonio (Morristown, NJ)

1980-01-01T23:59:59.000Z

199

FABRICATION OF TUBE TYPE FUEL ELEMENT FOR NUCLEAR REACTORS  

DOE Patents (OSTI)

A method of fabricating a nuclear reactor fuel element is given. It consists essentially of fixing two tubes in concentric relationship with respect to one another to provide an annulus therebetween, filling the annulus with a fissionablematerial-containing powder, compacting the powder material within the annulus and closing the ends thereof. The powder material is further compacted by swaging the inner surface of the inner tube to increase its diameter while maintaining the original size of the outer tube. This process results in reduced fabrication costs of powdered fissionable material type fuel elements and a substantial reduction in the peak core temperatures while materially enhancing the heat removal characteristics.

Loeb, E.; Nicklas, J.H.

1959-02-01T23:59:59.000Z

200

Coiled Tubing: State of the Industry and Future Role for NETL  

NLE Websites -- All DOE Office Websites (Extended Search)

Tubing - Well Intervention Coiled Tubing - Drilling SlimholeMicrohole Technology Shallow Production Exploration Logging Lateral Extension Reservoir Monitoring CO 2 IOR and...

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

In-bed tube bank for a fluidized-bed combustor  

DOE Patents (OSTI)

An in-bed tube bank (10) for a fluidized bed combustor. The tube bank (10) of the present invention comprises one or more fluid communicating boiler tubes (30) which define a plurality of selectively spaced boiler tube sections (32). The tube sections (32) are substantially parallel to one another and aligned in a common plane. The tube bank (10) further comprises support members (34) for joining adjacent tube sections (32), the support members (34) engaging and extending along a selected length of the tube sections (32) and spanning the preselected space therebetween.

Hemenway, Jr., Lloyd F. (Morgantown, WV)

1990-01-01T23:59:59.000Z

202

Coiled tubing drilling with supercritical carbon dioxide  

DOE Patents (OSTI)

A method for increasing the efficiency of drilling operations by using a drilling fluid material that exists as supercritical fluid or a dense gas at temperature and pressure conditions existing at a drill site. The material can be used to reduce mechanical drilling forces, to remove cuttings, or to jet erode a substrate. In one embodiment, carbon dioxide (CO.sub.2) is used as the material for drilling within wells in the earth, where the normal temperature and pressure conditions cause CO.sub.2 to exist as a supercritical fluid. Supercritical carbon dioxide (SC--CO.sub.2) is preferably used with coiled tube (CT) drilling equipment. The very low viscosity SC--CO.sub.2 provides efficient cooling of the drill head, and efficient cuttings removal. Further, the diffusivity of SC--CO.sub.2 within the pores of petroleum formations is significantly higher than that of water, making jet erosion using SC--CO.sub.2 much more effective than water jet erosion. SC--CO.sub.2 jets can be used to assist mechanical drilling, for erosion drilling, or for scale removal. A choke manifold at the well head or mud cap drilling equipment can be used to control the pressure within the borehole, to ensure that the temperature and pressure conditions necessary for CO.sub.2 to exist as either a supercritical fluid or a dense gas occur at the drill site. Spent CO.sub.2 can be vented to the atmosphere, collected for reuse, or directed into the formation to aid in the recovery of petroleum.

Kolle , Jack J. (Seattle, WA)

2002-01-01T23:59:59.000Z

203

Steam Generator Tube Integrity Program [Corrosion and Mechanics of  

NLE Websites -- All DOE Office Websites (Extended Search)

Steam Generator Tube Steam Generator Tube Integrity Program Capabilities Materials Testing Environmentally Assisted Cracking (EAC) of Reactor Materials Corrosion Performance/Metal Dusting Overview Light Water Reactors Fatigue Testing of Carbon Steels and Low-Alloy Steels Environmentally Assisted Cracking of Ni-Base Alloys Irradiation-Induced Stress Corrosion Cracking of Austenitic Stainless Steels Steam Generator Tube Integrity Program Air Oxidation Kinetics for Zr-based Alloys Fossil Energy Fusion Energy Metal Dusting Publications List Irradiated Materials Steam Generator Tube Integrity Other Facilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr Corrosion and Mechanics of Materials Light Water Reactors Bookmark and Share

204

Refrigerant forced-convection condensation inside horizontal tubes  

E-Print Network (OSTI)

High vapor velocity condensation inside a tube was studied theoretically. The heat transfer coefficients were calculated by the momentum and heat transfer analogy. The Von Karman universal velocity distribution was applied ...

Bae, Soonhoon

1969-01-01T23:59:59.000Z

205

Biology Department - Brookhaven National Laboratory YouTube  

NLE Websites -- All DOE Office Websites (Extended Search)

on the BNL YouTube Channel John Shanklin Engineered Plants Make Potential Precursor to Raw Material for Plastics. In a first step toward achieving industrial-scale green...

206

Continuous Flow Coupling and Decarboxylation Reactions Promoted by Copper Tubing  

E-Print Network (OSTI)

A convenient and efficient flow method for Ullmann condensations, Sonogashira couplings, and decarboxylation reactions using a commercially available copper tube flow reactor (CTFR) is described. The heated CTFR effects ...

Zhang, Yun

207

Structural evaluation of electrosleeved tubes under severe accident transients.  

Science Conference Proceedings (OSTI)

A flow stress model was developed for predicting failure of Electrosleeved PWR steam generator tubing under severe accident transients. The Electrosleeve, which is nanocrystalline pure nickel, loses its strength at temperatures greater than 400 C during severe accidents because of grain growth. A grain growth model and the Hall-Petch relationship were used to calculate the loss of flow stress as a function of time and temperature during the accident. Available tensile test data as well as high temperature failure tests on notched Electrosleeved tube specimens were used to derive the basic parameters of the failure model. The model was used to predict the failure temperatures of Electrosleeved tubes with axial cracks in the parent tube during postulated severe accident transients.

Majumdar, S.

1999-11-12T23:59:59.000Z

208

Eddy sensors for small diameter stainless steel tubes.  

SciTech Connect

The goal of this project was to develop non-destructive, minimally disruptive eddy sensors to inspect small diameter stainless steel metal tubes. Modifications to Sandia's Emphasis/EIGER code allowed for the modeling of eddy current bobbin sensors near or around 1/8-inch outer diameter stainless steel tubing. Modeling results indicated that an eddy sensor based on a single axial coil could effectively detect changes in the inner diameter of a stainless steel tubing. Based on the modeling results, sensor coils capable of detecting small changes in the inner diameter of a stainless steel tube were designed, built and tested. The observed sensor response agreed with the results of the modeling and with eddy sensor theory. A separate limited distribution SAND report is being issued demonstrating the application of this sensor.

Skinner, Jack L.; Morales, Alfredo Martin; Grant, J. Brian; Korellis, Henry James; LaFord, Marianne Elizabeth; Van Blarigan, Benjamin; Andersen, Lisa E.

2011-08-01T23:59:59.000Z

209

Failure Analysis of the Heat Exchanger Tubes Exposed to High ...  

Science Conference Proceedings (OSTI)

The bundle of the heat exchanger was removed from service after 8 years for metallurgical investigation. The tube side contains boiler feed water at 622oF and ...

210

Refrigerant forced-convection condensation inside horizontal tubes  

E-Print Network (OSTI)

High vapor velocity condensation inside a tube was studied theoretically. The heat transfer coefficients were calculated by the momentum and heat transfer analogy. The Von Karman universal velocity distribution was applied ...

Bae, Soonhoon

1970-01-01T23:59:59.000Z

211

CONCENTRIC TUBE FUEL ELEMENT SPRING ALIGNMENT SPACER DEVICE  

DOE Patents (OSTI)

A rib construction for a nuclear-fuel element is described, in which one of three peripherally spaced ribs adjacent to each end of the fuel element is mounted on a radially yielding spring that embraces the fuel element. This spring enables the fuel element to have a good fit with a coolant tube and yet to be easily inserted in and withdrawn from the tube. (AEC)

Weems, S.J.

1963-09-24T23:59:59.000Z

212

Steam generator tube integrity program: Phase II, Final report  

SciTech Connect

The Steam Generator Tube Integrity Program (SGTIP) was a three phase program conducted for the US Nuclear Regulatory Commission (NRC) by Pacific Northwest Laboratory (PNL). The first phase involved burst and collapse testing of typical steam generator tubing with machined defects. The second phase of the SGTIP continued the integrity testing work of Phase I, but tube specimens were degraded by chemical means rather than machining methods. The third phase of the program used a removed-from-service steam generator as a test bed for investigating the reliability and effectiveness of in-service nondestructive eddy-current inspection methods and as a source of service degraded tubes for validating the Phase I and Phase II data on tube integrity. This report describes the results of Phase II of the SGTIP. The object of this effort included burst and collapse testing of chemically defected pressurized water reactor (PWR) steam generator tubing to validate empirical equations of remaining tube integrity developed during Phase I. Three types of defect geometries were investigated: stress corrosion cracking (SCC), uniform thinning and elliptical wastage. In addition, a review of the publicly available leak rate data for steam generator tubes with axial and circumferential SCC and a comparison with an analytical leak rate model is presented. Lastly, nondestructive eddy-current (EC) measurements to determine accuracy of defect depth sizing using conventional and alternate standards is described. To supplement the laboratory EC data and obtain an estimate of EC capability to detect and size SCC, a mini-round robin test utilizing several firms that routinely perform in-service inspections was conducted.

Kurtz, R.J.; Bickford, R.L.; Clark, R.A.; Morris, C.J.; Simonen, F.A.; Wheeler, K.R.

1988-08-01T23:59:59.000Z

213

Weld Overlay of Waterwall Tubing, Repair Procedures and Contract Specifications  

Science Conference Proceedings (OSTI)

Waterwall tubing in electric utility boilers is experiencing wastage. This is compounded by the installation of low nitrogen oxides (low-NOx) burners for pollution control. These burners develop stage combustion that results in a reducing atmosphere. To combat these high wastage rates, waterwall tubing has been protected with corrosion resistant weld overlays. Overlays of waterwall surfaces were first used for corrosion protection in the mid-1980s, but with ever more stringent EPA emission standards, mor...

2002-02-28T23:59:59.000Z

214

Field Guide: Heat Recovery Steam Generator Tube Failure  

Science Conference Proceedings (OSTI)

In conventional and combined-cycle plants, boiler and heat recovery steam generator (HRSG) tube failures have been the main availability problem for as long as reliable statistics have been kept for each generating source. The three volumes of the Electric Power Research Institute (EPRI) report Boiler and Heat Recovery Steam Generator Tube Failures: Theory and Practice (1012757) present an in-depth description of the various HRSG and degradation mechanisms, providing plant owners and operators with the t...

2010-12-15T23:59:59.000Z

215

Enhanced heat transfer with metal wool filled tubes  

SciTech Connect

The Advanced Photon Source (APS) to be constructed at Argonne National Laboratory (ANL) utilizes magnetic devices which generate x-ray beams with very intense heat flux levels. The flux levels encountered can be one or two orders of magnitude higher than those commonly found in nuclear reactors or fusion devices. The beam line elements and optics on such beams pose significant challenge to the researchers and designers to keep them cooled at acceptable levels of surface temperature and/or temperature gradients. Therefore, methods and techniques achieving heat removal enhancement are constantly sought. One such technique suggested and considered is the use of conductive metal wool filled tubes where the filter is brazed to the tube walls. A comparative investigation of the conventionally achievable heat transfer coefficient h'' with water and the wall conductance of a heavy wall copper tube reveals that major resistance is on the coolant side. Therefore, there exists a significant opportunity to improve heat transfer in the tubes by enhancement of the coolant side. To this end a variety of copper wool filled tubes as well as a commercially available enhanced copper tube were subjected to laboratory tests with water and conventional heating to assess the resulting heat transfer improvement. Design improvements using enhanced cooling are discussed in terms of structural weight, controls, grazing angles, the operational reliability. 9 refs., 11 figs., 5 tabs.

Kuzay, T.M.; Collins, J.T.; Khounsary, A.M. (Argonne National Lab., IL (USA)); Morales, G. (Argonne National Lab., IL (USA) Texas Univ., El Paso, TX (USA))

1990-08-01T23:59:59.000Z

216

Apparatus and method for controlling heat transfer between a fluidized bed and tubes immersed therein  

DOE Patents (OSTI)

In a fluidized bed of solid particles having one or more heat exchange tubes immersed therein, the rate of heat transfer between the fluidized particles and a fluid flowing through the immersed heat exchange tubes is controlled by rotating an arcuate shield apparatus about each tube to selectively expose various portions of the tube to the fluidized particles.

Hodges, James L. (3 Hilltop Ave., Vernon, CT 06066); Cerkanowicz, Anthony E. (8 Fieldstone Dr., Livingston, NJ 07039)

1983-01-01T23:59:59.000Z

217

Apparatus and method for controlling heat transfer between a fluidized bed and tubes immersed therein  

DOE Patents (OSTI)

In a fluidized bed of solid particles having one or more heat exchange tubes immersed therein, the rate of heat transfer between the fluidized particles and a fluid flowing through the immersed heat exchange tubes is controlled by rotating an arcuate shield apparatus about each tube to selectively expose various portions of the tube to the fluidized particles.

Hodges, James L. (3 Hilltop Ave., Vernon, CT 06066); Cerkanowicz, Anthony E. (8 Fieldstone Dr., Livingston, NJ 07039)

1982-01-01T23:59:59.000Z

218

Axial thermal medium delivery tubes and retention plates for a gas turbine rotor  

SciTech Connect

In a multi-stage turbine rotor, tubes are disposed in openings adjacent the rotor rim for flowing a thermal medium to rotor buckets and returning spent thermal medium. The tubes have axially spaced lands of predetermined wall thickness with thin-walled tube sections between the lands and of increasing thickness from the forward to the aft ends of the tubes. A pair of retention plates are carried on the aft end face of the aft wheel and straddle the tube and engage against a shoulder on the tube to preclude displacement of the tube in an aft direction.

Mashey, Thomas Charles (Coxsackie, NY)

2002-01-01T23:59:59.000Z

219

Los Alamos National Laboratory W76 Pit Tube Lifetime Study  

SciTech Connect

A metallurgical study was requested as part of the Los Alamos National Laboratory (LANL) W76-1 life-extension program (LEP) involving a lifetime analysis of type 304 stainless steel pit tubes subject to repeat bending loads during assembly and disassembly operations at BWXT/Pantex. This initial test phase was completed during the calendar years of 2004-2006 and the report not issued until additional recommended tests could be performed. These tests have not been funded to this date and therefore this report is considered final. Tubes were reportedly fabricated according to Rocky Flats specification P14548 - Seamless Type 304 VIM/VAR Stainless Steel Tubing. Tube diameter was specified as 0.125 inches and wall thickness as 0.028 inches. A heat treat condition is not specified and the hardness range specification can be characteristic of both 1/8 and 1/4 hard conditions. Properties of all tubes tested were within specification. Metallographic analysis could not conclusively determine a specified limit to number of bends allowable. A statistical analysis suggests a range of 5-7 bends with a 99.95% confidence limit. See the 'Statistical Analysis' section of this report. The initial phase of this study involved two separate sets of test specimens. The first group was part of an investigation originating in the ESA-GTS [now Gas Transfer Systems (W-7) Group]. After the bend cycle test parameters were chosen (all three required bends subjected to the same amount of bend cycles) and the tubes bent, the investigation was transferred to Terri Abeln (Metallurgical Science and Engineering) for analysis. Subsequently, another limited quantity of tubes became available for testing and were cycled with the same bending fixture, but with different test parameters determined by T. Abeln.

Abeln, Terri G. [Los Alamos National Laboratory

2012-04-25T23:59:59.000Z

220

Crimp sealing of tubes flush with or below a fixed surface  

DOE Patents (OSTI)

An apparatus for crimp sealing and severing tubes flush or below a fixed surface. Tube crimping below a fixed surface requires an asymmetric die and anvil configuration. The anvil must be flat so that, after crimping, it may be removed without deforming the crimped tubes. This asymmetric die and anvil is used when a ductile metal tube and valve assembly are attached to a pressure vessel which has a fixed surface around the base of the tube at the pressure vessel. A flat anvil is placed against the tube. Die guides are placed against the tube on a side opposite the anvil. A pinch-off die is inserted into the die guides against the tube. Adequate clearance for inserting the die and anvil around the tube is needed below the fixed surface. The anvil must be flat so that, after crimping, it may be removed without deforming the crimped tubes.

Fischer, J.E.; Walmsley, D.; Wapman, P.D.

1994-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Crimp sealing of tubes flush with or below a fixed surface  

DOE Patents (OSTI)

An apparatus for crimp sealing and severing tubes flush or below a fixed surface. Tube crimping below a fixed surface requires an asymmetric die and anvil configuration. The anvil must be flat so that, after crimping, it may be removed without deforming the crimped tubes. This asymmetric die and anvil is used when a ductile metal tube and valve assembly are attached to a pressure vessel which has a fixed surface around the base of the tube at the pressure vessel. A flat anvil is placed against the tube. Die guides are placed against the tube on a side opposite the anvil. A pinch-off die is inserted into the die guides against the tube. Adequate clearance for inserting the die and anvil around the tube is needed below the fixed surface. The anvil must be flat so that, after crimping, it may be removed without deforming the crimped tubes. 8 figs.

Fischer, J.E.; Walmsley, D.; Wapman, P.D.

1996-08-20T23:59:59.000Z

222

Three Mile Island Plugged Tube Severance: A Study of Damage Mechanisms  

Science Conference Proceedings (OSTI)

During Fall 2001 outages, eddy-current inspections at Three Mile Island Unit 1 and Oconee Nuclear Station Unit 1 revealed wear scars on tubes surrounding previously plugged tubes. In both cases, investigations determined that the plugged tubes had severed and impacted neighboring tubes. As a result, the Nuclear Regulatory Commission (NRC) issued Information Notice 2002-02, which did not require a response but did suggest the industry investigate the generic problem of plugged tubes damaging neighboring t...

2003-05-19T23:59:59.000Z

223

Steam Generator Management Program: Experimental Studies of Flow Around Foreign Objects in a Tube Array  

Science Conference Proceedings (OSTI)

Tube wear caused by foreign objects (FOs) in steam generators can lead to unplanned and costly forced outages. The complex flow field within the tube bundle, coupled with the wide range of FO sizes and possible configurations relative to the tubes, poses a challenge to the understanding of the fundamental mechanisms of FO-tube interaction and prediction of the resulting tube wear.The goals of the project were (1) to develop an experimental apparatus and measurement system capable of ...

2013-12-18T23:59:59.000Z

224

Simple frictional analysis of helical buckling of tubing  

SciTech Connect

Previous analyses of helical buckling of tubing have not considered frictional forces. In this paper, differential equations are derived and solved for two simplified cases of interest: downward motion of the tubing-e.g., when buckling occurs during the landing of the tubing-and upward motion of the tubing-e.g., when buckling occurs as a result of thermal and differential pressure loading subsequent to landing. While somewhat more complicated than the conventional frictionless buckling equations, these solutions are still suitable for hand calculations. These solutions, however, do not represent general solutions to buckling with friction. Load reversals and lateral frictional forces add complications that would require computer analysis. Several examples are examined to evaluate the relative importance of friction, which has a significant impact on tubing length change for loaded cases. For instance, the choice of a conservative value for the friction coefficient may allow the solution of a difficult seal-design problem by reducing a large predicted length change. Friction also has an important effect on set-down loads. Frictionless buckling calculations do not give conservative results for this problem.

Mitchell, R.F.

1986-12-01T23:59:59.000Z

225

DIFFERING PROFESSIONAL OPINION ON STEAM GENERATOR TUBE ISSUES  

E-Print Network (OSTI)

whether immediate actions are needed, other than those already taken by the staff, to deal with steam generator tube issues. In February 2001, we submitted to the Executive Director for Operations (EDO) NUREG-1740 on a differing professional opinion (DPO) concerning alternative repair criteria for steam generator tubes. In that report, we concluded that alternative repair criteria were needed. The alternative repair criteria and the condition monitoring program for steam generator tubes that the staff has endorsed can provide adequate protection of the public health and safety. We did make recommendations to the EDO directed particularly at improving the technical bases of the alternative repair criteria and the reliability of the condition monitoring program. The more important of these recommendations are: # Evaluate the potential for progression of damage to steam generator tubes during rapid depressurization caused by a main steamline rupture. # Monitor performance to search for systematic deviations from the linear bound on the nonlinear processes of crack initiation and growth through steam generator tube walls.

unknown authors

2001-01-01T23:59:59.000Z

226

Reducing the risk, complexity and cost of coiled tubing drilling  

Science Conference Proceedings (OSTI)

Drilling vertical well extensions with coiled tubing, particularly in the underbalanced state, exploits the inherent strengths of coiled tubing including: The ability to enter slim holes against a live well head; The use of small equipment that is fast to rig up and down; and The ability to trip quickly and maintain a steady pressure downhole with continuous circulation. Coiled tubing has successfully been used to deepen hundreds of wells, yet this application has only received sporadic attention. There are some very important technical considerations when drilling non-directionally with coiled tubing that must be addressed to ensure a commercially successful job. A recent vertical drilling job carried out in Western Australia illustrates the critical engineering aspects of an underbalanced, non-directional, coiled tubing drilling job. This job was completed for Arc Energy in April 1999 and produced a well that stabilized at 1.1 MMcfd, where three other wells drilled conventionally into these zones had shown only trace amounts of hydrocarbon.

Portman, L. [BJ Services, Houston, TX (United States)

1999-07-01T23:59:59.000Z

227

DOE - Office of Legacy Management -- Summerville Tube Co - PA 24  

NLE Websites -- All DOE Office Websites (Extended Search)

Summerville Tube Co - PA 24 Summerville Tube Co - PA 24 FUSRAP Considered Sites Site: SUMMERVILLE TUBE CO. (PA.24) Eliminated from further consideration under FUSRAP Designated Name: Not Designated Alternate Name: None Location: Bridgeport , Pennsylvania PA.24-1 Evaluation Year: 1987 PA.24-1 Site Operations: Metal fabrication research and development on uranium metal in the early 1940s - Cold drawing of tuballoy aluminum sheathing. PA.24-1 Site Disposition: Eliminated - Potential for residual radioactive contamination considered remote due to limited scope of operations and quantity of radioactive material handled PA.24-1 Radioactive Materials Handled: Yes Primary Radioactive Materials Handled: Uranium PA.24-1 Radiological Survey(s): None Indicated Site Status: Eliminated from further consideration under FUSRAP

228

Friction Factor Measurements in an Equally Spaced Triangular Tube Array  

SciTech Connect

Friction factor data for adiabatic cross-flow of water in a staggered tube array was obtained over a Reynolds number range (based on hydraulic diameter and gap velocity) of about 10,000 to 250,000. The tubes were 12.7mm (0.5 inch) outer diameter, in a uniformly spaced triangular arrangement with a pitch-to-diameter ratio of 1.5. The friction factor was compared to several literature correlations, and was found to be best matched by the Idelchik correlation. Other correlations were found to vary significantly from the test data. Based on the test data, a new correlation is proposed for this tube bundle geometry which covers the entire Reynolds number range tested.

Vassallo P, Symolon P

2007-03-19T23:59:59.000Z

229

Immersing carbon nano-tubes in cold atomic gases  

E-Print Network (OSTI)

We investigate the sympathetic relaxation of a free-standing, vibrating carbon nano-tube that is mounted on an atom chip and is immersed in a cloud of ultra-cold atoms. Gas atoms colliding with the nano-tube excite phonons via a Casimir-Polder potential. We use Fermi's Golden Rule to estimate the relaxation rates for relevant experimental parameters and develop a fully dynamic theory of relaxation for the multi-mode phononic field embedded in a thermal atomic reservoir. Based on currently available experimental data, we identify the relaxation rates as a function of atom density and temperature that are required for sympathetic ground state cooling of carbon nano-tubes.

C. T. Wei; P. V. Mironova; J. Fortgh; W. P. Schleich; R. Walser

2013-07-08T23:59:59.000Z

230

Thermal Behavior of Floor Tubes in a Kraft Recovery Boiler  

DOE Green Energy (OSTI)

The temperatures of floor tubes in a slope-floored black liquor recovery boiler were measured using an array of thermocouples located on the tube crowns. It was found that sudden, short duration temperature increases occurred with a frequency that increased with distance from the spout wall. To determine if the temperature pulses were associated with material falling from the convective section of the boiler, the pattern of sootblower operation was recorded and compared with the pattern of temperature pulses. During the period from September, 1998, through February, 1999, it was found that more than 2/3 of the temperature pulses occurred during the time when one of the fast eight sootblowers, which are directed at the back of the screen tubes and the leading edge of the first superheater bank, was operating.

Barker, R.E.; Choudhury, K.A.; Gorog, J.P.; Hall, L.M.; Keiser, J.R.; Sarma, G.B.

1999-09-12T23:59:59.000Z

231

Unified pictures of Q-balls and Q-tubes  

E-Print Network (OSTI)

While Q-balls have been investigated intensively for many years, another type of nontopological solutions, Q-tubes, have not been understood very well. In this paper we make a comparative study of Q-balls and Q-tubes. First, we investigate their equilibrium solutions for four types of potentials. We find, for example, that in some models the charge-energy relation is similar between Q-balls and Q-tubes while in other models the relation is quite different between them. To understand what determines the charge-energy relation, which is a key of stability of the equilibrium solutions, we establish an analytical method to obtain the two limit values of the energy and the charge. Our prescription indicates how the existent domain of solutions and their stability depends on their shape as well as potentials, which would also be useful for a future study of Q-objects in higher-dimensional spacetime.

Takashi Tamaki; Nobuyuki Sakai

2012-08-22T23:59:59.000Z

232

Performance test plan for a space station toluene heater tube  

DOE Green Energy (OSTI)

Sundstrand Energy Systems was awarded a contract to investigate the performance capabilities of a toluene heater tube integral to a heat pipe as applied to the Organic Rankine Cycle (ORC) solar dynamic power system for the Space Station. This heat pipe is a subassembly of the heat receiver. The heat receiver, the heat absorption component of the ORC solar dynamic power system, consists of forty liquid metal heat pipes located circumferentially around the heat receiver`s outside diameter. Each heat pipe contains a toluene heater, two thermal energy storage (TES) canisters and potassium. The function of the heater tube is to heat the supercritical toluene to the required turbine inlet temperature. During the orbit of the space station, the heat receiver and thereby the heat pipe and heater tube will be subjected to variable heat input. The design of the heater must be such that it can accommodate the thermal and hydraulic variations that will be imposed upon it.

Parekh, M.B. [Sundstrand Energy Systems, Rockford, IL (United States)

1987-10-01T23:59:59.000Z

233

The Color Flux Tube as an Effective String  

Science Conference Proceedings (OSTI)

We investigate the low-energy regime of the confining string connecting color sources in Yang-Mills theory. First, we present results of the Monte Carlo measurement of the width of the flux tube between two static quarks in the fundamental representation both at zero and at finite temperature. Then we consider the confining flux tube connecting color sources in larger representations of the gauge group. For stable string - the k-strings - we study the Luscher term; for unstable strings we investigate their decay as the distance between the static sources is increased.

Pepe, Michele [INFN, Sezione di Milano-Bicocca, Edificio U2, Piazza della Scienza 3, 20126 Milano (Italy)

2011-05-24T23:59:59.000Z

234

Justification for Shielded Receiver Tube Additional Lead Shielding  

Science Conference Proceedings (OSTI)

In order to reduce high radiation dose rates encountered when core sampling some radioactive waste tanks the addition of 240 lbs. of lead shielding is being considered to the shielded receiver tube on core sample trucks No.1, No.3 and No.4. The lead shielding is 4 inch diameter x 1/2 inch thick half rounds that have been installed around the SR tube over its' full length. Using three unreleased but independently reviewed structural analyses HNF-6018 justifies the addition of the lead shielding.

BOGER, R.M.

2000-04-11T23:59:59.000Z

235

Tubing-conveyed perforating cuts costs, boosts production  

Science Conference Proceedings (OSTI)

A new Attaka Field development program was started in November 1984 with the objective of reversing the field's declining production. The Intermediate and Deep sands were the reservoirs of interest since their abundance and large areal extent account for a large volume of oil and gas. Many factors contributed to the success of this program, particularly tubing conveyed perforating, (TCP) which has reduced completion time, formation damage and maximized well production. This article discusses the determination of proper underbalance, operational aspects of tubing conveyed perforating, cost comparisons between TCP and wireline methods and a comparison of skin factors resulting from underbalanced perforating and overbalanced perforating.

Sukmadjaja, T.; Shewchenko, D.; Ajam, S.O.

1988-05-01T23:59:59.000Z

236

Continuation of Studies on Development of ODS Heat Exchanger Tubing  

SciTech Connect

The Department of Energy (DOE), National Energy Technology Center (NETL), has initiated a strategic plan for the development of advanced technologies needed to design and build fossil fuel plants with very high efficiency and environmental performance. These plants, referred to as 'Vision 21' and FutureGen programs by DOE, will produce electricity, chemicals, fuels, or a combination of these products, and possibly secondary products such as steam/heat for industrial use. MA956 is a prime candidate material being considered for a high temperature heat exchanger in the 'Vision 21' and FutureGen programs. This material is an oxide dispersion strengthened (ODS) alloy; however, there are some gaps in the data required to commit to the use of these alloys in a full-size plant. To fill the technology gaps for commercial production and use of the material for 'Advanced Power Generation Systems' this project has performed development activity to significant increase in circumferential strength of MA956 as compared to currently available material, investigated bonding technologies for bonding tube-to-tube joints through joining development, and performed tensile, creep and fire-side corrosion tests to validate the use and fabrication processes of MA956 to heat exchanger tubing applications. Development activities within this projected has demonstrated increased circumferential strength of MA956 tubes through flow form processing. Of the six fabrication technologies for bonding tube-to-tube joints, inertia friction welding (IFW) and flash butt welding (FBW) were identified as processes for joining MA956 tubes. Tensile, creep, and fire-side corrosion test data were generated for both base metal and weld joints. The data can be used for design of future systems employing MA956. Based upon the positive development activities, two test probes were designed and fabricated for field exposure testing at 1204 C ({approx}2200 F) flue gas. The probes contained tube portions with FBW and IFW welded MA956. Field testing of the probes and remaining heat exchanger design activity will be performed by Oak Ridge National Laboratory under DOE Contract DE-AC05-00OR22725.

Lawrence Brown; David Workman; Bimal Kad; Gaylord Smith; Archie Robertson; Ian Wright

2008-04-15T23:59:59.000Z

237

Method and apparatus for remote tube crevice detection by current and voltage probe resistance measurement  

DOE Patents (OSTI)

A method and apparatus for determining the extent of contact between an electrically conducting tube and an electrically conductive tubesheet surrounding the tube, based upon the electrical resistance of the tube and tubesheet. A constant current source is applied to the interior of the electrically conducting tube by probes and a voltmeter is connected between other probes to measure the voltage at the point of current injection, which is inversely proportional to the amount of contact between the tube and tubesheet. Namely, the higher the voltage measured by the voltmeter, the less contact between the tube and tubesheet. 4 figs.

Kikta, T.J.; Mitchell, R.D.

1992-11-24T23:59:59.000Z

238

Quality-control gas-detector tube readers: optical versus observer  

SciTech Connect

The influence of temperature and humidity upon two length-of-stain gas detector tube systems was studied. Length-of-stain tubes were exposed under carefully controlled laboratory conditions, then read by a panel of observers and a newly developed optical tube reader. Data from the study show, generally, good correlation of results between the observer panel and the optical tube reader. Also, the data indicated that temperature and humidity calibration curves or tables were needed for several of the detector tubes. The two detector tube systems were comparable in reliability; however, for detecting a particular gas, one system may be selected over the other.

Carroll, H.B. Jr.

1976-12-01T23:59:59.000Z

239

Replacement of Mushroom Cage Gastrostomy Tube Using a Modified Technique to Allow Percutaneous Replacement with an Endoscopic Tube in Patients with Amyotrophic Lateral Sclerosis  

Science Conference Proceedings (OSTI)

Radiologic inserted gastrostomy (RIG) is the preferred method in our institution for enteral feeding in amyotrophic lateral sclerosis (ALS). Skin-level primary-placed mushroom cage gastrostomy tubes become tight with weight gain. We describe a minimally invasive radiologic technique for replacing mushroom gastrostomy tubes with endoscopic mushroom cage tubes in ALS. All patients with ALS who underwent replacement of a RIG tube were included. Patients were selected for a modified replacement when the tube length of the primary placed RIG tube was insufficient to allow like-for-like replacement. Replacement was performed under local anesthetic and fluoroscopic guidance according to a preset technique, with modification of an endoscopic mushroom cage gastrostomy tube to allow percutaneous placement. Assessment of the success, safety, and durability of the modified technique was undertaken. Over a 60-month period, 104 primary placement mushroom cage tubes in ALS were performed. A total of 20 (19.2%) of 104 patients had a replacement tube positioned, 10 (9.6%) of 104 with the modified technique (male n = 4, female n = 6, mean age 65.5 years, range 48-85 years). All tubes were successfully replaced using this modified technique, with two minor complications (superficial wound infection and minor hemorrhage). The mean length of time of tube durability was 158.5 days (range 6-471 days), with all but one patient dying with a functional tube in place. We have devised a modification to allow percutaneous replacement of mushroom cage gastrostomy feeding tubes with minimal compromise to ALS patients. This technique allows tube replacement under local anesthetic, without the need for sedation, an important consideration in ALS.

Ammar, Thoraya [King's College Hospital, Department of Radiology (United Kingdom); Rio, Alan [King's College Hospital, Department of Dietetics (United Kingdom); Ampong, Mary Ann [King's College Hospital, Department of Neurosciences (United Kingdom); Sidhu, Paul S., E-mail: paulsidhu@nhs.ne [King's College Hospital, Department of Radiology (United Kingdom)

2010-06-15T23:59:59.000Z

240

Fouling characteristics of compact heat exchangers and enhanced tubes.  

Science Conference Proceedings (OSTI)

Fouling is a complex phenomenon that (1) encompasses formation and transportation of precursors, and (2) attachment and possible removal of foulants. A basic understanding of fouling mechanisms should guide the development of effective mitigation techniques. The literature on fouling in complex flow passages of compact heat exchangers is limited; however, significant progress has been made with enhanced tubes.

Panchal, C. B.; Rabas, T. J.

1999-07-15T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Jefferson Lab Science Videos on YouTube  

DOE Data Explorer (OSTI)

Jefferson Lab, a DOE physics research lab located in Virgina, has approximately 100 lab-produced videos on YouTube. These include selected presentations from the Jefferson Lab Science Series, short clips of simple experiments for educational purposes, clips from Frostbite Theater, and clips from the Physics Out Loud series.

242

National Energy Technology Lab's Science Videos on YouTube  

DOE Data Explorer (OSTI)

In March of 2008, the National Energy Technology Laboratory began posting lab-produced videos on YouTube. Currently, there are more than 108 videos available, organized into seven playlists. Visit the Lab's website to view additional videos, including some scientific documentaries.

243

Extrusion of metal oxide superconducting wire, tube or ribbon  

DOE Patents (OSTI)

A process and apparatus for extruding a superconducting metal oxide composition YBa{sub 2}Cu{sub 3}O{sub 7-x} provides a wire (tube or ribbon) having a cohesive mass and a degree of flexibility together with enhanced electrical properties. Wire diameters in the range of 6--85 mils have been produced with smaller wires on the order of 10 mils in diameter exhibiting enhanced flexibility for forming braided, or multistrand, configurations for greater current carrying capacity. The composition for extrusion contains a polymeric binder to provide a cohesive mass to bind the particles together during the extrusion process with the binder subsequently removed at lower temperatures during sintering. The composition for extrusion further includes a deflocculent, an organic plasticizer and a solvent which also are subsequently removed during sintering. Electrically conductive tubing with an inner diameter of 52 mil and an outer diameter of 87--335 mil has also been produced. Flat ribbons have been produced in the range of 10--125 mil thick by 100--500 mil wide. The superconducting wire, tube or ribbon may include an outer ceramic insulating sheath co-extruded with the wire, tubing or ribbon.

Dusek, J.T.

1990-01-01T23:59:59.000Z

244

Heat Flux Electrochemical Studies of Underdeposit Boiler Tube Corrosion  

Science Conference Proceedings (OSTI)

Boiler water-side corrosion in fossil plants represents a key cause of availability loss and performance degradation, with underdeposit corrosion (UDC) being a major damage mechanism. UDC results from concentration of impurities and contaminants within the structure of the deposit residing on the heated internal surfaces of boiler waterwall tubing. The EPRI cycle chemistry guidelines provide control curves based on ...

2013-09-10T23:59:59.000Z

245

Rigid indented cylindrical cathode for X-ray tube  

DOE Patents (OSTI)

A cathode assembly for a vacuum tube includes a wire filament, a straight bular anode parallel to and surrounding the wire filament, and insulating spacers for rigidly fastening the filament with respect to the anode, and with one side of the anode indented or flattened such that only one portion of the anode is heated to emitting temperatures by the filament.

Hudgens, Claude R. (Dayton, OH)

1985-01-01T23:59:59.000Z

246

Extrusion of metal oxide superconducting wire, tube or ribbon  

DOE Patents (OSTI)

A process for extruding a superconducting metal oxide composition YBa.sub.2 Cu.sub.3 O.sub.7-x provides a wire (tube or ribbon) having a cohesive mass and a degree of flexibility together with enhanced electrical properties. Wire diameters in the range of 6-85 mils have been produced with smaller wires on the order of 10 mils in diameter exhibiting enhanced flexibility for forming braided, or multistrand, configurations for greater current carrying capacity. The composition for extrusion contains a polymeric binder to provide a cohesive mass to bind the particles together during the extrusion process with the binder subsequently removed at lower temperatures during sintering. The composition for extrusion further includes a deflocculent, an organic plasticizer and a solvent which also are subsequently removed during sintering. Electrically conductive tubing with an inner diameter of 52 mil and an outer diameter of 87-355 mil has also been produced. Flat ribbons have been produced in the range of 10-125 mil thick by 100-500 mil wide. The superconducting wire, tube or ribbon may include an outer ceramic insulating sheath co-extruded with the wire, tubing or ribbon.

Dusek, Joseph T. (Lombard, IL)

1993-01-01T23:59:59.000Z

247

Through-tubing whipstock to exit two casing strings  

Science Conference Proceedings (OSTI)

A specific need was identified on the Montrose platform in Amoco`s North Sea drilling operations for milling through 7-in. and 9-5/8-in. casing at 60{degree} inclination using coiled tubing. All equipment would be required to pass through 3.75-in. restrictions in the 4{1/2}-in. tubing completion string. This operation would be a first for the industry through these two casing strings using through-tubing whipstock technology. A variable-angle test fixture was designed and constructed at Amoco`s Drilling Technology Test Facility at Catoosa, Oklahoma. Available through-tubing whipstock systems from three service companies were evaluated, including: (1) TIW/The Red Baron--whipstock OD (3.67 in.), mill OD (3.75 in.), system designation (T); (2) Weatherford Enterra, Inc.--(3.75 in.), (3.75 in.), (W); and Baker Oil Tools--(3.625 in.), (3.70 in.), (B). Results are discussed.

Townsend, S.; Onyia, E.; King, G. [Amoco EPTG, Tulsa, OK (United States)

1997-05-01T23:59:59.000Z

248

Blogger ethics and YouTube common sense  

Science Conference Proceedings (OSTI)

As our students live more of their lives on the internet using sites such as Facebook, YouTube, personal blogs and Second Life, those of us in the older generations may need to rethink how we can better mentor them to become good web citizens. Recently ...

C. Dianne Martin

2007-12-01T23:59:59.000Z

249

Knot energy in unstretching ergodic magnetic flux tubes  

E-Print Network (OSTI)

Recently Titov et al [ApJ \\textbf{693},(2009) and ApJ (2007)] have made use of a covariant model to investigate magnetic reconnection of astrophysical plasmas. Earlier R Ricca [Phys Rev A (1991)] has used another covariant formalism, to investigated vortex filaments and solitons. This formalism, called Ricci rotation coefficients (RRC), is applied here, to the Chui and Moffatt [PRSA (1995)] knotted magnetic flux tube (MFT) Riemann metric in the case of vanishing stretch. It is shown that, the vanishing of some components of the (RRC) leads to unstretching knotted tubes. Computing of magnetic knot energy in terms of the RCC, shows that, uniform, unstretching and constant cross-section tubes leads to a marginal dynamo action over magnetic surfaces. Recent investigation on the role of stretching in plasma dynamo action showed that in diffusive media [Phys Plasma \\textbf{14} (2008)], unstretching unknotted tubes would not support fast dynamo action. This result was generalized here to much more general knotted MF...

de Andrade, Garcia

2009-01-01T23:59:59.000Z

250

Novel rotating field probe for inspection of tubes  

SciTech Connect

Inspection of steam generator tubes in nuclear power plants is extremely critical for safe operation of the power plant. In the nuclear industry, steam generator tube inspection using eddy current techniques has evolved over the years from a single bobbin coil, to rotating probe coil (RPC) and array probe, in an attempt to improve the speed and reliability of inspection. The RPC probe offers the accurate spatial resolution but involves complex mechanical rotation. This paper presents a novel design of eddy current probes based on rotating fields produced by three identical coils excited by a balanced three-phase supply. The sensor thereby achieves rotating probe functionality by electronic means and eliminates the need for mechanical rotation. The field generated by the probe is largely radial that result in induced currents that flow circularly around the radial axis and rotating around the tube at a synchronous speed effectively producing induced eddy currents that are multidirectional. The probe will consequently be sensitive to cracks of all orientations in the tube wall. The finite element model (FEM) results of the rotating fields and induced currents are presented. A prototype probe is being built to validate simulation results.

Xin, J.; Tarkleson, E.; Lei, N.; Udpa, L.; Udpa, S. S. [Nondestructive Evaluation Laboratory, Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI, 48824 (United States)

2012-05-17T23:59:59.000Z

251

Brookhaven National Laboratory's Science Videos on YouTube  

DOE Data Explorer (OSTI)

Brookhaven National Laboratory has posted more than seventy lab-produced videos on YouTube. Most are short clips that provide pithy insights into BNL's science, facilities, and community outreach activities. Visit Brookhaven's website to view lecture and seminar videos.

252

Videos from AMES Laboratory on YouTube  

DOE Data Explorer (OSTI)

Ames Lab created a channel on YouTube near the end of 2009. This collection of clips provides quick looks at some of the outreach activities, educational explanations of various research projects (presented by the researcher involved), and the 2010 State of the Lab Address by Ames Lab Director Alex King. Approximately 50 videos are currently available.

253

Argonne National Laboratory's Science Videos on YouTube  

DOE Data Explorer (OSTI)

Argonne National Laboratory has nearly 150 videos posted on YouTube. Their playlists include Argonne's Out Loud Lecture Series, videos directly related to Argonne's mission-driven science research, categories on energy, on the environment, and videos highlighting various facilities and programs.

254

Horizontal underbalanced drilling of gas wells with coiled tubing  

Science Conference Proceedings (OSTI)

Coiled tubing drilling technology is gaining popularity and momentum as a significant and reliable method of drilling horizontal underbalanced wells. It is quickly moving into new frontiers. To this point, most efforts in the Western Canadian Basin have been focused towards sweet oil reservoirs in the 900--1300 m true vertical depth (TVD) range, however there is an ever-increasing interest in deeper and gas-producing formations. Significant design challenges on both conventional and coiled tubing drilling operations are imposed when attempting to drill these formations underbalanced. Coiled tubing is an ideal technology for underbalanced drilling due to its absence of drillstring connections resulting in continuous underbalanced capabilities. This also makes it suitable for sour well drilling and live well intervention without the risk of surface releases of reservoir gas. Through the use of pressure deployment procedures it is possible to complete the drilling operation without need to kill the well, thereby maintaining underbalanced conditions right through to the production phase. The use of coiled tubing also provides a means for continuous wireline communication with downhole steering, logging and pressure recording devices.

Cox, R.J.; Li, J.; Lupick, G.S.

1999-03-01T23:59:59.000Z

255

Integrated Boiler Tube Failure Reduction/Cycle Chemistry Improvement Program  

Science Conference Proceedings (OSTI)

Boiler tube failures (BTF) and cycle chemistry corrosion and deposition problems remain the leading causes of availability losses in fossil-fired steam plants worldwide. This report describes techniques developed during a 20-year EPRI project to assist utilities in substantially reducing availability and performance losses due to these problems.

2006-05-16T23:59:59.000Z

256

Hand held sample tube manipulator, system and method  

Science Conference Proceedings (OSTI)

A manipulator apparatus, system and method for measuring analytes present in sample tubes. The manipulator apparatus includes a housing having a central bore with an inlet end and outlet end; a plunger mechanism with at least a portion thereof slideably disposed for reciprocal movement within the central bore, the plunger mechanism having a tubular gas channel with an inlet end and an outlet end, the gas channel inlet end disposed in the same direction as said inlet end of the central bore, wherein the inlet end of said plunger mechanism is adapted for movement so as to expel a sample tube inserted in the bore at the outlet end of the housing, the inlet end of the plunger mechanism is adapted for connection to gas supply; a first seal is disposed in the housing for sealing between the central bore and the plunger mechanism; a second seal is disposed at the outlet end of the housing for sealing between the central bore and a sample tube; a holder mounted on the housing for holding the sample tube; and a biasing mechanism for returning the plunger mechanism to a starting position.

Kenny, Donald V. (Liberty Township, OH); Smith, Deborah L. (Liberty Township, OH); Severance, Richard A. (late of Columbus, OH)

2001-01-01T23:59:59.000Z

257

Postirradiation examination of pressure tubes 2954 and 3053: Corrosion, hydriding and fluence measurements  

Science Conference Proceedings (OSTI)

Pressure Tubes 2954 and 3053 were removed from N Reactor in March 1987 for postirradiation examinations (PIE) including hydriding, corrosion, fluence and mechanical property measurements. The results of the corrosion, hydriding, and fluence measurements are the subject of this report. These data will be used to evaluate the trends in corrosion and hydriding behavior which are important to the structural integrity of these tubes. The trend evaluations as well as the mechanical property data are or will be reported elsewhere. Both tubes operated at high power accumulating 101,800 hours of service since reactor startup in 1964. Fabricated by the Harvey Aluminum Company, Tube 2954 was cold drawn to 30% reduction of area as were 86% of the reactor tubes. Tube 3053 was also a Harvey Tube but was cold worked 18% representing 2.5% of the reactor tubes. Corrosion measurements were made from metallographic sections. The inner surface oxide thickness peaks at 2 to 5 ft downstream of the center of the fueled zone. This profile is typical of previous examined N Reactor pressure tubes. The maximum measured oxide thickness on tube 2954 was 64 microns, 17% greater than for tubes removed in 1984. The corrosion product hydrogen that is absorbed by the tube has distribution gradients in the azimuthal, axial, and radial directions. Radical surveys confirmed previous observations that most of the hydrogen is concentrated near the tube ID surfaces. For Tubes 2954 and 3053, 50% to 80% of the hydrogen is found in 20% of the tube wall. The radial as well as the azimuthal gradients are caused by thermal gradients in the tubes, with the hydrogen redistributing to the cooler parts of the tube wall. 6 refs., 50 figs., 2 tabs.

Chastain, S.A.; Trimble, D.J.; Boyd, S.M.

1988-06-01T23:59:59.000Z

258

Vertical-tube aqueous LiBr falling film absorption using advanced surfaces  

SciTech Connect

A heat and mass transfer test stand was fabricated and used to investigate nonisothermal falling film absorption of water vapor into a solution of aqueous lithium bromide. The absorber was made of borosilicate glass for visual inspection of the failing film. Experiments were conducted on internally cooled tubes of about 0.019 m outside diameter and of 1.53 m length. Testing evaluated a single absorber tube`s performance at varying operating conditions, namely different cooling-water flow rates, solution flow rates, pressures, temperatures, and concentrations. Advanced surfaces were identified that enhanced absorber load and the mass of absorbed vapor. A pin-fin tube with 6.4mm pitch absorbed about 225% more mass than did a smooth tube. A grooved tube was the d best performer with 175% enhancement over the smooth tube. Increasing the cooling water flow rate to 1.893 {times} 10{sup {minus}4} m{sup 3}/s caused about a 300% increase in the mass absorbed for the grooved tube compared with the smooth tube. Results showed that the pin-fin tube with 6.4-mm pitch and the grooved tubes may enhance absorption to levels comparable to chemical enhancement in horizontal smooth tube absorbers. Absorber load, the transport coefficients, and pertinent absorption data are presented as functions of dimensionless numbers. These experimental data will prove useful in formulating analytical tools to predict vertical-tube absorber performance.

Miller, W.A. [Oak Ridge National Lab., TN (United States); Perez-Blanco, H. [Pennsylvania State Univ., University Park, PA (United States)

1993-10-01T23:59:59.000Z

259

Boiler Tube Corrosion Characterization With a Scanning Thermal Line  

E-Print Network (OSTI)

Wall thinning due to corrosion in utility boiler waterwall tubing is a significant operational concern for boiler operators. Historically, conventional ultrasonics has been used for inspection of these tubes. Unfortunately, ultrasonic inspection is very manpower intense and slow. Therefore, thickness measurements are typically taken over a relatively small percentage of the total boiler wall and statistical analysis is used to determine the overall condition of the boiler tubing. Other inspection techniques, such as electromagnetic acoustic transducer (EMAT), have recently been evaluated, however they provide only a qualitative evaluation - identifying areas or spots where corrosion has significantly reduced the wall thickness. NASA Langley Research Center, in cooperation with ThermTech Services, has developed a thermal NDE technique designed to quantitatively measure the wall thickness and thus determine the amount of material thinning present in steel boiler tubing. The technique involves the movement of a thermal line source across the outer surface of the tubing followed by an infrared imager at a fixed distance behind the line source. Quantitative images of the material loss due to corrosion are reconstructed from measurements of the induced surface temperature variations. This paper will present a discussion of the development of the thermal imaging system as well as the techniques used to reconstruct images of flaws. The application of the thermal line source coupled with the analysis technique represents a significant improvement in the inspection speed and accuracy for large structures such as boiler waterwalls. A theoretical basis for the technique will be presented to establish the quantitative nature of the technique. Further, a dynamic calibration system ...

Elliott Cramer National; K. Elliott Cramer; Langley Blvd; Ronald Jacobstein; Thomas Reilly

2001-01-01T23:59:59.000Z

260

AUTOMATED WATER LEVEL MEASUREMENTS IN SMALL-DIAMETER AQUIFER TUBES  

Science Conference Proceedings (OSTI)

Groundwater contaminated with hexavalent chromium, strontium-90, and uranium discharges into the Columbia River along approximately 16 km (10 mi) of the shoreline. Various treatment systems have and will continue to be implemented to eliminate the impact of Hanford Site contamination to the river. To optimize the various remediation strategies, it is important to understand interactions between groundwater and the surface water of the Columbia River. An automated system to record water levels in aquifer sampling tubes installed in the hyporheic zone was designed and tested to (1) gain a more complete understanding of groundwater/river water interactions based on gaining and losing conditions ofthe Columbia River, (2) record and interpret data for consistent and defensible groundwater/surface water conceptual models that may be used to better predict subsurface contaminant fate and transport, and (3) evaluate the hydrodynamic influence of extraction wells in an expanded pump-and-treat system to optimize the treatment system. A system to measure water levels in small-diameter aquifer tubes was designed and tested in the laboratory and field. The system was configured to allow manual measurements to periodically calibrate the instrument and to permit aquifer tube sampling without removing the transducer tube. Manual measurements were collected with an e-tape designed and fabricated especially for this test. Results indicate that the transducer system accurately records groundwater levels in aquifer tubes. These data are being used to refine the conceptual and numeric models to better understand interactions in the hyporheic zone of the Columbia River and the adjacent river water and groundwater, and changes in hydrochemistry relative to groundwater flux as river water recharges the aquifer and then drains back out in response to changes in the river level.

PETERSEN SW; EDRINGTON RS; MAHOOD RO; VANMIDDLESWORTH PE

2011-01-14T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

The effect of roughness on aerosol deposition in tubes  

E-Print Network (OSTI)

Experimental measurements of simulated roughness within tubes and the subsequent aerosol penetration performance through these tubes were conducted for a aerosol particle size range of 5 nm to 20 nm and a flow rate range of 28 L/min to 169.9 L/min. The relative roughness for each of the tubes tested are as follows: clean aluminum pipe and clean copper tube, F,/D = 10-4; fine sandpaper pipe, F,/D = 0.017-12 helical ridges per linear centimeter copper tube, F,/D = 0.046; coarse sandpaper pipe, F,/D = 0.065. Non-dimensional quantities were used to produce an empirical model relating roughness to aerosol penetration. The dependent variable, aerosol penetration, was encompassed in the non-dimensional deposition velocity (v,) and modeled as a function of the dependent variables, non-dimensional particle relaxation time (,c,) and relative roughness (&/D). In addition, a method was developed for estimating when to remove the sampling transport lines for cleaning due to the roughness within the transport line. The empirical correlation fits the data over the range of 0. I 6 to 112 L/min. For these conditions, the model deviated from the experimental data by less than 10% with one outlier which deviated by 20% for the coarse sandpaper pipe at a flow rate of 1 12 L/min. The correlation was used to show that the transport lines should be removed for cleaning or replacement once the pressure drop has exceeded 7.5 mm Hg. The experimental data has shown that the aerosol penetration decreases below 85% for an internal roughness comparable to this pressure drop limit. The correlation for aerosol penetration in transport lines with internal roughness presented should be a beneficial engineering tool for predicting the aerosol losses in sampling systems where roughness is a concern. The correlation should be a useful sub-model for aerosol penetration prediction computational tools as well.

Chavez, Mario Cesar

1997-01-01T23:59:59.000Z

262

On deforming a sector of a circular cylindrical tube into an intact tube: existence, uniqueness, and stability  

E-Print Network (OSTI)

Within the context of finite deformation elasticity theory the problem of deforming an open sector of a thick-walled circular cylindrical tube into a complete circular cylindrical tube is analyzed. The analysis provides a means of estimating the radial and circumferential residual stress present in an intact tube, which is a problem of particular concern in dealing with the mechanical response of arteries. The initial sector is assumed to be unstressed and the stress distribution resulting from the closure of the sector is then calculated in the absence of loads on the cylindrical surfaces. Conditions on the form of the elastic strain-energy function required for existence and uniqueness of the deformed configuration are then examined. Finally, stability of the resulting finite deformation is analyzed using the theory of incremental deformations superimposed on the finite deformation, implemented in terms of the Stroh formulation. The main results are that convexity of the strain energy as a function of a certain deformation variable ensures existence and uniqueness of the residually-stressed intact tube, and that bifurcation can occur in the closing of thick, widely opened sectors, depending on the values of geometrical and physical parameters. The results are illustrated for particular choices of these parameters, based on data available in the biomechanics literature.

Micehl Destrade; Jerry G. Murphy; Ray W. Ogden

2013-01-22T23:59:59.000Z

263

Thermal Nondestructive Characterization of Corrosion in Boiler Tubes by Application of a Moving Line Heat Source  

Science Conference Proceedings (OSTI)

Wall thinning in utility boiler waterwall tubing is a significant inspection concern for boiler operators. Historically, conventional ultrasonics has been used for inspection of these tubes. This technique has proved to be very labor intensive and slow. ...

Cramer K. Elliott; Winfree William P.

2000-01-01T23:59:59.000Z

264

Tube vibration in industrial-size test heat exchanger (90/sup 0/ square layout)  

SciTech Connect

Tube vibrations in heat exchangers are being systematically investigated in a series of tests performed with an industrial-size test exchanger. Results from waterflow tests of eleven different tube bundles, in six- and eight-crosspass configurations on a 90/sup 0/ square layout with a pitch-to-diameter ratio of 1.25 are reported. The test cases include full tube bundles, no-tubes-in-window bundles, finned tube bundles, and proposed field and design fixes. The testing focused on identification of the lowest critical flowrate to initiate fluidelastic instability (large amplitude tube motion) and the location within the bundle of the tubes which first experience instability. The test results are tabulated to permit comparison with results obtained from previous tests with a 30/sup 0/ triangular layout tube bundle. Instability criteria are evaluated preliminarily. Pressure drop data are also generated and reported.

Halle, H.; Wambsganss, M.W.

1983-02-01T23:59:59.000Z

265

Analysis and restoration of a 1960s ear vacuum tube AM-FM reflex receiver  

E-Print Network (OSTI)

This thesis details the analysis, restoration, and evaluation of a 1960s era vacuum tube AM-FM reflex receiver. External influences such as tax laws necessitated clever designs to minimize the use of expensive vacuum tubes ...

Golden, Adam J

2004-01-01T23:59:59.000Z

266

Investigation of heat transfer augmentation through use of internally finned and roughened tubes : final summary report  

E-Print Network (OSTI)

This report summarizes a three-year program concerned with obtaining basic design information for tubes having a random roughness on the inside wall (RID) and tubing having continuous internal fins (Forge Fin). Test apparatus ...

Bergles A. E.

1970-01-01T23:59:59.000Z

267

Progress in Development of a Miniature Pulse Tube Cooler for Space Applications  

Science Conference Proceedings (OSTI)

A pulse tube cryocooler is under development for high?reliability spacecraft applications. Recent developments in the assembly and verification of a Miniature Pulse Tube Cooler (MPTC) are presented

A. S. Gibson; R. Hunt; I. Charles; L. Duband; M. R. Crook; A. H. Orlowska; T. W. Bradshaw; M. Linder

2004-01-01T23:59:59.000Z

268

Safety and availabili of steam generator tubes affected by secondary side corrosion  

E-Print Network (OSTI)

ELSEVIER Nuclear Engimering andDesign Safety and availabili of steam generator tubes affected the dominatingageingme&mism is. steam generator tubes made 61Iw0d 600.A variety of maiuttnanGe approacheswre developadand

Cizelj, Leon

269

Film boiling of saturated liquid flowing upward through a heated tube : high vapor quality range  

E-Print Network (OSTI)

Film boiling of saturated liquid flowing upward through a uniformly heated tube has been studied for the case in which pure saturated liquid enters the tube and nearly saturated vapor is discharged. Since a previous study ...

Laverty, W. F.

1964-01-01T23:59:59.000Z

270

Mitigation of Boiler Tubing Damage from Use of Explosive Cleaning Methods  

Science Conference Proceedings (OSTI)

Combustion of fossil fuels results in formation of slags that cover boiler tubes. Efficient boiler operation requires periodic removal of these slags, and explosive cleaning is an excellent cleaning method. While boiler tube cleaning using explosives is an established technology, a number of cases of tube damage have been reported, including cracking and denting of boiler tubes. This report details the work accomplished in Phase I of this project to capture the current understanding and practice of explo...

2008-01-01T23:59:59.000Z

271

A Transformer Coupling Method for Imaging Defects in Concentrically Arranged Steel Tubes  

Science Conference Proceedings (OSTI)

This paper describes the development of a system that uses a transformer coupling method for imaging defects in the outer tube of a concentric steel tube pair. Transformer coupling is employed where a receiver is mounted opposite to the transmitter. Magnetic field coupling is used, in which the field propagates through the inner steel tube towards the outer steel tube. Defects in the outer section distort the field and the change is detected by the receiver.

Miller, G.; Hussin, H.; Fernandes, B.; Zaid, M.; Gaydecki, P.; El-Madaani, F. [School of Electrical and Electronic Engineering, University of Manchester, PO Box 88, Manchester M60 1QD (United Kingdom)

2006-03-06T23:59:59.000Z

272

Superheater Tube Corrosion in Wood Gasifier Ash Deposits  

DOE Green Energy (OSTI)

The upper operating temperature of tubes in heat exchangers/steam generators is strongly influenced by the degradation that can occur because of the reaction of the exchanger/generator tubing with the deposits that accumulate on the surface of the tubes. In fact, severe corrosion has been observed in some biomass fired systems, particularly with elevated potassium and chlorine concentrations in the deposits. Wood gasifiers have recently been and are currently being constructed at several sites in North America. In these systems, the syngas is burned to produce steam and the performance of the heat exchanger tubes under ash deposits is of great concern. As temperatures of the heat exchangers are increased in an effort to increase their operating efficiency, the performance of the tubes is of greater interest. The corrosion behavior of alloy steel tubes as a function of temperature has been investigated by exposing samples of selected alloys to ash collected from the steam generator fired by syngas produced in wood gasifiers. This study compares corrosion rates from laboratory exposures of synthesis gas and ash at 500 C and 600 C. This study investigated the material performance of four ferritic steels and one austenitic steel exposed to conditions expected on the fireside of a wood gasifier. The purpose of this study was to identify an effective method for determining material performance for samples exposed to both the process gas and the fly ash that is typically observed within the steam generator for times up to 1000 hours. Mass changes were measured for all of the samples, but this information can be misleading concerning material performance due to the difficulty in sufficiently cleaning the samples after exposure in the ash. Therefore, small cross sections of the samples were collected and imaged using optical microscopy. Oxide thicknesses were measured along with metal losses. The metal loss information provides a clear indication of material performance. The metal loss rates for the ferritic steels at 500 C were almost half of those observed at 600 C and the rates decreased with increasing exposure time. It was also reported that the metal loss rates generally decrease with increasing chromium concentration.

Bestor, Michael A [ORNL; Keiser, James R [ORNL; Meisner, Roberta A [University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)

2011-01-01T23:59:59.000Z

273

Portals to an Architecture: Design of a temporary structure with paper tube arches Steven J. Preston  

E-Print Network (OSTI)

containers and large paper tubes to create a 56,000 square- foot (5200 square-meter) space [10]. In 2008, and low cost. Spirally wound paper tubes are highly engineered structural products made of different for both per- manent and temporary structures. Less frequently, paper tubes have been utilized in curved

Bank, Lawrence C.

274

Film condensation of R-113 on in-line bundles of horizontal finned tubes  

Science Conference Proceedings (OSTI)

Film condensation of R-113 on in-line bundles of horizontal finned tubes with vertical vapor downflow was experimentally investigated. Two tubes with flat-sided annular fins and four tubes with three-dimensional fins were tested. The test sections were 3 {times} 15 tube bundles with and without two rows of inundation tubes at the top. Heat transfer measurements were carried out on a row-by-row basis. The heat transfer enhancement due to vapor shear was much less for a finned tube bundle than for a smooth tube bundle. The decrease in heat transfer due to condensate inundation was more marked for a three-dimensional fin tube than for a flat-sided fin tube. The predictions of the previous theoretical model for a bundle of flat-sided fin tubes agreed well with the measured data for low vapor velocity and a small to medium condensate inundation rate. Among the six tubes tested, the highest heat transfer performance was provided by the flat-sided fin tube with fin dimensions close to the theoretically determined optimum values.

Honda, H. (Kyushu Univ., Fukuoka (Japan)); Uchima, B.; Nozu, S.; Nakata, H.; Torigoe, E. (Okayama Univ. (Japan))

1991-05-01T23:59:59.000Z

275

NONSTEADY-STATE HEAT TRANSFER UPON SHOCK WAVE REFLECTION IN A SHOCK TUBE  

E-Print Network (OSTI)

NONSTEADY-STATE HEAT TRANSFER UPON SHOCK WAVE REFLECTION IN A SHOCK TUBE V. P. Provotorov and V. V. Ryabov UDC 533.6.011 In recent years shock tubes have become widely used to study thermo- and gas]ne thermal boundary layer near the shock tube face was studied to determine the dependence of thermal

Riabov, Vladimir V.

276

Steam Generator Management Program: Pressurized Water Reactor Generic Tube Degradation Predictions: Recirculating Steam Generators with Alloy 600TT, Alloy 690TT, and Alloy 800NG Tubing  

Science Conference Proceedings (OSTI)

Mill-annealed Alloy 600 heat transfer tubing in pressurized water reactor (PWR) steam generators (SGs) has experienced numerous modes of degradation. This report describes predictive models for determining expected tube degradation in recirculating steam generators with Alloy 600TT, Alloy 690TT, and Alloy 800NG tubing. Predictions are based on operating experience with similar designs and use improvement factors to characterize benefits resulting from SG design and material ...

2013-12-17T23:59:59.000Z

277

Procedural design considerations associated with tubing-conveyed underbalanced perforating  

Science Conference Proceedings (OSTI)

Thirty-two tubing conveyed underbalanced perforating jobs conducted in the Gulf of Mexico between May, 1980, and May, 1982, have been carefully reviewed in order to draw correlations between procedural variations and trouble prone jobs. General procedural guidelines designed to avoid past problems were formulated and are presented. The procedures are designed for the generalized case where the perforating guns will be pulled out of the well in order to gravel pack and not for those run as part of a permanent completion. Careful application of these procedural guidelines has resulted in reducing rig time requirements by an average of 35% on 33 additional tubing conveyed underbalanced perforating jobs conducted subsequent to the establishment of the guidelines contained in this paper.

Young, W.S.; Zaleski, T.E.

1985-03-01T23:59:59.000Z

278

Technology for the Examination of Boiler Tubing Dissimilar Metal Welds  

Science Conference Proceedings (OSTI)

In an effort to determine the optimum method for examination of fossil power plant dissimilar metal boiler tube welds, researchers obtained several samples removed from service, and applied various ultrasonic examination technology to these samples. The welds in these samples were made with either austenitic stainless steel weld metal or by the induction pressure method. The welds were then subjected to conventional and advanced ultrasonic examination in the laboratory. For all examination methods, there...

2011-12-07T23:59:59.000Z

279

PREDICTION OF OXIDE SCALE EXFOLIATION IN STEAM TUBES  

SciTech Connect

Numerical simulation results are presented for the prediction of the likelihood of oxide scale exfoliation from superheater tubes. The scenarios considered involved alloys T22, TP347H, and TP347HFG subjected to a simplified operating cycle in a power plant generating supercritical steam. The states of stress and strain of the oxides grown in steam were based solely on modeling the various phenomena experienced by superheater tubes during boiler operation, current understanding of the oxidation behavior of each alloy in steam, and consideration of operating parameters such as heat flux, tube dimensions, and boiler duty cycle. Interpretation of the evolution of strain in these scales, and the approach to conditions where scale failure (hence exfoliation) is expected, makes use of the type of Exfoliation Diagrams that incorporate various cracking and exfoliation criteria appropriate for the system considered. In these diagrams, the strain accumulation with time in an oxide is represented by a strain trajectory derived from the net strain resulting from oxide growth, differences in coefficients of thermal expansion among the components, and relaxation due to creep. It was found that an oxide growing on a tube subjected to routine boiler load cycling conditions attained relatively low values of net strain, indicating that oxide failure would not be expected to occur during normal boiler operation. However, during a boiler shut-down event, strains sufficient to exceed the scale failure criteria were developed after times reasonably in accord with plant experience, with the scales on the ferritic steel failing in tension, and those on the austenitic steels in compression. The results presented illustrate that using this approach to track the state of strain in the oxide scale through all phases of boiler operation, including transitions from full-to-low load and shut-down events, offers the possibility of identifying the phase(s) of boiler operation during which oxide failure is most likely to occur.

Sabau, Adrian S [ORNL; Wright, Ian G [ORNL

2010-01-01T23:59:59.000Z

280

Maine Yankee steam generator tube modification from a radiobiological prospective  

SciTech Connect

Maine Yankee installed permanent sleeving in the primary secondary interface tubing of their steam generators. This repair was necessary because of numerous defects approaching or exceeding technical specification requirements. This project was accomplished under budget, and for a radiation exposure of 141.974 person-rem. This paper addresses the ALARA considerations, temporary lead shielding, mockup training, radiation worker training, radiological initiatives, and lessons learned.

Heath, E.; Granados, B. [Maine Yankee, Wiscasset, MA (United States)

1996-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Rotor for processing liquids using movable capillary tubes  

DOE Patents (OSTI)

A rotor assembly for processing liquids, especially whole blood samples, is disclosed. The assembly includes apparatus for separating non-liquid components of whole blood samples from liquid components, apparatus for diluting the separated liquid component with a diluent and apparatus for transferring the diluted sample to an external apparatus for analysis. The rotor assembly employs several movable capillary tubes to handle the sample and diluents. A method for using the rotor assembly to process liquids is also described.

Johnson, Wayne F. (Loudon, TN); Burtis, Carl A. (Oak Ridge, TN); Walker, William A. (Knoxville, TN)

1989-05-30T23:59:59.000Z

282

Rotor for processing liquids using movable capillary tubes  

DOE Patents (OSTI)

A rotor assembly for processing liquids, especially whole blood samples, is disclosed. The assembly includes apparatus for separating non-liquid components of whole blood samples from liquid components, apparatus for diluting the separated liquid component with a diluent and apparatus for transferring the diluted sample to an external apparatus for analysis. The rotor assembly employs several movable capillary tubes to handle the sample and diluents. A method for using the rotor assembly to process liquids is also described. 5 figs.

Johnson, W.F.; Burtis, C.A.; Walker, W.A.

1987-07-17T23:59:59.000Z

283

Rotor for processing liquids using movable capillary tubes  

DOE Patents (OSTI)

A rotor assembly for processing liquids, especially whole blood samples, is disclosed. The assembly includes apparatus for separating non-liquid components of whole blood samples from liquid components, apparatus for diluting the separated liquid component with a diluent and apparatus for transferring the diluted sample to an external apparatus for analysis. The rotor assembly employs several movable capillary tubes to handle the sample and diluents. A method for using the rotor assembly to process liquids is also described.

Johnson, Wayne F. (Loudon, TN); Burtis, Carl A. (Oak Ridge, TN); Walker, William A. (Knoxville, TN)

1989-01-01T23:59:59.000Z

284

Low Power Photomultiplier Tube Circuit And Method Thereor  

DOE Patents (OSTI)

An electrical circuit for a photomultiplier tube (PMT) is disclosed that reduces power consumption to a point where the PMT may be powered for extended periods with a battery. More specifically, the invention concerns a PMT circuit comprising a low leakage switch and a high voltage capacitor positioned between a resistive divider and each of the PMT dynodes, and a low power control scheme for recharging the capacitors.

Bochenski, Edwin B. (Tracy, CA); Skinner, Jack L. (Brentwood, CA); Dentinger, Paul M. (Sunol, CA); Lindblom, Scott C. (Tracy, CA)

2006-04-18T23:59:59.000Z

285

Stress Relief Treatment of Alloy 600 Steam Generator Tubing  

Science Conference Proceedings (OSTI)

Various time-temperature combinations may hold potential for improving the resistance of tubesheet transition regions to intergranular stress corrosion cracking (IGSCC). EPRI has discovered that the most significant enhancement in IGSCC of Alloy 600 steam generator tubing occurs with stress relief heat treatments administered in the range of 550-610 degrees Celsius for an average of nine hours. Treatments administered for shorter times at temperatures greater than 700 degrees Celsius also proved effective.

1994-03-05T23:59:59.000Z

286

Pacific Northwest Lab's Science Videos on YouTube  

DOE Data Explorer (OSTI)

Pacific Northwest National Laboratory has posted more than 100 videos on its YouTube channel. The videos have been organized into eleven playlists. The Basic Science playlist includes presentations such as: 1) Microbial Communities Initiative - Melding Technology, Experimentation, and Theory by Alan Konopka; 2) Yellowstone Hot Spring Microbial Mats as Natural Models for Systems Microbiology and Biofuel Development by David Ward; 3) Why Microbial Communities by Jim Fredrickson. These were part of the 2009 symposium Microbial Communities: Stewards of the Universe.

287

Information Resources: CALiPER: Troffers, Kits, and Tubes  

NLE Websites -- All DOE Office Websites (Extended Search)

CALiPER: Troffers, Kits, and Tubes CALiPER: Troffers, Kits, and Tubes This June 20, 2013 webcast reviewed the recently completed CALiPER Exploratory Study, Recessed Troffer Lighting, in which a group of lighting designers, engineers, and facility managers compared the performance of conventional fluorescent troffers with T8 LED tube retrofits, LED retrofit kits, and dedicated LED troffers. Troffers (1'×4', 2'×2', and 2'×4') comprise more than half of all luminaires installed in commercial applications, so switching to LED technology has the potential to yield significant energy and environmental benefits. During the webcast, Naomi Miller of Pacific Northwest National Laboratory explored troffer lighting as used in office and classroom spaces, and discussed not only documented performance in measures that go beyond illuminance and luminaire efficacy, but also new design considerations for LED troffers and LED retrofit products, and the kinds of testing and certification to look for in order to get the best results from these products.

288

The Vetter-Sturtevant Shock Tube Problem in KULL  

SciTech Connect

The goal of the EZturb mix model in KULL is to predict the turbulent mixing process as it evolves from Rayleigh-Taylor, Richtmyer-Meshkov, or Kelvin-Helmholtz instabilities. In this report we focus on an example of the Richtmyer-Meshkov instability (which occurs when a shock hits an interface between fluids of different densities) with the additional complication of reshock. The experiment by Vetter & Sturtevant (VS) [1], involving a Mach 1.50 incident shock striking an air/SF{sub 6} interface, is a good one to model, now that we understand how the model performs for the Benjamin shock tube [2] and a prototypical incompressible Rayleigh-Taylor problem [3]. The x-t diagram for the VS shock tube is quite complicated, since the transmitted shock hits the far wall at {approx}2 millisec, reshocks the mixing zone slightly after 3 millisec (which sets up a release wave that hits the wall at {approx}4 millisec), and then the interface is hit with this expansion wave around 5 millisec. Needless to say, this problem is much more difficult to model than the Bejamin shock tube.

Ulitsky, M S

2005-10-06T23:59:59.000Z

289

Modelling Sawing of Metal Tubes Through FEM Simulation  

SciTech Connect

The paper presents the development of a numerical model of the sawing process of AISI 304 thin tubes, which is cut through a circular blade with alternating roughing and finishing teeth. The numerical simulation environment is the three-dimensional FEM software Deform v.10.1. The teeth actual trajectories were determined by a blade kinematics analysis developed in Matlab. Due to the manufacturing rolling steps and subsequent welding stage, the tube material is characterized by a gradient of properties along its thickness. Consequently, a simplified cutting test was set up and carried out in order to identify the values of relevant material parameters to be used in the numerical model. The dedicated test was the Orthogonal Tube Cutting test (OTC), which was performed on an instrumented lathe. The proposed numerical model was validated by comparing numerical results and experimental data obtained from sawing tests carried out on an industrial machine. The following outputs were compared: the cutting force, the chip thickness, and the chip contact area.

Bort, C. M. Giorgio; Bosetti, P.; Bruschi, S. [Department of Mechanical and Structural Engineering, University of Trento, via Mesiano 77, 38123 Trento (Italy)

2011-05-04T23:59:59.000Z

290

Solar evacuated tube collector: absorption chiller systems simulation  

DOE Green Energy (OSTI)

A residential air conditioning system incorporating an Arkla Solaire absorption chiller and Corning Glass Works evacuated tube collectors is simulated and the design parameters studied. Mathematical models of the evacuated tube collector and Arkla absorption chiller based on experimental results of the components have been created and incorporated into a complete system simulation. The chiller model includes transient start-up effects and the evacuated tube collector model includes numerous optical effects. A standard Arkla chiller in a humid climate (Washington, D.C.) and an Arkla unit with a modified charge for dry climates (Fort Collins, Colorado) are studied. Design parameters considered include the use of chilled water storage to reduce transient start-up effects of the absorption unit, the effects of removing heat from the solar system for preheating service hot water, the use of a tempering valve to prevent over-firing of the absorption unit in dry climates, and solar storage sizing considerations. The study results and conclusions are used to specify a cooling system design.

Leflar, J.A.; Duff, W.S.

1977-12-01T23:59:59.000Z

291

Direct Measurements of Pore Fluid Density by Vibrating Tube Densimetry  

Science Conference Proceedings (OSTI)

The densities of pore-confined fluids were measured for the first time by means of a vibrating tube method. Isotherms of total adsorption capacity were measured directly making the method complementary to the conventional gravimetric or volumetric/piezometric adsorption techniques, which yield the excess adsorption (the Gibbsian surface excess). A custom-made high-pressure, high-temperature vibrating tube densimeter (VTD) was used to measure the densities of subcritical and supercritical propane (between 35 C and 97 C) and supercritical carbon dioxide (between 32 C and 50 C) saturating hydrophobic silica aerogel (0.2 g/cm3, 90% porosity) synthesized inside Hastelloy U-tubes. Additionally, excess adsorption isotherms for supercritical CO2 and the same porous solid were measured gravimetrically using a precise magnetically-coupled microbalance. Pore fluid densities and total adsorption isotherms increased monotonically with increasing density of the bulk fluid, in contrast to excess adsorption isotherms, which reached a maximum at a subcritical density of the bulk fluid, and then decreased towards zero or negative values at supercritical densities. Compression of the confined fluid significantly beyond the density of the bulk liquid at the same temperature was observed at subcritical temperatures. The features of the isotherms of confined fluid density are interpreted to elucidate the observed behavior of excess adsorption. The maxima of excess adsorption were found to occur below the critical density of the bulk fluid at the conditions corresponding to the beginning of the plateau of total adsorption, marking the end of the transition of pore fluid to a denser, liquid-like pore phase. The results for propane and carbon dioxide showed similarity in the sense of the principle of corresponding states. No measurable effect of pore confinement on the liquid-vapor critical point was found. Quantitative agreement was obtained between excess adsorption isotherms determined from VTD total adsorption results and those measured gravimetrically at the same temperature, confirming the validity of the vibrating tube measurements. Vibrating tube densimetry was demonstrated as a novel experimental approach capable of providing the average density of pore-confined fluids.

Gruszkiewicz, Miroslaw {Mirek} S [ORNL; Rother, Gernot [ORNL; Wesolowski, David J [ORNL; Cole, David R [ORNL; Wallacher, Dirk [Helmholtz-Zentrum Berlin

2012-01-01T23:59:59.000Z

292

An in-bed tube bank for a fluidized-bed combustor  

DOE Patents (OSTI)

Fluidized-bed combustors have long been used to facilitate the combustion of low-quality fuels and more recently as a means for the clean burning of coal. In a fluidized-bed combustor fuel is fed into a bed of reactive or inert particulate material while air is injected into the bed and passed up through the bed, causing the bed material to act like a turbulent fluid. Where the combustor is utilized for steam generating one or more boiler tubes are positioned so as to span the bed while submerged in the bed, and as fuel is burned within the bed water is injected into the boiler tubes and heated, thereby generating steam. An in-bed tube bank is described for a fluidized bed combustor. The tube bank of the present invention comprises one or more fluid communicating boiler tubes which define a plurality of selectively spaced boiler tube sections. The tube sections are substantially parallel to one another and aligned in a common plane. The tube bank further comprises support members for joining adjacent tube sections, the support members engaging and extending along a selected length of the tube sections and spanning the preselected space there between 4 figs.

Hemenway, L.F. Jr.

1989-08-08T23:59:59.000Z

293

Particle seeding flow system for horizontal shock tube  

Science Conference Proceedings (OSTI)

The Extreme Fluids Team in P-23, Physics Division, studies fluid dynamics at high speeds using high resolution diagnostics. The unsteady forces on a particle driven by a shock wave are not well understood, and they are difficult to model. A horizontal shock tube (HST) is being modified to collect data about the behavior of particles accelerated by shocks. The HST has been used previously for studies of Richtmyer-Meshkov instability using Planar Laser-Induced Fluorescence (PLIF) as well as Particle Image Velocimetry (PIV), diagnostics that measure density and velocity. The purpose of our project is to design a flow system that will introduce particles into the HST. The requirements for this particle flow system (PFS) are that it be non-intrusive, be able to introduce either solid or liquid particles, have an exhaust capability, not interfere with existing diagnostics, and couple with the existing HST components. In addition, the particles must flow through the tube in a uniform way. We met these design criteria by first drawing the existing shock tube and diagnostics and doing an initial design of the ducts for the PFS. We then estimated the losses through the particle flow system from friction and researched possible fans that could be used to drive the particles. Finally, the most challenging component of the design was the coupling to the HST. If we used large inlets, the shock would lose strength as it passed by the inlet, so we designed a novel coupling inlet and outlet that minimize the losses to the shock wave. Our design was reviewed by the Extreme Fluids Team, and it is now being manufactured and built based upon our technical drawings.

Johnston, Stephen [Los Alamos National Laboratory; Garcia, Nicolas J. [Los Alamos National Laboratory; Martinez, Adam A. [Los Alamos National Laboratory; Orlicz, Gregory C. [Los Alamos National Laboratory; Prestridge, Katherine P. [Los Alamos National Laboratory

2012-08-01T23:59:59.000Z

294

Advanced Mud System for Microhole Coiled Tubing Drilling  

Science Conference Proceedings (OSTI)

An advanced mud system was designed and key components were built that augment a coiled tubing drilling (CTD) rig that is designed specifically to drill microholes (less than 4-inch diameter) with advanced drilling techniques. The mud system was tailored to the hydraulics of the hole geometries and rig characteristics required for microholes and is capable of mixing and circulating mud and removing solids while being self contained and having zero discharge capability. Key components of this system are two modified triplex mud pumps (High Pressure Slurry Pumps) for advanced Abrasive Slurry Jetting (ASJ) and a modified Gas-Liquid-Solid (GLS) Separator for well control, flow return and initial processing. The system developed also includes an additional component of an advanced version of ASJ which allows cutting through most all materials encountered in oil and gas wells including steel, cement, and all rock types. It includes new fluids and new ASJ nozzles. The jetting mechanism does not require rotation of the bottom hole assembly or drill string, which is essential for use with Coiled Tubing (CT). It also has low reactive forces acting on the CT and generates cuttings small enough to be easily cleaned from the well bore, which is important in horizontal drilling. These cutting and mud processing components and capabilities compliment the concepts put forth by DOE for microhole coiled tubing drilling (MHTCTD) and should help insure the reality of drilling small diameter holes quickly and inexpensively with a minimal environmental footprint and that is efficient, compact and portable. Other components (site liners, sump and transfer pumps, stacked shakers, filter membranes, etc.. ) of the overall mud system were identified as readily available in industry and will not be purchased until we are ready to drill a specific well.

Kenneth Oglesby

2008-12-01T23:59:59.000Z

295

DEVELOPMENT OF STRAIN IN OXIDES GROWN IN STEAM TUBES  

SciTech Connect

In this study, the foundation is being developed for the numerical simulation of the processes that determine the oxide scale exfoliation behavior of the steam-side surfaces of superheater and reheater tubes in a steam boiler. Initially, the assumptions concerning the base state for calculating oxide strains also were critically examined. The state of stress-strain of an oxide growing on the inside surface of an externally-heated tube was considered for the conditions experienced in a boiler during transition from full- to partial-load operation. Since the rate at which the oxide grows is an important consideration, it was necessary to determine the appropriate temperature to use in the oxidation rate calculations. The existence of a temperature gradient through the tube, and the cyclic nature of the boiler operation (temperature and pressure) were considered; the growth temperature of the oxide was taken to be the oxide surface temperature. It was determined that the commonly-used approach for accounting for geometrical effects when calculating stress-strain development in a growing oxide scale of using the analogy of an infinitely-long flat plate gave sufficiently different results than when using a cylindrical geometry, that the latter was adopted as the preferred calculation procedure. Preliminary calculation of strains developed in multilayered oxides formed on alloy T22 as a function of boiler operating conditions indicated the magnitude of the strains in each layer; the large strain gradients between the layers inferred the importance of the detailed scale morphology in determining the mode of exfoliation

Wright, Ian G [ORNL; Sabau, Adrian S [ORNL; Dooley, Barry [Electric Power Research Institute (EPRI)

2008-01-01T23:59:59.000Z

296

Uranium Neutron Coincidence Collar Model Utilizing Boron-10 Lined Tubes  

SciTech Connect

The Department of Energy Office of Nuclear Safeguards and Security (NA-241) is supporting the project Coincidence Counting With Boron-Based Alternative Neutron Detection Technology at Pacific Northwest National Laboratory (PNNL) for the development of a 3He proportional counter alternative neutron coincidence counter. The goal of this project is to design, build and demonstrate a system based upon 10B-lined proportional tubes in a configuration typical for 3He-based coincidence counter applications. This report, providing results for model development of Alternative Boron-Based Uranium Neutron Coincidence Collar (ABUNCL) designs, is a deliverable under Task 2 of the project.

Rogers, Jeremy L.; Ely, James H.; Kouzes, Richard T.; Lintereur, Azaree T.; Siciliano, Edward R.

2012-09-18T23:59:59.000Z

297

RESIDENTIAL AIR CONDITIONER FINNED-TUBE CONDENSER HEAT EXCHANGER OPTIMIZATION  

E-Print Network (OSTI)

With the upcoming ban on the production of R-22 in 2010, residential air-conditioning equipment will need to be redesigned with a more environmentally benign working fluid. R-410a is a strong candidate for replacing R-22. A model of an air-conditioning system with a focus on the finned-tube condenser design details using R-410a as the working fluid is developed. An optimization algorithm is implemented to find the optimal condenser design with various constraints for an efficiency figure of merit. The software developed is appropriate for engineering design use in the air-conditioning industry.

Susan W. Stewart; Kristinn A. Aspelund; Monifa F. Wright; Emma M. Sadler; Sam V. Shelton, Ph.D.

2002-01-01T23:59:59.000Z

298

Environmental Molecular Sciences Laboratory (EMSL) on YouTube  

DOE Data Explorer (OSTI)

EMSL is funded by DOE's Office of Biological & Environmental Research, which supports world-class research in the biological, chemical, and environmental sciences to provide innovative solutions to the nation's environmental challenges as well as those related to energy production. EMSL's distinctive focus on integrating computational and experimental capabilities as well as collaborating among disciplines yields a strong, synergistic scientific environment. [copied from http://www.emsl.pnl.gov/about/]. EMSL joined YouTube in 2009 and has a small collection of videos available.

299

Interactions of Hydrogen Isotopes and Oxides with Metal Tubes  

DOE Green Energy (OSTI)

Understanding and accounting for interaction of hydrogen isotopes and their oxides with metal surfaces is important for persons working with tritium systems. Reported data from several investigators have shown that the processes of oxidation, adsorption, absorption, and permeation are all coupled and interactive. A computer model has been developed for predicting the interaction of hydrogen isotopes and their corresponding oxides in a flowing carrier gas stream with the walls of a metallic tube, particularly at low hydrogen concentrations. An experiment has been constructed to validate the predictive model. Predictions from modeling lead to unexpected experiment results.

Glen R. Longhurst

2008-08-01T23:59:59.000Z

300

Retention sleeve for a thermal medium carrying tube in a gas turbine  

SciTech Connect

Multiple tubes are connected to steam supply and spent cooling steam return manifolds for supplying cooling steam to buckets and returning spent cooling steam from the buckets to the manifolds, respectively. The tubes are prevented from axial movement in one direction by flanges engaging end faces of the spacer between the first and second-stage wheels. Retention sleeves are disposed about cantilevered ends of the tubes. One end of the retention sleeve engages an enlarged flange on the tube, while an opposite end is spaced axially from an end face of the adjoining wheel, forming a gap, enabling thermal expansion of the tubes and limiting axial displacement of the tube in the opposite direction.

Lathrop, Norman Douglas (Ballston Lake, NY); Czachor, Robert Paul (Cincinnati, OH)

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Flow visualization using momentum and energy transport tubes and applications to turbulent flow in wind farms  

E-Print Network (OSTI)

As a generalization of the mass-flux based classical stream-tube, the concept of momentum and energy transport tubes is discussed as a flow visualization tool. These transport tubes have the property, respectively, that no fluxes of momentum or energy exist over their respective tube mantles. As an example application using data from large-eddy simulation, such tubes are visualized for the mean-flow structure of turbulent flow in large wind farms, in fully developed wind-turbine-array boundary layers. The three-dimensional organization of energy transport tubes changes considerably when turbine spacings are varied, enabling the visualization of the path taken by the kinetic energy flux that is ultimately available at any given turbine within the array.

Meyers, Johan

2012-01-01T23:59:59.000Z

302

Coiled tubing enables rapid CO{sub 2} completions  

Science Conference Proceedings (OSTI)

In the Bravo Dome field of northeastern New Mexico, Amoco has doubled their expected carbon dioxide (CO{sub 2}) production and reduced completion costs by 7.5% using coiled tubing in conjunction with other technologies. Amoco initially expected to produce an average 2.6 MMcfd per well. Instead, six months after completing the 31-well package, the company is producing an average 5.1 MMcfd. Important elements contributing cost and time savings on the project were: Log analysis to select perforations and help prevent water production, and lost circulation; the mobility and flexibility of coiled tubing; using cement for low-cost lost circulation control; using thermoplastic film to prevent proppant flowback; fracture designs optimized for each well; and forming an alliance between Amoco and vendors and developing of mutual trust. Amoco and other producing companies use about 95% of the CO{sub 2} produced at Amoco`s Bravo Dome field for enhanced oil recovery (EOR) projects in the Permian Basin area. Amoco sells 5% of the purest product to companies in the US food industry. While the low price of CO{sub 2}, about one-fourth that of methane, furnished part of the impetus for Amoco to implement the cost-cutting methods at Bravo Dome, the methods can be applied in many completion applications and are discussed in this paper.

Payton, R.; Baker, R.; Turner, D.; Bertrand, B.

1996-08-01T23:59:59.000Z

303

Coiled tubing drilling (CTD) moves to commercial viability  

Science Conference Proceedings (OSTI)

Shell Western E and P, Inc. (SWEPI) California Drilling Operations was interested in coiled tubing (CT) for drilling slimhole steam injectors. A four-well pilot project at South Belridge field, Kern County, Calif., was targeted for immediate CT use. Well programs included completion, a goal not previously attempted on wells drilled from surface with CT. This paper reviews the primary project focus which was to develop slimhole steam injectors and improve injection profiles in lower Tulare formation E and G sands. Feasibility of drilling wells with CT and having CT crews run and cement completion tubulars in place was an issue to be determined. Conventional tubing installation is usually outside the scope of CT operations, so it was not known if this would be technically or economically feasible. Another goal was to refine personnel expertise to further develop CTD services as a successful business line. Other items targeted for investigation were: deviation control; lost circulation solutions; WOB optimization to obtain maximum ROP; potential steam blowout intervals; and high temperature. Finally, economic feasibility of using CTD as a rotary rig alternative for specific applications like slimhole wells on sites where surface location is limited was to be determined.

Romagno, R. (Shell Western E and P, Inc., Bakersfield, CA (United States)); Walker, R. (Schlumberger Dowell, Bakersfield, CA (United States))

1994-12-01T23:59:59.000Z

304

Microhole High-Pressure Jet Drill for Coiled Tubing  

SciTech Connect

Tempress Small Mechanically-Assisted High-Pressure Waterjet Drilling Tool project centered on the development of a downhole intensifier (DHI) to boost the hydraulic pressure available from conventional coiled tubing to the level required for high-pressure jet erosion of rock. We reviewed two techniques for implementing this technology (1) pure high-pressure jet drilling and (2) mechanically-assisted jet drilling. Due to the difficulties associated with modifying a downhole motor for mechanically-assisted jet drilling, it was determined that the pure high-pressure jet drilling tool was the best candidate for development and commercialization. It was also determined that this tool needs to run on commingled nitrogen and water to provide adequate downhole differential pressure and to facilitate controlled pressure drilling and descaling applications in low pressure wells. The resulting Microhole jet drilling bottomhole assembly (BHA) drills a 3.625-inch diameter hole with 2-inch coil tubing. The BHA consists of a self-rotating multi-nozzle drilling head, a high-pressure rotary seal/bearing section, an intensifier and a gas separator. Commingled nitrogen and water are separated into two streams in the gas separator. The water stream is pressurized to 3 times the inlet pressure by the downhole intensifier and discharged through nozzles in the drilling head. The energy in the gas-rich stream is used to power the intensifier. Gas-rich exhaust from the intensifier is conducted to the nozzle head where it is used to shroud the jets, increasing their effective range. The prototype BHA was tested at operational pressures and flows in a test chamber and on the end of conventional coiled tubing in a test well. During instrumented runs at downhole conditions, the BHA developed downhole differential pressures of 74 MPa (11,000 psi, median) and 90 MPa (13,000 psi, peaks). The median output differential pressure was nearly 3 times the input differential pressure available from the coiled tubing. In a chamber test, the BHA delivered up to 50 kW (67 hhp) hydraulic power. The tool drilled uncertified class-G cement samples cast into casing at a rate of 0.04 to 0.17 m/min (8 to 33 ft/hr), within the range projected for this tool but slower than a conventional PDM. While the tool met most of the performance goals, reliability requires further improvement. It will be difficult for this tool, as currently configured, to compete with conventional positive displacement downhole motors for most coil tubing drill applications. Mechanical cutters on the rotating nozzle head would improve cutting. This tool can be easily adapted for well descaling operations. A variant of the Microhole jet drilling gas separator was further developed for use with positive displacement downhole motors (PDM) operating on commingled nitrogen and water. A fit-for-purpose motor gas separator was designed and yard tested within the Microhole program. Four commercial units of that design are currently involved in a 10-well field demonstration with Baker Oil Tools in Wyoming. Initial results indicate that the motor gas separators provide significant benefit.

Ken Theimer; Jack Kolle

2007-06-30T23:59:59.000Z

305

Steam Generator Tube Integrity Risk Assessment: Volume 2: Application to Diablo Canyon Power Plant  

Science Conference Proceedings (OSTI)

Damage to steam generator tubing can impair its ability to adequately perform the required safety functions in terms of structural stability and leakage. This report describes the Diablo Canyon Power Plant application of a method for calculating risk for severe accidents involving steam generator tube failure. The method helps utilities determine risks associated with application of alternate repair criteria and/or operation with degraded tubing.

2000-08-08T23:59:59.000Z

306

ROLLING AND WELDING TYPE 430M TUBES TO STAINLESS STEEL OVERLAID CARBON STEEL TUBE-SHEETS. SM-1 (APPR-1) RESEARCH AND DEVELOPMENT PROGRAM. Task No. X.  

SciTech Connect

In the fabrication of the steam generator on APPR-1A it was considered necessary to roll the Type 430M tubes into carbon steel tubesheets to ASTM Specification A350-Grade LF-1, modifled with 1.66% nickel; and weld the tube ends to the stainless steel overlay previously applied to the tubesheet. The rolled joint was a necessary precaution to prevent secondary water, that might contain chlorides, from contacting the stainless steel weld joining the tubes to the tubesheets. The welded joint provided the mechanical strength for attaching the tubes to the tubesheets. A laboratory program was conducted, therefore, to develop practicable procedures for welding the Type 430M tubes to the stainless steel overlay; as well as to assure that the tubes could satisfactorily be rolled to the tubesheets. Automatic and manual tungstenare welding procedures were developed that were capable of consistently providing an austenitic weld having a strength exceeding that of the heat affected zone or the unaffected tube itself. Type 430M tubes in the asreceived, and softened conditions were rolled into prototype test units under various conditions of rolling. It was concluded that the Type 450M tubes in the as-received condition could be satisfactorily rolled into the A360Grade LF-1 tubesheet and be tlght to a pressurized helium leak test. To translate the laboratory procedures into fabrication practice for the steam generator consisting of the same materials, detailed welding and rolling procedures were outlined and transmitted to the fabricator, as well as included in this report. (auth)

Bennett, R.W.; Meister, R.P.; Kerton, R.J.

1959-02-16T23:59:59.000Z

307

Sigma Phase Embrittlement of a Boiler Tube Lug - Programmaster.org  

Science Conference Proceedings (OSTI)

Presentation Title, Sigma Phase Embrittlement of a Boiler Tube Lug ... which dissolves in temperatures above 1800 F. Boilers commonly operate at 1800- 2100...

308

Application of mechanistic models for flow distribution and heat transfer in finned tube bundles.  

E-Print Network (OSTI)

?? The focus of this thesis was heat transfer and pressure drop in staggered tube bundles with solid and serrated fins. The first part of (more)

Eikill, Astrid Oygarden

2013-01-01T23:59:59.000Z

309

Tube Failure in Coal and Gas Fired Power Plant - Programmaster.org  

Science Conference Proceedings (OSTI)

On-Site Speaker (Planned), Lindsay S. W. Malloy. Abstract Scope, Tube failures in power plants are one of the main causes of forced outages, potentially costing ...

310

CONDITIONS FOR TRANSVERSE WAVES PROPAGATION ALONG THIN MAGNETIC FLUX TUBES ON THE SUN  

SciTech Connect

The propagation of kink waves in the thin gravity stratified flux tubes with a generalized magnetic field distribution model is considered in cylindrical geometry. The new kink wave equations for both wave variables are obtained. It is shown that the inclusion of the radial component of an unperturbed tube magnetic field sufficiently transforms the conditions for the propagation of transverse waves. It is demonstrated that, for the models of isothermal and polytropic atmosphere in the tube and its environment, the propagation of kink waves along thin magnetic flux tubes is cutoff-free.

Lopin, Igor [Ussuriisk Astrophysical Observatory, Russian Academy of Sciences, Ussuriisk (Russian Federation); Nagorny, Ivan, E-mail: lopin78@mail.ru [Institute of Automation and Control Processes FEB RAS, Vladivostok (Russian Federation)

2013-09-10T23:59:59.000Z

311

Development of Corrosion Resistant Coatings For The ID Surface Of HRSG Tubes  

Science Conference Proceedings (OSTI)

Flow-accelerated corrosion (FAC) causes wall thinning (metal loss) in tubes due to flow of water or two-phase wet steam. Wall thinning from FAC in proximity of heat recovery steam generator (HRSG) tube elbows has resulted in numerous tube failures. Use of a reliable and durable protective coating would minimize FAC-induced corrosion and avoid steam tube failures. Thus, there is a great need to develop advanced coating deposition methods for applying corrosion-resistant coatings on the internal surface of...

2008-03-19T23:59:59.000Z

312

Heavy-wall production tubing design for special-alloy steels  

Science Conference Proceedings (OSTI)

Critical wells require a comprehensive design philosophy for downhole tubulars. This paper describes novel design techniques used on four key tubing-design tasks on a 23,000-ft (7010-m), high-pressure, offshore gas well: material selection, tubing sizing, threaded-connector qualification, and field installation planning. The in-depth engineering approach combined stringent material and threaded-connector qualifications with new tubing-sizing methods and thorough installation planning. Standard tubing-sizing methods were unacceptable because of conservatism about erosional velocity and stress analysis inaccuracy. Proper stress analysis of the alloy required consideration of triaxial stress states, anisotropy of mechanical properties, and temperature weakening of yield stress.

Payne, M.L.; Hurst, D.M.

1986-07-01T23:59:59.000Z

313

Transmutation rates in the annulus gas of pressure tube water reactors.  

E-Print Network (OSTI)

??CANDU (CANada Deuterium Uranium) reactor utilizes Pressure Tube (PT) fuel channel design and heavy water as a coolant. Fuel channel annulus gas acts as an (more)

Ahmad, Mohammad Mateen

2011-01-01T23:59:59.000Z

314

Thermal stress analysis of eccentric tube receiver using concentrated solar radiation  

SciTech Connect

In the parabolic trough concentrator with tube receiver system, the heat transfer fluid flowing through the tube receiver can induce high thermal stress and deflection. In this study, the eccentric tube receiver is introduced with the aim to reduce the thermal stresses of tube receiver. The ray-thermal-structural sequential coupled numerical analyses are adopted to obtain the concentrated heat flux distributions, temperature distributions and thermal stress fields of both the eccentric and concentric tube receivers. During the sequential coupled numerical analyses, the concentrated heat flux distribution on the bottom half periphery of tube receiver is obtained by Monte-Carlo ray tracing method, and the fitting function method is introduced for the calculated heat flux distribution transformation from the Monte-Carlo ray tracing model to the CFD analysis model. The temperature distributions and thermal stress fields are obtained by the CFD and FEA analyses, respectively. The effects of eccentricity and oriented angle variation on the thermal stresses of eccentric tube receiver are also investigated. It is recommended to adopt the eccentric tube receiver with optimum eccentricity and 90 oriented angle as tube receiver for the parabolic trough concentrator system to reduce the thermal stresses. (author)

Wang, Fuqiang; Shuai, Yong; Yuan, Yuan; Yang, Guo; Tan, Heping [School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin 150001 (China)

2010-10-15T23:59:59.000Z

315

Air feed tube support system for a solid oxide fuel cell generator  

DOE Patents (OSTI)

A solid oxide fuel cell generator (12), containing tubular fuel cells (36) with interior air electrodes (18), where a supporting member (82) containing a plurality of holes (26) supports oxidant feed tubes (51), which pass from an oxidant plenum (52") into the center of the fuel cells, through the holes (26) in the supporting member (82), where a compliant gasket (86) around the top of the oxidant feed tubes and on top (28) of the supporting member (82) helps support the oxidant feed tubes and center them within the fuel cells, and loosen the tolerance for centering the air feed tubes.

Doshi, Vinod B. (Monroeville, PA); Ruka, Roswell J. (Pittsburgh, PA); Hager, Charles A. (Zelienople, PA)

2002-01-01T23:59:59.000Z

316

Design of shell and tube heat exchanger using specified pressure drop.  

E-Print Network (OSTI)

??The pressure drops used in heat exchange of shell and tube type, the situations are particular and put ahead of the design exercise. In such (more)

Bilimoria, Vimalkumar B.

2010-01-01T23:59:59.000Z

317

L-6: Energy Absorption of Aluminum Foam-Filled Tubes under Quasi ...  

Science Conference Proceedings (OSTI)

In addition, the energy absorption of foamtube configuration was 4.5 times of ... Steel-Aluminium Composite Castings for High-Performance Die Cooling...

318

Co-gasification of biomass with coal and oil sands coke in a drop tube furnace.  

E-Print Network (OSTI)

??Chars were obtained from individual fuels and blends with different blend ratios of coal, coke and biomass in Drop Tube Furnace at different temperatures. Based (more)

Gao, Chen

2010-01-01T23:59:59.000Z

319

Leaching Toxicity of Pb and Ba Containing in Cathode Ray Tube ...  

Science Conference Proceedings (OSTI)

Presentation Title, Leaching Toxicity of Pb and Ba Containing in Cathode Ray Tube Glasses by SEP-TCLP. Author(s), Mengjun Chen, Fu-Shen Zhang, Jianxin ...

320

A Novel Process for Lead Extraction from Scrap Cathode Ray Tube ...  

Science Conference Proceedings (OSTI)

Leaching Toxicity of Pb and Ba Containing in Cathode Ray Tube Glasses by SEP -TCLP Mechanical Recycling of Electronic Wastes for Materials Recovery.

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Monitoring field soil suction using a miniature tensiometer  

E-Print Network (OSTI)

An experimental device was developed to monitor the field soil suction using miniature tensiometer. This device consists of a double tube system that ensures a good contact between the tensiometer and the soil surface at the bottom of the testing borehole. This system also ensures the tensiometer periodical retrieving without disturbing the surrounding soil. This device was used to monitor the soil suction at the site of Boissy-le-Ch\\^atel, France. The measurement was performed at two depths (25 and 45 cm) during two months (May and June 2004). The recorded suction data are analyzed by comparing with the volumetric water content data recorded using TDR (Time Domain Reflectometer) probes as well as the meteorological data. A good agreement between these results was observed, showing a satisfactory performance of the developed device.

Cui, Yu-Jun; Mantho, Altin Theodore; De Laure, Emmanuel

2008-01-01T23:59:59.000Z

322

Temperature Evolution and Oxide Growth in Waterwall Tubes of Supercritical Units  

SciTech Connect

In order to understand the failures in some waterwall tubes of supercritical steam boilers, an analysis is required to estimate the temperature of the waterwall tubes and the oxide growth in these tubes. A review on the thermophysical properties of oxide grown in waterwall tubes was conducted. Specimens of waterwall tubes associated with thermal fatigue cracking were obtained and microstructural analyses, using metallographic and electron-optical techniques such as SEM and electron-probe microanalysis, were performed. A computer model is being developed to estimate the maximum temperature in waterwall tubes by considering several phenomena that take place in supercritical units. The comprehensive model includes the following boiler operation features and phenomena: oxide growth, distribution of the heat flux on the waterwall tube as a function of height distance, variation of steam flow rate due to load variation, variation of heat flux due to load variation, and variation of the heat transfer coefficient with steam conditions and furnace heat flux. The model will handle the transition subcritical-to-supercritical and will account for the heat transfer deterioration phenomena in tubes. The tube regions with deteriorated heat transfer regimes will be identified. The temperatures of steam, metal, and oxide will be obtained as a function of the height distance in the boiler. The mixing effects of the steam from different waterwall tubes and subsequent fluid dynamics effects on the heat transfer will be considered. The new model will enable the prediction of the maximum metal temperature for realistic boiler operation schedule, which include transitions from full-to-low loads. Based on the estimated data for the steam temperature, metal temperature, and oxide thickness, regions of the waterwall tubes that are exposed to the most severe conditions will be identified.

Sabau, Adrian S [ORNL; Wright, Ian G [ORNL; Zhang, Wei [ORNL; Pint, Bruce A [ORNL; Unocic, Kinga A [ORNL

2010-01-01T23:59:59.000Z

323

Sandjet- A New Alternative for Cleaning Furnace Tubes  

E-Print Network (OSTI)

Energy management in modern refineries is becoming more difficult as the real cost of in-house and purchased fuel escalates and the quality of feed stocks decreases. Furnace tube maintenance has been made more complex by the presence of not only coke but extensive inorganic deposits while the demands of efficient fuel utilization require superior results from decoking procedures. Union Carbide Industrial Services Co., (UCISCO), is continuing the development of its proprietary 'SANDJET' system that removes coke as well as other inorganic deposits efficiently and rapidly. The procedure features computerized job planning and control in order to assure accurate estimates of cost and the proper selection of cleaning parameters and materials. Energy saving benefits of the process have recently become obvious and case studies summarizing these results are discussed. A description of the newly developed job controls and a brief summary of recent experiences in the field will be described in this paper.

Pollock, C. B.

1981-01-01T23:59:59.000Z

324

Technical Design Report for the: PANDA Straw Tube Tracker  

E-Print Network (OSTI)

This document describes the technical layout and the expected performance of the Straw Tube Tracker (STT), the main tracking detector of the PANDA target spectrometer. The STT encloses a Micro-Vertex-Detector (MVD) for the inner tracking and is followed in beam direction by a set of GEM-stations. The tasks of the STT are the measurement of the particle momentum from the reconstructed trajectory and the measurement of the specific energy-loss for a particle identification. Dedicated simulations with full analysis studies of certain proton-antiproton reactions, identified as being benchmark tests for the whole \\Panda scientific program, have been performed to test the STT layout and performance. The results are presented, and the time lines to construct the STT are described.

Erni, W; Krusche, B; Steinacher, M; Heng, Y; Liu, Z; Liu, H; Shen, X; Wang, Q; Xu, H; Aab, A; Albrecht, M; Becker, J; Csap, A; Feldbauer, F; Fink, M; Friedel, P; Heinsius, F H; Held, T; Klask, L; Koch, H; Kopf, B; Leiber, S; Leyhe, M; Motzko, C; Pelizus, M; Pychy, J; Roth, B; Schrder, T; Schulze, J; Sowa, C; Steinke, M; Trifterer, T; Wiedner, U; Zhong, J; Beck, R; Bianco, S; Brinkmann, K T; Hammann, C; Hinterberger, F; Kaiser, D; Kliemt, R; Kube, M; Pitka, A; Quagli, T; Schmidt, C; Schmitz, R; Schnell, R; Thoma, U; Vlasov, P; Walther, D; Wendel, C; Wrschig, T; Zaunick, H G; Bianconi, A; Bragadireanu, M; Caprini, M; Pantea, D; Pantelica, D; Pietreanu, D; Serbina, L; Tarta, P D; Kaplan, D; Fiutowski, T; Idzik, M; Mindur, B; Przyborowski, D; Swientek, K; Czech, B; Kistryn, M; Kliczewski, S; Kozela, A; Kulessa, P; Lebiedowicz, P; Pysz, K; Schfer, W; Siudak, R; Szczurek\\inst, A; Jowzaee, S; Kajetanowicz, M; Kamys, B; Kistryn, S; Korcyl, G; Korcyl, K; Krzemien, W; Magiera, A; Moskal, P; Palka, M; Rudy, Z; Salabura, P; Smyrski, J; Wro?ska\\inst, A; Al-Turany, M; Arora, R; Augustin, I; Deppe, H; Flemming, H; Gerhardt, A; Gtzen, K; Jordi, A F; Kalicy, G; Karabowicz, R; Lehmann, D; Lewandowski, B; Lhning, J; Maas, F; Orth, H; Patsyuk, M; Peters, K; Saito, T; Schepers, G; Schmidt, C J; Schmitt, L; Schwarz, C; Schwiening, J; Traxler, M; Voss, B; Wieczorek, P; Wilms, A; Zhlsdorf\\inst, M; Abazov, V M; Alexeev, G; Arefiev, A; Astakhov, V I; Barabanov, M Yu; Batyunya, B V; Davydov, Yu I; Dodokhov, V Kh; Efremov, A A; Fedunov, A G; Festchenko, A A; Galoyan, A S; Grigoryan, S; Karmokov, A; Koshurnikov, E K; Lobanov, V I; Lobanov, Yu Yu; Makarov, A F; Malinina, L V; Malyshev, V L; Mustafaev, G A; Olshevskiy, A; Pasyuk, M A; Perevalova, E A; Piskun, A A; Pocheptsov, T A; Pontecorvo, G; Rodionov, V K; Rogov, Yu N; Salmin, R A; Samartsev, A G; Sapozhnikov, M G; Shabratova, G S; Skachkova, A N; Skachkov, N B; Strokovsky, E A; Suleimanov, M K; Teshev, R Sh; Tokmenin, V V; Uzhinsky, V V; Vodopyanov, A S; Zaporozhets, S A; Zhuravlev, N I; Zorin, A G; Branford, D; Glazier, D; Watts, D; Woods, P; Britting, A; Eyrich, W; Lehmann, A; Uhlig, F; Dobbs, S; Metreveli, Z; Seth, K; Tomaradze, A; Xiao, T; Bettoni, D; Carassiti, V; Ramusino, A Cotta; Dalpiaz, P; Drago, A; Fioravanti, E; Garzia, I; Savri, M; Stancari, G; Bianchi, N; Gianotti, P; Guaraldo, C; Lucherini, V; Orecchini, D; Pace, E; Bersani, A; Bracco, G; Macri, M; Parodi, R F; Bremer, D; Dormenev, V; Drexler, P; Dren, M; Eissner, T; Fhl, K; Galuska, M; Gessler, T; Hayrapetyan, A; Hu, J; Koch, P; Krck, B; Khn, W; Lange, S; Liang, Y; Merle, O; Metag, V; Moritz, M; Mnchow, D; Nanova, M; Novotny, R; Spruck, B; Stenzel, H; Ullrich, T; Werner, M; Xu, H; Euan, C; Hoek, M; Ireland, D; Keri, T; Montgomery, R; Protopopescu, D; Rosner, G; Seitz, B; Babai, M; Glazenborg-Kluttig, A; Kavatsyuk, M; Lemmens, P; Lindemulder, M; Lhner, H; Messchendorp, J; Moeini, H; Schakel, P; Schreuder, F; Smit, H; Tambave, G; Weele, J C van der; Veenstra\\inst, R; Sohlbach, H; Bscher, M; Deermann, D; Dosdall, R; Esch, S; Gillitzer, A; Goldenbaum, F; Grunwald, D; Henssler, S; Herten, A; Hu, Q; Kemmerling, G; Kleines, H; Kozlov, V; Lehrach, A; Maier, R; Mertens, M; Ohm, H; Orfanitski, S; Prasuhn, D; Randriamalala, T; Ritman, J; Schadmand, S; Serdyuk, V; Sterzenbach, G; Stockmanns, T; Wintz, P; Wstner, P; Xu, H; Kisiel, J; Li, S; Li, Z; Sun, Z; Xu, H; Rigato, V; Fissum, S; Hansen, K; Isaksson, L; Lundin, M; Schrder, B; Achenbach, P; Bleser, S; Cahit, U; Cardinali, M; Denig, A; Distler, M; Fritsch, M; Kangh, D; Karavdina, A; Lauth, W; Merkel, H; Michel, M; Espi, M C Mora; Mller, U; Pochodzalla, J; Prometeusz, J; Sanchez, S; Sanchez-Lorente, A; Schlimme, S; Sfienti, C; Weber\\inst, M Thiel T; Dormenev, V I; Fedorov, A A; Korzhik, M V; Missevitch, O V; Balanutsa, V; Chernetsky, V; Demekhin, A; Dolgolenko, A; Fedorets, P; Gerasimov, A; Goryachev, V; Varentsov, V; Boukharov, A; Malyshev, O; Marishev, I; Semenov, A; Bhmer, F; Drheim, S; Ketzer, B; Paul, S; Hergemller, A K; Khoukaz, A; Khler, E; Tschner, A; Wessels, J; Varma, R; Chaterjee, A; Jha, V; Kailas, S; Roy, B; Yan, Y; Chinorat, K; Khanchai, K; Ayut, L; Pomrad, S; Baldin, E; Kotov, K; Peleganchuk, S; Tikhonov, Yu; Boucher, J; Chambert, V; Dbeyssi, A; Hennino, T; Imre, M; Kunne, R; Galliard, C Le; Ma, B; Marchand, D; Maroni, A; Ong, S; Ramstein, B; Rosier, P; Sudol, M; Tomasi-Gustafsson, E; Wiele, J Van de; Boca, G; Braghieri, A; Costanza, S; Genova, P; Lavezzi, L; Montagna, P; Rotondi, A; Abramov, V; Belikov, N; Davidenko, A; Derevschikov, A; Goncharenko, Y; Grishin, V; Kachanov, V; Konstantinov, D; Kormilitsin, V; Melnik, Y; Levin, A; Minaev, N; Mochalov, V; Morozov, D; Nogach, L; Poslavskiy, S; Ryazantsev, A; Ryzhikov, S; Semenov, P; Shein, I; Uzunian, A; Vasiliev, A; Yakutin, A; Bck, T

2012-01-01T23:59:59.000Z

325

Field Demonstraton of Existing Microhole Coiled Tubing Rig (MCTR) Technology  

SciTech Connect

The performance of an advanced Microhole Coiled Tubing Rig (MCTR) has been measured in the field during the drilling of 25 test wells in the Niobrara formation of Western Kansas and Eastern Colorado. The coiled tubing (CT) rig designed, built and operated by Advanced Drilling Technologies (ADT), was documented in its performance by GTI staff in the course of drilling wells ranging in depth from 500 to nearly 3,000 feet. Access to well sites in the Niobrara for documenting CT rig performance was provided by Rosewood Resources of Arlington, VA. The ADT CT rig was selected for field performance evaluation because it is one of the most advanced commercial CT rig designs that demonstrate a high degree of process integration and ease of set-up and operation. Employing an information collection protocol, data was collected from the ADT CT rig during 25 drilling events that encompassed a wide range of depths and drilling conditions in the Niobrara. Information collected included time-function data, selected parametric information indicating CT rig operational conditions, staffing levels, and field observations of the CT rig in each phase of operation, from rig up to rig down. The data obtained in this field evaluation indicates that the ADT CT rig exhibited excellent performance in the drilling and completion of more than 25 wells in the Niobrara under varied drilling depths and formation conditions. In the majority of the 25 project well drilling events, ROP values ranged between 300 and 620 feet per hour. For all but the lowest 2 wells, ROP values averaged approximately 400 feet per hour, representing an excellent drilling capability. Most wells of depths between 500 and 2,000 feet were drilled at a total functional rig time of less than 16 hours; for wells as deep at 2,500 to 3,000 feet, the total rig time for the CT unit is usually well under one day. About 40-55 percent of the functional rig time is divided evenly between drilling and casing/cementing. The balance of time is divided among the remaining four functions of rig up/rig down, logging, lay down bottomhole assembly, and pick up bottomhole assembly. Observations made during all phases of CT rig operation at each of the project well installations have verified a number of characteristics of the technology that represent advantages that can produce significant savings of 25-35 percent per well. Attributes of the CT rig performance include: (1) Excellent hole quality with hole deviation amounting to 1-2 degrees; (2) Reduced need for auxiliary equipment; (3) Efficient rig mobilization requiring only four trailers; (4) Capability of ''Zero Discharge'' operation; (5) Improved safety; and, (6) Measurement while drilling capability. In addition, commercial cost data indicates that the CT rig reduces drilling costs by 25 to 35% compared to conventional drilling technology. Widespread commercial use of the Microhole Coiled Tubing technology in the United States for onshore Lower-48 drilling has the potential of achieving substantially positive impacts in terms of savings to the industry and resource expansion. Successfully commercialized Microhole CT Rig Technology is projected to achieve cumulative savings in Lower-48 onshore drilling expenditures of approximately 6.8 billion dollars by 2025. The reduced cost of CT microhole drilling is projected to enable the development of gas resources that would not have been economic with conventional methods. Because of the reduced cost of drilling achieved with CT rig technology, it is estimated that an additional 22 Tcf of gas resource will become economic to develop. In the future, the Microhole Coiled Tubing Rig represents an important platform for the continued improvement of drilling that draws on a new generation of various technologies to achieve goals of improved drilling cost and reduced impact to the environment.

Kent Perry; Samih Batarseh; Sheriff Gowelly; Thomas Hayes

2006-05-09T23:59:59.000Z

326

Glass-heat-pipe evacuated-tube solar collector  

DOE Patents (OSTI)

A glass heat pipe is adapted for use as a solar energy absorber in an evacuated tube solar collector and for transferring the absorbed solar energy to a working fluid medium or heat sink for storage or practical use. A capillary wick is formed of granular glass particles fused together by heat on the inside surface of the heat pipe with a water glass binder solution to enhance capillary drive distribution of the thermal transfer fluid in the heat pipe throughout the entire inside surface of the evaporator portion of the heat pipe. Selective coatings are used on the heat pipe surface to maximize solar absorption and minimize energy radiation, and the glass wick can alternatively be fabricated with granular particles of black glass or obsidian.

McConnell, R.D.; VanSant, J.H.

1981-08-06T23:59:59.000Z

327

NRELOpenStudio Tutorial Videos on YouTube  

DOE Data Explorer (OSTI)

OpenStudio is a cross-platform (Windows, Mac, and Linux) collection of software tools to support whole building energy modeling using EnergyPlus and advanced daylight analysis using Radiance. OpenStudio is an open source project to facilitate community development, extension, and private sector adoption. OpenStudio includes graphical interfaces along with a Software Development Kit (SDK) [copied from the NRELOpenStudio website at http://openstudio.nrel.gov]. It promotes open and rapid application development and can be tailored for specific audience and specific research results. In addition to the website, where software and documentation are available for download, be sure to visit the NRELOpenStudio channel on YouTube. More than 120 short videos provide training and insight into the use and applications for NRELOpenStudio. Note that an active forum for developers is also located on the website at http://openstudio.nrel.gov/forum.

328

An Advanced simulation Code for Modeling Inductive Output Tubes  

Science Conference Proceedings (OSTI)

During the Phase I program, CCR completed several major building blocks for a 3D large signal, inductive output tube (IOT) code using modern computer language and programming techniques. These included a 3D, Helmholtz, time-harmonic, field solver with a fully functional graphical user interface (GUI), automeshing and adaptivity. Other building blocks included the improved electrostatic Poisson solver with temporal boundary conditions to provide temporal fields for the time-stepping particle pusher as well as the self electric field caused by time-varying space charge. The magnetostatic field solver was also updated to solve for the self magnetic field caused by time changing current density in the output cavity gap. The goal function to optimize an IOT cavity was also formulated, and the optimization methodologies were investigated.

Thuc Bui; R. Lawrence Ives

2012-04-27T23:59:59.000Z

329

PERFORMANCE OF A SINGLE-ROW HEAT EXCHANGER AT LOW IN-TUBE FLOW RATES  

E-Print Network (OSTI)

PERFORMANCE OF A SINGLE-ROW HEAT EXCHANGER AT LOW IN-TUBE FLOW RATES A Thesis Submitted April 1995 #12;PERFORMANCE OF A SINGLE-ROW HEAT EXCHANGER AT LOW IN-TUBE FLOW RATES by Xiangwei Zhao Abstract The steady and time-dependentbehavior of a single-row heat exchanger with water and air in the in

Sen, Mihir

330

Effects of winglets to augment tube wall heat transfer in louvered fin heat exchangers  

E-Print Network (OSTI)

Effects of winglets to augment tube wall heat transfer in louvered fin heat exchangers Paul A Abstract The louvered fin heat exchanger, a type of compact heat exchanger, has been used heavily transfer along the tube wall of the compact heat exchanger through the use of winglets placed

Thole, Karen A.

331

OPTIMALDESIGN OF MICRO BARE-TUBE HEAT EXCHANGER Sawat Paitoonsurikarn, Nobuhide Kasagi, and Yuji Suzuki  

E-Print Network (OSTI)

OPTIMALDESIGN OF MICRO BARE-TUBE HEAT EXCHANGER Sawat Paitoonsurikarn, Nobuhide Kasagi, and Yuji-8656, Japan Email: sawat@thtlab.t.u-tokyo.ac.jp; Fax: +81-(3)-5800-6999 Keywords: Compact Heat Exchanger, Tube on the simulated annealing technique has been developed for a compact heat exchanger that employs only small

Kasagi, Nobuhide

332

Enhanced shell-and-tube heat eschangers for the power and process industries. Final report  

SciTech Connect

Single-tube pool boiling tests were performed with saturated pure refrigerants and binary mixtures of refrigerants. Generally, with pure refrigerants, the High Flux surface performed better at the higher heat fluxes compared to the Turbo-B tube, and both enhanced surfaces performed significantly better than smooth surface. In tests of R-11/R-113 mixtures, the enhanced surfaces had much less degradation in heat transfer coefficient due to mixture effects compared to smooth tubes; the largest degradation occurred at a mixture of 25% R-11/75% R-113. Under boiling in saturated aqueous solution of calcium sulfate, with a single tube, effects of fouling were more pronounced at the higher heat fluxes for all surfaces. Two staggered tube bundles were tested with tube pitch-diameter ratios of 1.17 and 1.50. For the pure refrigerant, tests on the smooth-tube bundle indicated that the effects on the heat transfer coefficient of varying mass flux, quality, and tube-bundle geometry were small, except at low heat fluxes. Neither enhanced surface showed any effect with changing mass flux or quality. The binary mixture bundle-boiling tests had results that were very similar to those obtained with the pure refrigerants. When boiling a refrigerant-oil mixture, all three surfaces (smooth, High Flux, and Turbo-B) experienced a degradation in its heat transfer coefficient; no surface studied was found to be immune or vulnerable to the presence of oil than another surface.

Bergles, A.E.; Jensen, M.K.; Somerscales, E.F.; Curcio, L.A. Jr.; Trewin, R.R.

1994-08-01T23:59:59.000Z

333

A theoretical model of film condensation in a bundle of horizontal low finned tubes  

Science Conference Proceedings (OSTI)

The previous theoretical model of film condensation on a single horizontal low finned tube is extended to include the effect of condensate inundation. Based on the flow characteristics of condensate on a vertical column of horizontal low finned tubes, two major flow modes, the column mode and the sheet mode, are considered. In the column mode, the surface of the lower tubes is divided into the portion under the condensate column where the condensate flow is affected by the impinging condensate from the upper tubes, and the portion between the condensate columns where the condensate flow is not affected by the impinging condensate. In the sheet mode, the whole tube surface is assumed to be affected by the impinging condensate. Sample calculations for practical conditions show that the effects of the fin spacing and the number of vertical tube rows on the heat transfer performance is significant for R-12, while the effects are small for steam. The predicted value of the heat transfer coefficient for each tube row compares well with available experimental data, including four fluids and five tube bundles.

Honda, H.; Nozu, S.; Takeda, Y. (Okayama Univ. (Japan))

1989-05-01T23:59:59.000Z

334

Numerical simulation of steady and unsteady mixed convection from tubes of elliptic cross-section  

Science Conference Proceedings (OSTI)

The problem of two-dimensional laminar mixed convection (forced and free convection) from a tube of elliptic cross-section has been numerically simulated for the cases when the approaching flow is either steady or fluctuating. The elliptic cross-section ... Keywords: elliptic tube, fluctuating flow, heat transfer, mixed convection

H. M. Badr; E. H. Ahmed

2002-09-01T23:59:59.000Z

335

Extensional and Flexural Waves in a Thin-Walled Graphite/Epoxy Tube  

Science Conference Proceedings (OSTI)

Simulated acoustic emission signals were induced in a thin-walled graphite/epoxy tube by means of lead breaks (Hsu-Neilsen source). The tube is of similar material and layup to be used by NASA in fabricating the struts of Space Station Freedom. The resulting ...

Prosser William H.; Gorman Michael R.; Dorighi John

1992-01-01T23:59:59.000Z

336

Operator splitting approach applied to oscillatory flow and heat transfer in a tube  

Science Conference Proceedings (OSTI)

The method of operator splitting is applied to an advection-diffusion model as it occurs in a pulse tube. Firstly, the governing equations of the simplified model are studied and the mathematical description is derived. Then the splitting approach is ... Keywords: 35L65, 65M06, 80A20, Domain decomposition, Operator splitting, Pulse tube, Recuperator, Taylor dispersion

R. Widura; M. Lehn; K. Muralidhar; R. Scherer

2008-02-01T23:59:59.000Z

337

Collector surface for a microwave tube comprising a carbon-bonded carbon-fiber composite  

DOE Patents (OSTI)

In a microwave tube, an improved collector surface coating comprises a porous carbon composite material, preferably a carbon-bonded carbon fiber composite having a bulk density less than about 2 g/cc. Installation of the coating is readily adaptable as part of the tube manufacturing process.

Lauf, Robert J. (Oak Ridge, TN); McMillan, April D. (Knoxville, TN); Johnson, Arvid C. (Lake in the Hills, IL); Moorhead, Arthur J. (Knoxville, TN)

1998-01-01T23:59:59.000Z

338

Simulations of transonic shock-tube flow with a model micro-cylinder in the driver  

Science Conference Proceedings (OSTI)

A unique hand-held needle-free powder injection system, using a transient shock-tube flow to deliver powder genes and drugs into human skin for a wide range of treatments, has been proposed. In the development of such devices, a strong non-linear phenomenon, ... Keywords: Laminar, Separation, Shock-tube, Simulation, Transition, Turbulence

Yi Liu; Mark A. F. Kendall

2007-02-01T23:59:59.000Z

339

DYNAMIC SIMULATION OF MONO-TUBE CAVITY RECEIVERS FOR DIRECT STEAM GENERATION  

E-Print Network (OSTI)

-tracing study of the heat flux distribution inside the steam receiver is used to spatially refine the modelDYNAMIC SIMULATION OF MONO-TUBE CAVITY RECEIVERS FOR DIRECT STEAM GENERATION José Zapata 1 , John dish has been in operation since 2010 with a mono-tube steam cavity receiver, the SG4 system

340

Effectiveness of Inhibitors on IGA/SCC of Alloy 600 Tubing  

Science Conference Proceedings (OSTI)

Intergranular attack (IGA) and intergranular stress corrosion cracking (IGSCC) on the secondary side of alloy 600 steam generator tubes are the most common forms of corrosion in recirculating pressurized water reactor (PWR) steam generators. This report describes research to identify additives to steam generators that could inhibit IGSCC in alloy 600 steam generator tubes.

1998-10-23T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Numerical study on coupled fluid flow and heat transfer process in parabolic trough solar collector tube  

SciTech Connect

A unified two-dimensional numerical model was developed for the coupled heat transfer process in parabolic solar collector tube, which includes nature convection, forced convection, heat conduction and fluid-solid conjugate problem. The effects of Rayleigh number (Ra), tube diameter ratio and thermal conductivity of the tube wall on the heat transfer and fluid flow performance were numerically analyzed. The distributions of flow field, temperature field, local Nu and local temperature gradient were examined. The results show that when Ra is larger than 10{sup 5}, the effects of nature convection must be taken into account. With the increase of tube diameter ratio, the Nusselt number in inner tube (Nu{sub 1}) increases and the Nusselt number in annuli space (Nu{sub 2}) decreases. With the increase of tube wall thermal conductivity, Nu{sub 1} decreases and Nu{sub 2} increases. When thermal conductivity is larger than 200 W/(m K), it would have little effects on Nu and average temperatures. Due to the effect of the nature convection, along the circumferential direction (from top to down), the temperature in the cross-section decreases and the temperature gradient on inner tube surface increases at first. Then, the temperature and temperature gradients would present a converse variation at {theta} near {pi}. The local Nu on inner tube outer surface increases along circumferential direction until it reaches a maximum value then it decreases again. (author)

Tao, Y.B.; He, Y.L. [State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China)

2010-10-15T23:59:59.000Z

342

The Motion and Removal Efficiency of Particles in Circular Tube Settlers  

Science Conference Proceedings (OSTI)

Based on the assumption that flow pattern in tube settlers is laminar and the distribution of flow velocity is a circumgyratetional paraboloid, general hydraulic equations are deduced, with consideration of the effectors of acceleration and initial fall ... Keywords: Motion, Circular tube settlers, Hydraulic calculation, Removal efficiency

Min Xie; Zhou Shi; Xiaobo Liu

2009-10-01T23:59:59.000Z

343

Recent experience in the fabrication and brazing of ceramic beam tubes for kicker magnets at FNAL  

SciTech Connect

Ceramic beam tubes are utilized in numerous kicker magnets in different accelerator rings at Fermi National Accelerator Laboratory. Kovar flanges are brazed onto each beam tube end, since kovar and high alumina ceramic have similar expansion curves. The tube, kovar flange, end piece, and braze foil (titanium/incusil) alloy brazing material are stacked in the furnace and then brazed in the furnace at 1000 C. The ceramic specified is 99.8% Alumina, Al{sub 2}O{sub 3}, a strong recrystallized high-alumina fabricated by slip casting. Recent experience at Fermilab with the fabrication and brazing of these tubes has brought to light numerous problems including tube breakage and cracking and also the difficulty of brazing the tube to produce a leak-tight joint. These problems may be due to the ceramic quality, voids in the ceramic, thinness of the wall, and micro-cracks in the ends which make it difficult to braze because it cannot fill tiny surface cracks which are caused by grain pullout during the cutting process. Solutions which are being investigated include lapping the ends of the tubes before brazing to eliminate the micro-cracks and also metallization of the tubes.

Ader, C.R.; Jensen, C.; Reilly, R.; Snee, D.; Wilson, J.H.; /Fermilab

2008-06-01T23:59:59.000Z

344

Steam Generator Management Program: Production of Steam Generator Tubing Flaws by Laboratory Autoclave Exposures  

Science Conference Proceedings (OSTI)

Qualification of a technique for the examination of steam generator tubing requires realistic flaws that are either pulled from service or produced in the laboratory. Due to the scarcity of pulled tube specimens, an effort was undertaken to produce realistic flaws in a laboratory environment. The ability to produce cracks in the laboratory was explored in doped steam, acidic, and caustic environments. These ...

2013-09-24T23:59:59.000Z

345

Boiler and Heat Recovery Steam Generator Tube Failures: Theory and Practice  

Science Conference Proceedings (OSTI)

Boiler and heat recovery steam generator (HRSG) tube failures have been the primary availability problem for operators of conventional and combined cycle plants for as long as reliable statistics have been kept for each generating source. This book provides owners and operators with the technical basis to address tube failures and create permanent solutions.

2011-12-23T23:59:59.000Z

346

Modeling of wire-on-tube heat exchangers using finite element method  

Science Conference Proceedings (OSTI)

Wire-on-tube heat exchangers are analysed under normal operating conditions (free convection) using finite element method. Galerkin's weighted residual method is used to minimise the errors. The effects of ambient temperatures and mass flow rates of ... Keywords: finite element method, free convection, phase change, wire on-tube heat exchangers

G. A. Quadir; G. M. Krishnan; K. N. Seetharamu

2002-03-01T23:59:59.000Z

347

Numerical simulation of the shock wave / boundary layer interaction in a shock tube by  

E-Print Network (OSTI)

Numerical simulation of the shock wave / boundary layer interaction in a shock tube by using a high in a shock tube after the shock wave has reflected at the end wall. When the fluid is viscous, a complex unsteady interaction takes place between the reflected shock wave and the incident boundary layer

348

Collector surface for a microwave tube comprising a carbon-bonded carbon-fiber composite  

DOE Patents (OSTI)

In a microwave tube, an improved collector surface coating comprises a porous carbon composite material, preferably a carbon-bonded carbon fiber composite having a bulk density less than about 2 g/cc. Installation of the coating is readily adaptable as part of the tube manufacturing process. 4 figs.

Lauf, R.J.; McMillan, A.D.; Johnson, A.C.; Moorhead, A.J.

1998-07-28T23:59:59.000Z

349

Pointwise tube formulas for fractal sprays and self-similar tilings with arbitrary generators  

E-Print Network (OSTI)

In a previous paper by the first two authors, a tube formula for fractal sprays was obtained which allows one to compute the tube formula for a certain class of self-similar fractals. The proof of this formula uses distributional techniques and requires fairly strong conditions on the geometry of the tiling (specifically, the inner tube formula for each generator of the fractal spray is required to be polynomial). Now we extend and strengthen the tube formula by removing the conditions on the geometry of the generators, and also by giving a proof of the tube formula for fractal sprays which holds pointwise, rather than distributionally. Hence, our tube formula for fractal sprays extends to higher dimensions the pointwise tube formula for (1-dimensional) fractal strings obtained earlier by Lapidus and van Frankenhuijsen. Our pointwise tube formulas are expressed as a sum of the residues of the ``tubular zeta function'' of the fractal spray in $\\mathbb{R}$. This sum ranges over the complex dimensions of the spr...

Lapidus, Michel L

2010-01-01T23:59:59.000Z

350

Design and analysis of a 5-MW vertical-fluted-tube condenser for geothermal applications  

DOE Green Energy (OSTI)

The design and analysis of an industtial-sized vertical-fluted-tube condenser. The condenser is used to condense superheated isobutane vapor discharged from a power turbine in a geothermal test facility operated for the US Department of Energy. The 5-MW condenser has 1150 coolant tubes in a four-pass configuration with a total heat transfer area of 725 m/sup 2/ (7800 ft/sup 2/). The unit is being tested at the Geothermal Components Test Facility in the Imperial Valley of East Mesa, California. The condenser design is based on previous experimental research work done at the Oak Ridge National Laboratory on condensing refrigerants on a wide variety of single vertical tubes. Condensing film coefficients obtained on the high-performance vertical fluted tubes in condensing refrigerants are as much as seven times greater than those obtained with vertical smooth tubes that have the same diameter and length. The overall heat transfer performance expected from the fluted tube condenser is four to five times the heat transfer obtained from the identical units employing smooth tubes. Fluted tube condensers also have other direct applications in the Ocean Thermal Energy Conversion (OTEC) program in condensing ammonia, in the petroleum industry in condensing light hydrocarbons, and in the air conditioning and refrigeration industry in condensing fluorocarbon vapors.

Llewellyn, G.H.

1982-03-01T23:59:59.000Z

351

MELCOR Analysis of Steam Generator Tube Creep Rupture in Station Blackout Severe Accident  

SciTech Connect

A pressurized water reactor steam generator tube rupture (SGTR) is of concern because it represents a bypass of the containment for radioactive materials to the environment. In a station blackout accident, tube integrity could be threatened by creep rupture, particularly if cracks are present in the tube walls. Methods are developed herein to improve assessment capabilities for SGTR by using the severe-accident code MELCOR. Best-estimate assumptions based on recent research and computational fluid dynamics calculations are applied in the MELCOR analysis to simulate two-dimensional natural circulation and to determine the relative creep-rupture timing in the reactor coolant pressure boundary components. A new method is developed to estimate the steam generator (SG) hottest tube wall temperature and the tube critical crack size for the SG tubes to fail first. The critical crack size for SG tubes to fail first is estimated to be 20% of the wall thickness larger than by a previous analysis. Sensitivity studies show that the failure sequence would change if some assumptions are modified. In particular, the uncertainty in the countercurrent flow limit model could reverse the failure sequence of the SG tubes and surge line.

Liao, Y.; Vierow, K. [Purdue University (United States)

2005-12-15T23:59:59.000Z

352

Effect of two-phase natural circulation distortion on tube failure in steam boilers  

SciTech Connect

Two different cases of evaporator tube ruptures in power station boilers due to natural circulation distortion are presented. The first case discussed concerns a 110-MW/sub e/ unit boiler with bottom evaporation tubing inclined at 15/sup 0/ to the horizontal. At the high heat fluxes present in the furnace, subcooled boiling occurs in inclined tubes. For these inclinations an insufficient flow rate causes local heat transfer deficiencies due to vapor-water separation. The introduction of internally finned tubes eliminates local heat transfer deficiencies and prevents further tube failures. The second case is that of circulation interruption due to blowdown during start-up. The water level in the drum of this second 110-MW/sub e/ unit boiler was controlled by inlet header blowdown during start-up. Thus, natural circulation was interrupted, causing local overheating of evaporator tubing. The event was identified by an increase of the tube rupture frequency. After changing the blowdown procedure, the interruptions of natural circulation were avoided and the tube failure frequency decreased substantially.

Afgan, N.; Radovanovic, P.; Brajuskovic, B.

1987-01-01T23:59:59.000Z

353

Investigation of Interior Airflow Visualization of U-type Fin-and-Tube Heat Exchanger  

Science Conference Proceedings (OSTI)

The interior airflow visualization of a U-type fin-and-tube heat exchanger was investigated numerically and experimentally. Numerical results presented detail information of whole airflow field. Smoke test using dry ice showed visualization of airflow, ... Keywords: Fin-and-tube heat exchanger, interior airflow, CFD, visualization, smoke test

Shihua Lu; Weihua Liu; Hu Huang; Qihe Li

2010-06-01T23:59:59.000Z

354

An Evaluation of Time Dependent Leak Rates in Degraded Steam Generator Tubing  

Science Conference Proceedings (OSTI)

Argonne National Laboratory (ANL) has performed leak rate testing of degraded steam generator tubing for a number of years as part of the Steam Generator Tube Integrity Program, under the sponsorship of the Office of Nuclear Regulatory Research of the U.S. Nuclear Regulatory Commission. This document describes the results of a review and evaluation of ANL time-dependent leak rate information.

2007-12-13T23:59:59.000Z

355

Characterization of flaws in a tube bundle mock-up for reliability studies  

Science Conference Proceedings (OSTI)

As part of an assessment of in-service inspection of steam generator tubes, the authors will assemble a steam generator mock-up for round robin studies and use as a test bed in evaluating emerging technologies. Progress is reported on the characterization of flaws that will be part of the mock-up. Eddy current and ultrasonic techniques are being evaluated as a means to characterize the flaws in the mock-up tubes before final assembly. Twenty Inconel 600 tubes with laboratory-grown cracks, typical of those to be used in the mock-up, were provided by Pacific Northwest National Laboratory for laboratory testing. After the tubes were inspected with eddy current and ultrasonic techniques, they were destructively analyzed to establish the actual depths, lengths, and profiles of the cracks. The analysis of the results will allow the best techniques to be used for characterizing the flaws in the mock-up tubes.

Kupperman, D.S.; Bakhtiari, S.

1996-10-01T23:59:59.000Z

356

Length and Straightness of the Tubes for the BOS Prototype Chamber  

E-Print Network (OSTI)

We have measured length and straightness of 50 tubes of 3.8~m length, after cleaning, wiring and testing from a batch that was used in the construction of the BOS prototype chamber. The specifi ed length (aluminum tube only, without endplug) was 3800~mm with a tolerance of $\\pm$1~mm. We found a mean value of (3805$\\pm$2)~mm with a standard deviation of (0.3$\\pm$0.1)~mm. The measureme nts of the straightness of the 50 BOS MDT tubes gave a mean of the maximum deviation of 150~$\\mu$m for 10 measured points along the tubes at 0$^{\\circ}$, 90$^{\\circ}$, 180$^{\\circ}$ and 270$^{\\circ }$ around the tube diameter and a mean value of all deviations of 20~$\\mu$m with a measuring accuracy of 10~$\\mu$m.

Lagouri, T

1998-01-01T23:59:59.000Z

357

Steam generator tube integrity program: Annual report, August 1995--September 1996. Volume 2  

Science Conference Proceedings (OSTI)

This report summarizes work performed by Argonne National Laboratory on the Steam Generator Tube Integrity Program from the inception of the program in August 1995 through September 1996. The program is divided into five tasks: (1) assessment of inspection reliability, (2) research on ISI (inservice-inspection) technology, (3) research on degradation modes and integrity, (4) tube removals from steam generators, and (5) program management. Under Task 1, progress is reported on the preparation of facilities and evaluation of nondestructive evaluation techniques for inspecting a mock-up steam generator for round-robin testing, the development of better ways to correlate failure pressure and leak rate with eddy current (EC) signals, the inspection of sleeved tubes, workshop and training activities, and the evaluation of emerging NDE technology. Results are reported in Task 2 on closed-form solutions and finite-element electromagnetic modeling of EC probe responses for various probe designs and flaw characteristics. In Task 3, facilities are being designed and built for the production of cracked tubes under aggressive and near-prototypical conditions and for the testing of flawed and unflawed tubes under normal operating, accident, and severe-accident conditions. Crack behavior and stability are also being modeled to provide guidance for test facility design, develop an improved understanding of the expected rupture behavior of tubes with circumferential cracks, and predict the behavior of flawed and unflawed tubes under severe accident conditions. Task 4 is concerned with the acquisition of tubes and tube sections from retired steam generators for use in the other research tasks. Progress on the acquisition of tubes from the Salem and McGuire 1 nuclear plants is reported.

Diercks, D.R.; Bakhtiari, S.; Kasza, K.E.; Kupperman, D.S.; Majumdar, S.; Park, J.Y.; Shack, W.J. [Argonne National Lab., IL (United States)

1998-02-01T23:59:59.000Z

358

Testing of a 7-tube palladium membrane reactor for potential use in TEP  

SciTech Connect

A Palladium Membrane Reactor (PMR) consists of a palladium/silver membrane permeator filled with catalyst (catalyst may be inside or outside the membrane tubes). The PMR is designed to recover tritium from the methane, water, and other impurities present in fusion reactor effluent. A key feature of a PMR is that the total hydrogen isotope content of a stream is significantly reduced as (1) methane-steam reforming and/or water-gas shift reactions proceed on the catalyst bed and (2) hydrogen isotopes are removed via permeation through the membrane. With a PMR design matched to processing requirements, nearly complete hydrogen isotope removals can be achieved. A 3-tube PMR study was recently completed. From the results presented in this study, it was possible to conclude that a PMR is appropriate for TEP, perforated metal tube protectors function well, platinum on aluminum (PtA) catalyst performs the best, conditioning with air is probably required to properly condition the Pd/Ag tubes, and that CO/CO{sub 2} ratios maybe an indicator of coking. The 3-tube PMR had a permeator membrane area of 0.0247 m{sup 2} and a catalyst volume to membrane area ratio of 4.63 cc/cm{sup 2} (with the catalyst on the outside of the membrane tubes and the catalyst only covering the membrane tube length). A PMR for TEP will require a larger membrane area (perhaps 0.35 m{sup 2}). With this in mind, an intermediate sized PMR was constructed. This PMR has 7 permeator tubes and a total membrane area of 0.0851 m{sup 2}. The catalyst volume to membrane area ratio for the 7-tube PMR was 5.18 cc/cm{sup 2}. The total membrane area of the 7-tube PMR (0.0851 m{sup 2}) is 3.45 times larger than total membrane area of the 3-tube PMR (0.0247 m{sup 2}). The following objectives were identified for the 7-tube PMR tests: (1) Refine test measurements, especially humidity and flow; (2) Refine maintenance procedures for Pd/Ag tube conditioning; (3) Evaluate baseline PMR operating conditions; (4) Determine PMR scaling method; (5) Evaluate PMR with realistic feed compositions; (6) Evaluate PMR performance with varying permeate pressures; (7) Study coking-related issues; and (8) Identify any unexpected behavior that may require further investigation (used to study transient behavior). This report presents the tests results defined by these objectives.

Carlson, Bryan J [Los Alamos National Laboratory; Trujillo, Stephen [Los Alamos National Laboratory; Willms, R. Scott [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

359

Development and control of the process for the manufacture of zircaloy-4 tubing for LWBR fuel rods  

Science Conference Proceedings (OSTI)

The technical requirements for the Light Water Breeder Reactor (LWBR) fuel elements (fuel rods) imposed certain unique requirements for the low hafnium Zircaloy-4 tubing used as fuel rod cladding. This report describes, in detail, the tube manufacturing process, the product and process controls used, the inspections and tests performed, and the efforts involved in refining a commercial tube reducing process to produce tubes that would satisfy the requirements for LWBR fuel rod cladding.

Eyler, J.H.

1981-01-01T23:59:59.000Z

360

The Compact Muon Solenoid (CMS) Experiment on YouTube  

DOE Data Explorer (OSTI)

The Compact Muon Solenoid (CMS) experiment is one of two large general-purpose particle physics detectors built on the proton-proton Large Hadron Collider (LHC) at CERN in Switzerland and France. The CMS detector is located in an underground cavern at Cessy in France and studies many aspects of proton collisions at 14 TeV, the center-of-mass energy of the LHC particle accelerator. [http://en.wikipedia.org/wiki/Compact_Muon_Solenoid]. US groups have made significant contributions to nearly every aspect of the detector throughout all phases including construction, installation and now in the data-taking stage. The US collaboration also made major contributions to the construction and operation of the computing facilities needed to analyze the unprecedented amount of data to be generated by CMS. This work includes the software that allows physicists to operate the CMS detector, reconstruct the data, analyze it and extract new physics. The CMS channel on YouTube was established in 2009.

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
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361

LANSCE Drift Tube Linac Water Control System Refurbishment  

Science Conference Proceedings (OSTI)

There are several refurbishment projects underway at the Los Alamos National Laboratory LANSCE linear accelerator. Systems involved are: RF, water cooling, networks, diagnostics, timing, controls, etc. The Drift Tube Linac (DTL) portion of the accelerator consists of four DTL tanks, each with three independent water control systems. The systems are about 40 years old, use outdated and non-replaceable equipment and NIM bin control modules, are beyond their design life and provide unstable temperature control. Insufficient instrumentation and documentation further complicate efforts at maintaining system performance. Detailed design of the replacement cooling systems is currently in progress. Previous design experience on the SNS accelerator water cooling systems will be leveraged, see the SNS DTL FDR. Plans call for replacement of water piping, manifolds, pumps, valves, mix tanks, instrumentation (flow, pressure and temperature) and control system hardware and software. This presentation will focus on the control system design with specific attention on planned use of the National Instruments Compact RIO platform with the Experimental Physics and Industrial Control system (EPICS) software toolkit.

Marroquin, Pilar S. [Los Alamos National Laboratory

2011-01-01T23:59:59.000Z

362

Heat transfer enhancement in a tube with equilateral triangle cross sectioned coiled wire inserts  

SciTech Connect

The heat transfer and pressure drop were experimentally investigated in a coiled wire inserted tube in turbulent flow regime. The coiled wire has equilateral triangular cross section and was inserted separately from the tube wall. The experiments were carried out with three different pitch ratios (P/D = 1, 2 and 3) and two different ratio of equilateral triangle length side to tube diameter (a/D = 0.0714 and 0.0892) at a distance (s) of 1 mm from the tube wall in the range of Reynolds number from 3500 to 27,000. Uniform heat flux was applied to the external surface of the tube and air was selected as fluid. The experimental results obtained from a smooth tube were compared with those from the studies in literature for validation of experimental set-up. The use of coiled wire inserts leads to a considerable increase in heat transfer and pressure drop over the smooth tube. The Nusselt number rises with the increase of Reynolds number and wire thickness and the decrease of pitch ratio. The highest overall enhancement efficiency of 36.5% is achieved for the wire with a/D = 0.0892 and P/D = 1 at Reynolds number of 3858. Consequently, the experimental results reveal that the best operating regime of all coiled wire inserts is detected at low Reynolds number, leading to more compact heat exchanger. (author)

Gunes, Sibel; Ozceyhan, Veysel [Department of Mechanical Engineering, Faculty of Engineering, Erciyes University, Kayseri 38039 (Turkey); Buyukalaca, Orhan [Department of Energy Systems Engineering, Faculty of Engineering, Osmaniye Korkut Ata University, Osmaniye 80000 (Turkey)

2010-09-15T23:59:59.000Z

363

Thermal-hydraulic response and iodine transport during a steam generator tube rupture  

SciTech Connect

Recent reanalyses of the offsite dose consequences following a steam generator tube rupture have identified a possible non-conservatism in original FSAR analyses. Post-trip uncovery of the top of the steam generator U-tubes, in conjunction with a break near the U-tube top, could lead to increased iodine release due to a reduced ''scrubbing'' of the iodine in the primary break fluid by the steam generator secondary liquid. To evaluate this issue, analyses were performed at the Idaho National Engineering Laboratory. The RELAP5 computer code was used to conduct an analysis of the Surry plant to determine whether the post-trip steam generator secondary mixture level was sufficient to maintain continuous coverage of the U-tubes. The results indicated continuous coverage of the U-tubes. The RELAP5 result was supported by a hand calculation. Additional RELAP5 analyses were conducted to determine magnitudes of iodine release for a steam generator tube rupture. Two sensitivity studies were conducted. The amount of iodine released to the atmosphere was strongly dependent on the assumed value of the partition coefficient. The assumption of steam generator U-tube uncovery, on a collapsed liquid level basis, following reactor trip had a minor effect on the amount of released iodine. 17 refs., 28 figs., 5 tabs.

Callow, R.A.

1988-10-01T23:59:59.000Z

364

A Built for Purpose Micro-Hole Coiled Tubing Rig (MCTR)  

Science Conference Proceedings (OSTI)

This report will serve as the final report on the work performed from the contract period October 2005 thru April 2007. The project 'A Built for Purpose Microhole Coiled Tubing Rig (MCTR)' purpose was to upgrade an existing state-of-the-art Coiled Tubing Drilling Rig to a Microhole Coiled Tubing Rig (MCTR) capable of meeting the specifications and tasks of the Department of Energy. The individual tasks outlined to meet the Department of Energy's specifications are: (1) Concept and development of lubricator and tool deployment system; (2) Concept and development of process control and data acquisition; (3) Concept and development of safety and efficiency improvements; and (4) Final unit integration and testing. The end result of the MCTR upgrade has produced a unit capable of meeting the following requirements: (1) Capable of handling 1-inch through 2-3/8-inch coiled tubing (Currently dressed for 2-3/8-inch coiled tubing and capable of running up to 3-1/2-inch coiled tubing); (2) Capable of drilling and casing surface, intermediate, production and liner hole intervals; (3) Capable of drilling with coiled tubing and has all controls and installation piping for a top drive; (4) Rig is capable of running 7-5/8-inch range 2 casing; and (5) Capable of drilling 5,000 ft true vertical depth (TVD) and 6,000 ft true measured depth (TMD).

Bart Patton

2007-09-30T23:59:59.000Z

365

New correlation to predict the heat transfer coefficient in-tube cooling of supercritical CO{sub 2} in horizontal macro-tubes  

Science Conference Proceedings (OSTI)

The heat transfer coefficient during gas cooling process of supercritical CO{sub 2} without lubricating oil in horizontal macro-tubes has experimentally investigated. Investigation has done on two stainless steel circular tubes having inside-diameter of 4.55 mm and 7.75 mm and carried out for CO{sub 2} mass fluxes of 200-600 kg/m{sup 2} s, inlet fluid pressures of 7.5-10.0 MPa, and the inlet fluid temperatures of 90-100 C. The experimental results indicate that the gas cooling pressure, the inner tube diameter, the mass flux and the temperature of CO{sub 2} have significant effects on the heat transfer coefficient, especially near pseudo-critical region. The heat transfer coefficient decreases as the cooling pressure increases otherwise increases as mass flux increases. At any temperatures, smaller inner tube diameter shows higher heat transfer coefficient. In comparison between present experimental data and existing correlations from references, most of supercritical heat transfer correlations show large deviations with this present experimental data. Therefore, based on experimental data obtained in this present work, a new correlation is proposed to predict more accurate heat transfer coefficient of supercritical CO{sub 2} in horizontal macro-tubes under cooling conditions. The majority of the experimental values are within 13% of the values predicted by the new correlation. (author)

Oh, Hoo-Kyu; Son, Chang-Hyo [Department of Refrigeration and Air-Conditioning Engineering, College of Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Pusan 608-739 (Korea)

2010-11-15T23:59:59.000Z

366

Composite tube cracking in kraft recovery boilers: A state-of-the-art review  

Science Conference Proceedings (OSTI)

Beginning in the mid-1960s, increasing energy costs in Finland and Sweden made energy recovery more critical to the cost-effective operation of a kraft pulp mill. Boiler designers responded to this need by raising the steam operating pressure, but almost immediately the wall tubes in these new boilers began to corrode rapidly. Test panels installed in the walls of the most severely corroding boiler identified austenitic stainless steel as sufficiently resistant to the new corrosive conditions, and discussions with Sandvik AB, a Swedish tube manufacturer, led to the suggestion that coextruded tubes be used for water wall service in kraft recovery boilers. Replacement of carbon steel by coextruded tubes has solved most of the corrosion problems experienced by carbon steel wall tubes, however, these tubes have not been problem-free. Beginning in early 1995, a multidisciplinary research program funded by the US Department of Energy was established to investigate the cause of cracking in coextruded tubes and to develop improved materials for use in water walls and floors of kraft recovery boilers. One portion of that program, a state-of-the-art review of public- and private-domain documents related to coextruded tube cracking in kraft recovery boilers is reported here. Sources of information that were consulted for this review include the following: tube manufacturers, boiler manufacturers, public-domain literature, companies operating kraft recovery boilers, consultants and failure analysis laboratories, and failure analyses conducted specifically for this project. Much of the information contained in this report involves cracking problems experienced in recovery boiler floors and those aspects of spout and air-port-opening cracking not readily attributable to thermal fatigue. 61 refs.

Singbeil, D.L.; Prescott, R. [Pulp and Paper Research Inst. of Canada, Vancouver, British Columbia (Canada); Keiser, J.R.; Swindeman, R.W. [Oak Ridge National Lab., TN (United States)

1997-07-01T23:59:59.000Z

367

The Effect of Tube Bend Geometry on the Development of Corrosion Fatigue Damage  

Science Conference Proceedings (OSTI)

Corrosion fatigue cracking in supply and riser tubing has occurred in a range of fossil plants. Tubing of this type can run outside the boiler so that, in some cases, the failures result in significant damage and risk for the safety of personnel. The overall EPRI effort in examining corrosion fatigue damage in supply and riser tube systems is aimed at the following: Developing a set of case studies in which the background is collated on plants exhibiting problems as well as plants where no significant da...

2011-06-30T23:59:59.000Z

368

Void fraction prediction in two-phase flow across a tube bundle  

Science Conference Proceedings (OSTI)

The hydrodynamics of two-phase flow has been investigated extensively for in-tube flows and for parallel flows in tube bundles. Very limited work has been performed, however, on vertical two-phase flows across tube bundles, which occur frequently on the shell side of heat exchangers such as kettle reboilers used in the process and other industries. In recent years, a few articles have been published on the measurement and prediction of void fraction in adiabatic, vertical air-water flow across horizontal rod bundles.

Dowlati, R.; Kawaji, M.; Chisholm, D.; Chan, A.M.C. (Dept. of Chemical Engineering and Applied Chemistry, Univ. of Toronto, Toronto, Ontario, M5S 1A4 (CA))

1992-04-01T23:59:59.000Z

369

VFLOW2D - A Vorte-Based Code for Computing Flow Over Elastically Supported Tubes and Tube Arrays  

SciTech Connect

A numerical flow model is developed to simulate two-dimensional fluid flow past immersed, elastically supported tube arrays. This work is motivated by the objective of predicting forces and motion associated with both deep-water drilling and production risers in the oil industry. This work has other engineering applications including simulation of flow past tubular heat exchangers or submarine-towed sensor arrays and the flow about parachute ribbons. In the present work, a vortex method is used for solving the unsteady flow field. This method demonstrates inherent advantages over more conventional grid-based computational fluid dynamics. The vortex method is non-iterative, does not require artificial viscosity for stability, displays minimal numerical diffusion, can easily treat moving boundaries, and allows a greatly reduced computational domain since vorticity occupies only a small fraction of the fluid volume. A gridless approach is used in the flow sufficiently distant from surfaces. A Lagrangian remap scheme is used near surfaces to calculate diffusion and convection of vorticity. A fast multipole technique is utilized for efficient calculation of velocity from the vorticity field. The ability of the method to correctly predict lift and drag forces on simple stationary geometries over a broad range of Reynolds numbers is presented.

WOLFE,WALTER P.; STRICKLAND,JAMES H.; HOMICZ,GREGORY F.; GOSSLER,ALBERT A.

2000-10-11T23:59:59.000Z

370

Radiation dose reduction to the breast in thoracic CT: Comparison of bismuth shielding, organ-based tube current modulation, and use of a globally decreased tube current  

SciTech Connect

Purpose: The purpose of this work was to evaluate dose performance and image quality in thoracic CT using three techniques to reduce dose to the breast: bismuth shielding, organ-based tube current modulation (TCM) and global tube current reduction. Methods: Semi-anthropomorphic thorax phantoms of four different sizes (15, 30, 35, and 40 cm lateral width) were used for dose measurement and image quality assessment. Four scans were performed on each phantom using 100 or 120 kV with a clinical CT scanner: (1) reference scan; (2) scan with bismuth breast shield of an appropriate thickness; (3) scan with organ-based TCM; and (4) scan with a global reduction in tube current chosen to match the dose reduction from bismuth shielding. Dose to the breast was measured with an ion chamber on the surface of the phantom. Image quality was evaluated by measuring the mean and standard deviation of CT numbers within the lung and heart regions. Results: Compared to the reference scan, dose to the breast region was decreased by about 21% for the 15-cm phantom with a pediatric (2-ply) shield and by about 37% for the 30, 35, and 40-cm phantoms with adult (4-ply) shields. Organ-based TCM decreased the dose by 12% for the 15-cm phantom, and 34-39% for the 30, 35, and 40-cm phantoms. Global lowering of the tube current reduced breast dose by 23% for the 15-cm phantom and 39% for the 30, 35, and 40-cm phantoms. In phantoms of all four sizes, image noise was increased in both the lung and heart regions with bismuth shielding. No significant increase in noise was observed with organ-based TCM. Decreasing tube current globally led to similar noise increases as bismuth shielding. Streak and beam hardening artifacts, and a resulting artifactual increase in CT numbers, were observed for scans with bismuth shields, but not for organ-based TCM or global tube current reduction. Conclusions: Organ-based TCM produces dose reduction to the breast similar to that achieved with bismuth shielding for both pediatric and adult phantoms. However, organ-based TCM does not affect image noise or CT number accuracy, both of which are adversely affected by bismuth shielding. Alternatively, globally decreasing the tube current can produce the same dose reduction to the breast as bismuth shielding, with a similar noise increase, yet without the streak artifacts and CT number errors caused by the bismuth shields. Moreover, globally decreasing the tube current reduces the dose to all tissues scanned, not simply to the breast.

Wang Jia; Duan Xinhui; Christner, Jodie A.; Leng Shuai; Yu Lifeng; McCollough, Cynthia H. [Department of Radiology, Mayo Clinic, Rochester, Minnesota 55905 (United States)

2011-11-15T23:59:59.000Z

371

A Passive Film Formed on Alloy 600 as a Steam Generator Tubing ...  

Science Conference Proceedings (OSTI)

Sep 16, 2007 ... A Passive Film Formed on Alloy 600 as a Steam Generator Tubing Material by Dong-Jin Kim, Hyuk Chul Kwon, Seong Sik Hwang and Hong...

372

The impact of improved materials in poly(vinyl chloride)-based endotracheal tubes  

E-Print Network (OSTI)

Endotracheal tubes (ETs) are used to aid artificial ventilation in millions of medical patients every year and are known to invoke the proliferative phase in the cell linings. The technical objective of this work was to ...

Domike, Kristin Rebecca, 1981-

2004-01-01T23:59:59.000Z

373

New empirical correlations for sizing adiabatic capillary tubes in refrigeration systems  

Science Conference Proceedings (OSTI)

This paper presents new empirical correlations that have been developed for sizing adiabatic capillary tubes used in small vapor compression refrigeration and air-conditioning systems. A numerical model which is based on the basic equations of conservation of mass

S. Shodiya; A. A. Aahar; N. Henry; A. N. Darus

2012-01-01T23:59:59.000Z

374

Note: Development of target changeable palm-top pyroelectric x-ray tube  

Science Conference Proceedings (OSTI)

A target changeable palm-top size x-ray tube was realized using pyroelectric crystal and detachable vacuum flanges. The target metals can be exchanged easily by attaching them on the brass stage with carbon tape. When silver and titanium palates (area: 10 mm{sup 2}) were used as targets, silver L{alpha} and titanium K lines were clearly observed by bombarding electrons on the targets for 90 s. The intensities were the same or higher than those of previously reported pyroelectric x-ray tubes. Chromium, iron, nickel, copper, and zinc K lines in the x-ray tube (stainless steel and brass) disappeared by replacing the brass stage and the stainless steel vacuum flange with a carbon stage and a glass tube, respectively.

Imashuku, Susumu; Kawai, Jun [Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501 (Japan)

2012-01-15T23:59:59.000Z

375

Heat transfer analysis of thermosiphons and U-tube ground source heat pumps.  

E-Print Network (OSTI)

??Ground source thermal energy transport systems have the potential to improve theefficiency of space heating.Two such systems, a thermosiphon and a vertical U-tube system, were (more)

Nakaoka, Joshua

2012-01-01T23:59:59.000Z

376

In-situ biofouling of ocean thermal energy conversion (OTEC) evaporator tubes  

Science Conference Proceedings (OSTI)

The Puerto Rico Center for Energy and Environmental Research equipped a LCU facility in 1100 m of water near Punta Tuna, Puerto Rico to measure in situ biofouling of simulated Ocean Thermal Energy Conversion evaporator tubes. The system consisted of two 5052 aluminum alloy and two titanium tubes, through which a continuous flow of ocean water was maintained. The tubes were cleaned three times and the fouling resistance was measured, showing only slight differences between the tubes with respect to heat transfer loss resulting from biofouling. In all units, the average fouling rate after cleaning was greater than before cleaning, and only after the first cleaning did the aluminum units show greater fouling rates than did the titanium. The titanium units showed a progressive increase in the fouling rates with each cleaning. The subsequent average fouling rates for all units after eight months were between 4 and 4.6 x 0.000010 sq m-k/W-day.

Sasscer, D.S. (Univ. of Puerto Rico, Mayaguez); Morgan, T. (Argonne National Lab., IL)

1981-05-01T23:59:59.000Z

377

Steady-state heat transfer in an inverted U-tube steam generator  

SciTech Connect

Experimental results are presented involving U-tube steam generator tube bundle local heat transfer and fluid conditions during steady-state, full-power operations performed at high temperatures and pressures with conditions typical of a pressurized water reactor (15.0 MPa primary pressure, 600 K hot-leg fluid temperatures, 6.2 MPa secondary pressure). The MOD-2C facility represents the state-of-the-art in measurement of tube local heat transfer data and average tube bundle secondary fluid density at several elevations, which allows an estimate of the axial heat transfer and void distributions during steady-state and transient operations. The method of heat transfer data reduction is presented and the heat flux, secondary convective heat transfer coefficient, and void fraction distributions are quantified for steady-state, full-power operations.

Boucher, T.J.

1986-01-01T23:59:59.000Z

378

Steady-state heat transfer in an inverted U-tube steam generator  

Science Conference Proceedings (OSTI)

Experimental results are presented involving U-tube steam generator tube bundle local heat transfer and fluid conditions during stead-state, full-power operations performed at high temperatures and pressures with conditions typical of a pressurized water reactor (15.0 MPa primary pressure, 600 K steam generator inlet plenum fluid temperatures, 6.2 MPa secondary pressure). The Semiscale (MOD-2C facility represents the state-of-the-art in measurement of tube local heat transfer data and average tube bundle secondary fluid density at several elevations, which allows an estimate of the axial heat transfer and void distributions during steady-state and transient operations. The method of heat transfer data reduction is presented and the heat flux, secondary convective heat transfer coefficient, and void fraction distributions are quantified for steady-state, full-power operations.

Boucher, T.J.

1987-01-01T23:59:59.000Z

379

Transcriptional analysis of the healing response of wounded nerves treated with collagen and silicone tubes  

E-Print Network (OSTI)

This study examines the transcriptional differences between nerve wounds treated with silicone tubes and those treated with collagen nerve regeneration templates. The primary motivation for the study is to test the hypothesis ...

Wong, Matthew Q

2008-01-01T23:59:59.000Z

380

Multi-tube thermal fuse for nozzle protection from a flame holding or flashback event  

SciTech Connect

A protection system for a pre-mixing apparatus for a turbine engine, includes: a main body having an inlet portion, an outlet portion and an exterior wall that collectively establish a fuel delivery plenum; and a plurality of fuel mixing tubes that extend through at least a portion of the fuel delivery plenum, each of the plurality of fuel mixing tubes including at least one fuel feed opening fluidly connected to the fuel delivery plenum; at least one thermal fuse disposed on an exterior surface of at least one tube, the at least one thermal fuse including a material that will melt upon ignition of fuel within the at least one tube and cause a diversion of fuel from the fuel feed opening to at least one bypass opening. A method and a turbine engine in accordance with the protection system are also provided.

Lacy, Benjamin Paul; Davis, Jr., Lewis Berkley; Johnson, Thomas Edward; York, William David

2012-07-03T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Conceptual Design of a Large, Passive Pressure-Tube Light Water Reactor  

E-Print Network (OSTI)

A design for a large, passive, light water reactor has been developed. The proposed concept is a pressure tube reactor of similar design to CANDU reactors, but differing in three key aspects. First, a solid SiC-coated ...

Hejzlar, P.

382

EDDY CURRENT EXAMINATION OF STEAM GENERATOR TUBES FROM PHWR POWER PLANTS USING ROTATING MAGNETIC FIELD TRANSDUCER  

E-Print Network (OSTI)

Abstract. This paper present the results obtained at examination of steam generator tubes samples made from Incoloy 800, using eddy current transducer with rotating magnetic field. The emission part creates a magnetic rotating field which induces eddy currents in the walls of tubes, the reception being made with an array of sensors. The method presents the advantages of a complete inspection of tubes surface at one passing. To increase the precision of discontinuity localization, a super resolution algorithm is used. The results are comparables with those obtained at the inspection with rotating probe, being obtained a good correlation, the speed of control being superior in the case of transducer with rotating magnetic field. 1.

Raimond Grimberg; Lalita Udpa; Alina Bruma; Rozina Steigmann; Adriana Savin; Satish S. Udpa

2007-01-01T23:59:59.000Z

383

Program on Technology Innovation: Giant Magnetoresistive Array-Based Eddy Current System for Tubing  

Science Conference Proceedings (OSTI)

This technical update summarizes the project activities involving the fabrication and testing of an array-based giant magnetoresistive (GMR) eddy current probe and the associated instrument for nondestructive evaluation (NDE) of tubing flaws.

2009-06-30T23:59:59.000Z

384

S&TR | January/February 2007: Tiny Tubes Make the Flow Go  

NLE Websites -- All DOE Office Websites (Extended Search)

in the same amount of time as a fire hose 10 times larger. You've entered the realm of carbon nanotubes, where flow rates are enhanced many times over. These tiny tubes have...

385

Comparison of Methods for Evaluating Nuclear Thermal Propulsion Tie-Tube Designs  

Science Conference Proceedings (OSTI)

One of the fundamental structural components in a nuclear thermal rocket design is the tie tube. Proper cooling and flow modeling is important both for the structural integrity of the reactor core and for proper design of downstream components that operate on the hydrogen exiting the tie tube. Two models have been developed. The first is a spreadsheet-based tool designed for sizing tie-tube components, considering mechanical stress and strain limits, deposited moderator power, thermal expansion along the flow path, and conduction from adjacent fuel blocks. The second is a three-dimensional SINDA/FLUINT model used as a benchmark, containing a complete finite-element fuel block and a 1/6th tie-tube model. This paper discusses the performance of both models, as well as the advantages and limitations of each.

Kapernick, Richard J. [Nuclear Systems Design Group, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Dixon, David D. [Nuclear Systems Design Group, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Department of Nuclear Engineering, University of Tennessee, Knoxville, TN 37996 (United States)

2008-01-21T23:59:59.000Z

386

EA-1131: Relocation of Neutron Tube Target Loading Operation, Los Alamos Laboratory, Los Alamos, New Mexico  

Energy.gov (U.S. Department of Energy (DOE))

This EA evaluates the environmental impacts of the proposal to relocate the Neutron Tube Target Loading operations at the U.S. Department of Energy Los Alamos National Laboratory in New Mexico from...

387

Field tests of 2- and 40-tube condensers at the East Mesa Geothermal Test Site  

DOE Green Energy (OSTI)

Two water-cooled isobutane condensers, one with 2 tubes and one with 40 tubes, were subjected to field tests at the East Mesa Geothermal Test Site to assess relative heat transfer performance in both surface evaporator and direct-contact evaporator modes. The five groups of tests established that field performance was below earlier laboratory-determined levels and that direct-contact evaporator mode performance was poorer than that for the surface evaporator mode. In all test situations, fluted condenser tubes performed better than smooth condenser tubes. Cooling water quality had no significant effect on performance, but brine preflash in the direct-contact mode did promote some relative performance improvement. Important implications of these results for binary geothermal power plants are that (1) working-fluid-side impurities can significantly degrade heat transfer performance of the power plant condensers and (2) provisions for minimizing such impurities may be required.

Murphy, R.W.; Domingo, N.

1982-05-01T23:59:59.000Z

388

Enhanced tubes for steam condensers. Volume 1, Summary of condensation and fouling; Volume 2, Detailed study of steam condensation  

SciTech Connect

Electric utility steam condensers typically use plain tubes made of titanium, stainless steel, or copper alloys. Approximately two-thirds of the total thermal resistance is on the water side of the plain tube. This program seeks to conceive and develop a tube geometry that has special enhancement geometries on the tube (water) side and the steam (shell) side. This ``enhanced`` tube geometry, will provide increased heat transfer coefficients. The enhanced tubes will allow the steam to condense at a lower temperature. The reduced condensing temperature will reduce the turbine heat rate, and increase the plant peak load capability. Water side fouling and fouling control is a very important consideration affecting the choice of the tube side enhancement. Hence, we have consciously considered fouling potential in our selection of the tube side surface geometry. Using appropriate correlations and theoretical models, we have designed condensation and water side surface geometries that will provide high performance and be cleanable using sponge ball cleaning. Commercial tube manufacturers have made the required tube geometries for test purposes. The heat transfer test program includes measurement of the condensation and water side heat transfer coefficients. Fouling tests are being run to measure the waterside fouling resistance, and to the test the ability of the sponge ball cleaning system to clean the tubes.

Webb, R.L.; Chamra, L.; Jaber, H.

1992-02-01T23:59:59.000Z

389

Eddy Current Data Quality Parameters for Inspection of Steam Generator Tubes: Volume 1: Bobbin Coil Probe  

Science Conference Proceedings (OSTI)

This report identifies parameters, methods of measurement, and acceptance criteria for a data quality check that can be performed during eddy current inspection of steam generator tubes. Its implementation is expected to result in improved accuracy in detecting and sizing tube degradation by ensuring that such measurements are performed only on quality data. Additionally, identifying unacceptable data during acquisition is expected to reduce overall inspection time by providing an opportunity to efficien...

2001-05-14T23:59:59.000Z

390

Ultrasonic Acceptance Small Diameter Boiler Tube Butt Weld: Project Status Update  

Science Conference Proceedings (OSTI)

This is an interim report documenting the progress of a multiyear project for developing an alternative ultrasonic testing (UT) acceptance guideline for small diameter boiler tube butt welds.BackgroundHistorically, small diameter boiler tube butt welds have either been examined for defects using radiography or not inspected, with the owner relying only on a hydrostatic pressure test at 1.5 times the design pressure to assess weld quality. This reliance is ...

2013-12-20T23:59:59.000Z

391

Science Videos from DOE's Joint Genome Institute on YouTube  

DOE Data Explorer (OSTI)

DOE's Joint Genome Institute began posting lab-produced videos on YouTube in September of 2008. Many of JGI's YouTube videos are of speakers' presentations at meetings and workshops; others may be promotional or educational in nature. They are freely available to the public for viewing and can be interactively shared or commented on. Users can subscribe and be notified when new videos are posted to their specific area of interest.

392

Postirradiation examination of pressure tubes 2954 and 3053: Corrosion, hydriding and fluence measurements  

SciTech Connect

Pressure Tubes 2954 and 3053 were removed from N Reactor in March 1987 for postirradiation examinations (PIE) including hydriding, corrosion, fluence and mechanical property measurements. The results of the corrosion, hydriding, and fluence measurements are the subject of this report. These data will be used to evaluate the trends in corrosion and hydriding behavior which are important to the structural integrity of the tubes. The trend evaluations as well as the mechanical property data are or will be reported elsewhere.

Chastain, S.A.; Trimble, D.J.; Boyd, S.M.

1988-08-01T23:59:59.000Z

393

Risks From Severe Accidents Involving Steam Generator Tube Leaks or Ruptures  

Science Conference Proceedings (OSTI)

The various types of corrosion observed in PWR steam generator tubes prompted the nuclear industry to initiate a program of Steam Generator Degradation Specific Management (SGDSM). This program's objective is to develop a cost-effective means to maintain plant safety while improving steam generator reliability. Critical to this program is an assessment of the impact of steam generator tube leakage or rupture during severe accidents. This study determined the contributions of these types of severe acciden...

1998-01-02T23:59:59.000Z

394

Evaluation of an Ultrasonic Search Unit for Examination of Steam Generator Tube U-Bends  

Science Conference Proceedings (OSTI)

Nondestructive examination (NDE) techniques with high flaw detection probability and accurate flaw characterization are essential to perform cost effective structural integrity assessments of steam generator tubes. Such assessments are essential in assuring the integrity of the primary coolant loop. Ultrasonic examination technology has been developed and demonstrated to provide high quality results for examination of steam generator tubes. These ultrasonic techniques have been focused on straight sectio...

2004-12-03T23:59:59.000Z

395

High strength Sn-Mo-Nb-Zr alloy tubes and method of making same  

DOE Patents (OSTI)

Tubes for use in nuclear reactors fabricated from a quaternary alloy comprising 2.5-4.0 wt% Sn, 0.5-1.5 wt% Mo, 0.5-1.5 wt% Nb, balance essentially Zr. The tubes are fabricated by a process of hot extrusion, heat treatment, cold working to size and age hardening, so as to produce a microstructure comprising elongated .alpha. grains with an acicular transformed .beta. grain boundary phase.

Cheadle, Brian A. (Deep River, CA)

1977-01-01T23:59:59.000Z

396

Plasma Sprayed Ni-Al Coatings for Safe Ending Heat Exchanger Tubes  

DOE Green Energy (OSTI)

Brookhaven National Laboratory (BNL) has developed thermally conductive composite liners for corrosion and scale protection in heat exchanger tubes exposed to geothermal brine. The liners cannot withstand roller expansion to connect the tubes to the tubesheet. It is not possible to line the ends of the tubes with the same material after roller expansion due to the nature of the current liner application process. It was requested that BNL evaluate plasma sprayed Ni-Al coatings for safe ending heat exchanger tubes exposed to geothermal brine. The tubes of interest had an internal diameter of 0.875 inches. It is not typical to thermal spray small diameter components or use such small standoff distances. In this project a nozzle extension was developed by Zatorski Coating Company to spray the tube ends as well as flat coupons for testing. Four different Ni-Al coatings were investigated. One of these was a ductilized Ni-AlB material developed at Oak Ridge National Laboratory. The coatings were examined by optical and scanning electron microscopy. In addition, the coatings were analyzed by X-ray diffraction and subjected to corrosion, tensile adhesion, microhardness and field tests in a volcanic pool in New Zealand.

Allen, M.L.; Berndt, C.C.; Otterson, D.

1998-11-01T23:59:59.000Z

397

One-Step Growth of Ge doped ZnO Tubes by Thermal Evaporation  

Science Conference Proceedings (OSTI)

In this paper we report a simple thermal evaporation technique (horizontal tube furnace) to grow the bulk-quantity of germanium (Ge) doped zinc oxide (ZnO) tubes on the Si substrate by using one-step thermal evaporation of a mixed powder of Ge and ZnO. The microstructure and optical properties of the Ge doped ZnO tubes have been investigated by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction, photoluminescence (PL) spectrometer and Raman spectrometer. The investigation of structural properties indicated that the structures consist of bulk quantities of cylindrical rod and tube with diameter around 1micron. EDX reveals that the tube structures have Ge, Zn and O{sub 2} compositions and XRD analysis indicated the product is mainly composed of Ge, zinc germanium oxide (Zn{sub 2}GeO{sub 4}) and small proportion of ZnO. Room temperature photoluminescence (PL) spectrum shows broad emission peaks around 400 nm, opening up a route to potential applications in future optoelectronic devices. Raman measurement also measured at room temperature for these tubes.

Jumidali, M. M. [School of Physics, Universiti Sains Malaysia (USM), 11800 Minden, Penang (Malaysia); Faculty of Applied Science, Universiti Teknologi MARA, 13500 Penang (Malaysia); Hashim, M. R. [School of Physics, Universiti Sains Malaysia (USM), 11800 Minden, Penang (Malaysia); Sulieman, K. M. [Faculty of Applied Science, Universiti Teknologi MARA, 13500 Penang (Malaysia)

2011-03-30T23:59:59.000Z

398

Conceptual design of a pressure tube light water reactor with variable moderator control  

SciTech Connect

This paper presents the development of innovative pressure tube light water reactor with variable moderator control. The core layout is derived from a CANDU line of reactors in general, and advanced ACR-1000 design in particular. It should be stressed however, that while some of the ACR-1000 mechanical design features are adopted, the core design basics of the reactor proposed here are completely different. First, the inter fuel channels spacing, surrounded by the calandria tank, contains a low pressure gas instead of heavy water moderator. Second, the fuel channel design features an additional/external tube (designated as moderator tube) connected to a separate moderator management system. The moderator management system is design to vary the moderator tube content from 'dry' (gas) to 'flooded' (light water filled). The dynamic variation of the moderator is a unique and very important feature of the proposed design. The moderator variation allows an implementation of the 'breed and burn' mode of operation. The 'breed and burn' mode of operation is implemented by keeping the moderator tube empty ('dry' filled with gas) during the breed part of the fuel depletion and subsequently introducing the moderator by 'flooding' the moderator tube for the 'burn' part. This paper assesses the conceptual feasibility of the proposed concept from a neutronics point of view. (authors)

Rachamin, R.; Fridman, E. [Reactor Safety Div., Inst. of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, POB 51 01 19, 01314 Dresden (Germany); Galperin, A. [Dept. of Nuclear Engineering, Ben-Gurion Univ. of the Negev, POB 653, Beer Sheva 84105 (Israel)

2012-07-01T23:59:59.000Z

399

A novel instrumented heat transfer tube for fluidization research. Topical report, January 1991--June 1992  

Science Conference Proceedings (OSTI)

A novel heat transfer probe capable of measuring simultaneously the time varying heat transfer coefficient around the surface of a heat transfer tube and the time varying static pressure fluctuations in the vicinity of the tube surface was built and tested. The probe consisted of a 2`` OD -- 1 inch ID stainless steel tube with a surface mounted thermocouple and pressure taps above and below the thermocouple flush with the surface of the tube. Simultaneous surface temperature data and local static pressure fluctuations were measured at different fluidizing conditions in beds of fine, 250 micron, sand. Time varying heat transfer coefficients were obtained by solving the unsteady conduction equation in the wall of the tube using the surface temperature measurements as the time varying boundary condition. Heat transfer coefficients obtained by this technique were of similar magnitude to those measured in similar beds at similar conditions. The time varying static pressure fluctuations obtained from the two pressure taps mounted in the tube wall contained considerable noise which made comparison, using Fourier Transform Techniques, of the temperature and pressure data impossible. However, visual observations of the two sets of data suggest that a correlation may exist but would require the filtering or elimination of noise from the pressure transducer.

Turton, R.; Clark, N.

1992-10-01T23:59:59.000Z

400

Testing and analysis of structural integrity of electrosleeved tubes under severe accident transients  

Science Conference Proceedings (OSTI)

The structural integrity of flawed steam generator tubing with Electrosleeves{trademark} under simulated severe accident transients was analyzed by analytical models that used available material properties data and results from high-temperature tests conducted on Electrosleeved tubes. The Electrosleeve material is almost pure Ni and derives its strength and other useful properties from its nanocrystalline microstructure, which is stable at reactor operating temperatures. However, it undergoes rapid grain growth, at the high temperatures expected during severe accidents, resulting in a loss of strength and a corresponding decrease in flow stress. The magnitude of this decrease depends on the time-temperature history during the accident. Failure tests were conducted at ANL and FTI on internally pressurized Electrosleeved tubes with 80% and 100% throughwall machined axial notches in tie parent tubes that were subjected to simulated severe accident temperature transients. The test results, together with the analytical model, were used to estimate the unaged flow stress curve of the Electrosleeved material at high temperatures. Failure temperatures for Electrosleeved tubes with throughwall and part-throughwall axial cracks of various lengths in the parent tubes were calculated for a postulated severe accident transient.

Majumdar, S.

1999-12-10T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

The Synergism Between Heat and Mass Transfer Additive and Advanced Surfaces in Aqueous LiBr Horizontal Tube Absorbers  

Science Conference Proceedings (OSTI)

Experiments were conducted in a laboratory to investigate the absorption of water vapor into a falling-film of aqueous lithium bromide (LiBr). A mini-absorber test stand was used to test smooth tubes and a variety of advanced tube surfaces placed horizontally in a single-row bundle. The bundle had six copper tubes; each tube had an outside diameter of 15.9-mm and a length of 0.32-m. A unique feature of the stand is its ability to operate continuously and support testing of LiBr brine at mass fractions {ge} 0.62. The test stand can also support testing to study the effect of the failing film mass flow rate, the coolant mass flow rate, the coolant temperature, the absorber pressure and the tube spacing. Manufacturers of absorption chillers add small quantities of a heat and mass transfer additive to improve the performance of the absorbers. The additive causes surface stirring which enhances the transport of absorbate into the bulk of the film. Absorption may also be enhanced with advanced tube surfaces that mechanically induce secondary flows in the falling film without increasing the thickness of the film. Several tube geometry's were identified and tested with the intent of mixing the film and renewing the interface with fresh solution from the tube wall. Testing was completed on a smooth tube and several different externally enhanced tube surfaces. Experiments were conducted over the operating conditions of 6.5 mm Hg absorber pressure, coolant temperatures ranging from 20 to 35 C and LiBr mass fractions ranging from 0.60 through 0.62. Initially the effect of tube spacing was investigated for the smooth tube surface, tested with no heat and mass transfer additive. Test results showed the absorber load and the mass absorbed increased as the tube spacing increased because of the improved wetting of the tube bundle. However, tube spacing was not a critical factor if heat and mass transfer additive was active in the mini-absorber. The additive dramatically affected the hydrodynamics of the falling film and a droplet flow regime was evident for testing at all tube spacings. The mechanical mixing of the advanced surfaces increased the mass transfer to about 75% of that observed on a smooth tube bundle, tested with heat and mass transfer additive. Testing with heat and mass transfer additive and advanced surfaces demonstrated a synergistic effect which doubled the mass absorbed from that observed with only the advanced surface. The overall film-side heat transfer coefficient for the advanced tube bundles doubled with the addition of 500-wppm of 2-ethyl-1- hexanol.

Miller, W.A.

1999-03-24T23:59:59.000Z

402

Heat Transfer Enhancement for Finned-Tube Heat Exchangers with Vortex Generators: Experimental and Numerical Results  

Science Conference Proceedings (OSTI)

A combined experimental and numerical investigation is under way to investigate heat transfer enhancement techniques that may be applicable to large-scale air-cooled condensers such as those used in geothermal power applications. The research is focused on whether air-side heat transfer can be improved through the use of finsurface vortex generators (winglets,) while maintaining low heat exchanger pressure drop. A transient heat transfer visualization and measurement technique has been employed in order to obtain detailed distributions of local heat transfer coefficients on model fin surfaces. Pressure drop measurements have also been acquired in a separate multiple-tube row apparatus. In addition, numerical modeling techniques have been developed to allow prediction of local and average heat transfer for these low-Reynolds-number flows with and without winglets. Representative experimental and numerical results presented in this paper reveal quantitative details of local fin-surface heat transfer in the vicinity of a circular tube with a single delta winglet pair downstream of the cylinder. The winglets were triangular (delta) with a 1:2 height/length aspect ratio and a height equal to 90% of the channel height. Overall mean fin-surface Nusselt-number results indicate a significant level of heat transfer enhancement (average enhancement ratio 35%) associated with the deployment of the winglets with oval tubes. Pressure drop measurements have also been obtained for a variety of tube and winglet configurations using a single-channel flow apparatus that includes four tube rows in a staggered array. Comparisons of heat transfer and pressure drop results for the elliptical tube versus a circular tube with and without winglets are provided. Heat transfer and pressure-drop results have been obtained for flow Reynolds numbers based on channel height and mean flow velocity ranging from 700 to 6500.

O'Brien, James Edward; Sohal, Manohar Singh; Huff, George Albert

2002-08-01T23:59:59.000Z

403

CFD Analysis Of Particle Transport In Axi-Symmetric Tubes Under The Influence Of Thermophoretic Force  

Science Conference Proceedings (OSTI)

In this study, we developed two frameworks to investigate the thermophoretic particulate deposition in non-isothermal tube flows conveying particles ranging from 10 to 300 nm; a one dimensional model where the variables are assumed to be uniform in each cross section perpendicular to the tube axis and an axi-symmetric model where the aforementioned assumption is relaxed. In the one dimensional model, the rate of mass deposition along the inner surface of the tube is computed based on the local thermophoretic velocity of the particulate phase at the wall. This velocity is proportional to the radial gradient of the temperature at the wall and is calculated via some empirical correlations for heat transfer in tube flows. In the axi-symmetric model, the rate of deposition is computed through the Fick s law after solving the species transport equation for the solid phase. We included the formation of the soot layer through moving the gas solid interface in both models. The tube effectiveness (the ratio of actual heat transfer to the maximum possible heat transfer) decreases due to the formation of the layer. Model outputs including deposited mass along the tube wall and the tube effectiveness drop have been compared against experiments. While the computed results through both models agree with the trend of experimental data, the axi-symmetric results are closer to the experiments in most cases. The calculated deposited mass is smaller (and closer to experiments) for the axi-symmetric model compared to the one dimensional model in all cases. This indicates that the axi-symmetric model estimates the deposited mass more accurately.

Abarham, Mehdi [University of Michigan; Zamankhan, Parsa [University of Michigan; Hoard, John W. [University of Michigan; Styles, Dan [Ford Motor Company; Sluder, Scott [ORNL; Storey, John Morse [ORNL; Lance, Michael J [ORNL; Assanis, Dennis [University of Michigan

2013-01-01T23:59:59.000Z

404

Steam generator tube integrity program. Semiannual report, August 1995--March 1996  

SciTech Connect

This report summarizes work performed by Argonne National Laboratory on the Steam Generator Tube Integrity Program from the inception of that program in August 1995 through March 1996. The program is divided into five tasks, namely (1) Assessment of Inspection Reliability, (2) Research on ISI (in-service-inspection) Technology, (3) Research on Degradation Modes and Integrity, (4) Development of Methodology and Technical Requirements for Current and Emerging Regulatory Issues, and (5) Program Management. Under Task 1, progress is reported on the preparation of and evaluation of nondestructive evaluation (NDE) techniques for inspecting a mock-up steam generator for round-robin testing, the development of better ways to correlate burst pressure and leak rate with eddy current (EC) signals, the inspection of sleeved tubes, workshop and training activities, and the evaluation of emerging NDE technology. Under Task 2, results are reported on closed-form solutions and finite element electromagnetic modeling of EC probe response for various probe designs and flaw characteristics. Under Task 3, facilities are being designed and built for the production of cracked tubes under aggressive and near-prototypical conditions and for the testing of flawed and unflawed tubes under normal operating, accident, and severe accident conditions. In addition, crack behavior and stability are being modeled to provide guidance on test facility design, to develop an improved understanding of the expected rupture behavior of tubes with circumferential cracks, and to predict the behavior of flawed and unflawed tubes under severe accident conditions. Task 4 is concerned with the cracking and failure of tubes that have been repaired by sleeving, and with a review of literature on this subject.

Diercks, D.R.; Bakhtiari, S.; Chopra, O.K. [and others

1997-04-01T23:59:59.000Z

405

PLASMA SPRAYED Ni-Al COATINGS FOR SAFE ENDING HEAT EXCHANGER TUBES  

DOE Green Energy (OSTI)

Brookhaven National Laboratory (BNL) has developed thermally conductive composite liners for corrosion and scale protection in heat exchanger tubes exposed to geothermal brine. The liners cannot withstand roller expansion to connect the tubes to the tubesheet. It is not possible to line the ends of the tubes with the same material after roller expansion due to the nature of the current liner application process. It was requested that BNL evaluate plasma sprayed Ni-Al coatings for safe ending heat exchanger tubes exposed to geothermal brine. The tubes of interest had an internal diameter of 0.875 inches. It is not typical to thermal spray small diameter components or use such small standoff distances. In this project a nozzle extension was developed by Zatorski Coating Company to spray the tube ends as well as flat coupons for testing. Four different Ni-Al coatings were investigated. One of these was a ductilized Ni-AIB material developed at Oak Ridge National Laboratory. The coatings were examined by optical and scanning electron microscopy. In addition, the coatings were analyzed by X-ray diffraction and subjected to corrosion, tensile adhesion, microhardness and field tests in a volcanic pool in New Zealand. It was determined that the Ni-Al coatings could be applied to a depth of two inches on the tube ends. When sprayed on flat coupons the coatings exhibited relatively high adhesion strength and microhardness. Polarization curves showed that the coating performance was variable. Measured corrosion potentials indicated that the Ni-Al coatings are active towards steel coated with thermally conductive polymers, thereby suggesting preferential corrosion. Corrosion also occurred on the coated coupons tested in the volcanic pool. This may have been exacerbated by the difficulty in applying a uniform coating to the coupon edges. The Ni-Al coatings applied to the tubes had significant porosity and did not provide adequate corrosion protection. This is associated with the short standoff distance and is not a reflection of the normal quality of plasma sprayed coatings. Even if coating porosity could be reduced, the coupling of an alloy coating to a polymer-based barrier coating in the same electrolyte is not recommended. Therefore, polymer coatings that can be field applied to the tube ends after roller expansion should be sought.

ALLAN,M.L.; OTTERSON,D.; BERNDT,C.C.

1998-11-01T23:59:59.000Z

406

The U-tube sampling methodology and real-time analysis of geofluids  

Science Conference Proceedings (OSTI)

The U-tube geochemical sampling methodology, an extension of the porous cup technique proposed by Wood [1973], provides minimally contaminated aliquots of multiphase fluids from deep reservoirs and allows for accurate determination of dissolved gas composition. The initial deployment of the U-tube during the Frio Brine Pilot CO{sub 2} storage experiment, Liberty County, Texas, obtained representative samples of brine and supercritical CO{sub 2} from a depth of 1.5 km. A quadrupole mass spectrometer provided real-time analysis of dissolved gas composition. Since the initial demonstration, the U-tube has been deployed for (1) sampling of fluids down gradient of the proposed Yucca Mountain High-Level Waste Repository, Armagosa Valley, Nevada (2) acquiring fluid samples beneath permafrost in Nunuvut Territory, Canada, and (3) at a CO{sub 2} storage demonstration project within a depleted gas reservoir, Otway Basin, Victoria, Australia. The addition of in-line high-pressure pH and EC sensors allows for continuous monitoring of fluid during sample collection. Difficulties have arisen during U-tube sampling, such as blockage of sample lines from naturally occurring waxes or from freezing conditions; however, workarounds such as solvent flushing or heating have been used to address these problems. The U-tube methodology has proven to be robust, and with careful consideration of the constraints and limitations, can provide high quality geochemical samples.

Freifeld, Barry; Perkins, Ernie; Underschultz, James; Boreham, Chris

2009-03-01T23:59:59.000Z

407

Structural characterization and structural/material similitude of hybrid composite tubes  

E-Print Network (OSTI)

Composites offer dramatically high stiffness to weight and strength to weight ratios which make them very desirable for use in offshore structures in deep water. In addition to high specific strength, composites offer the unique feature of being tailorable to the design. Hybrid composites, where multiple fiber types exist in a single matrix, further increase the functionality of composites by allowing the designer to add selectively stiffer, more costly fibers where the stresses are more critical and add less costly fibers where the stresses are less critical. This research focuses on the structural behavior of hybrid composite tubes when subjected to internal pressure, axial tension, and dynamic forces induced by wave and current interaction. A closed form, shear deformable shell code is developed to capture the strain state of hybrid composite tubes under axisymmetric loads and finite element analysis is used to determine the behavior of a composite tube subjected to dynamic loads and pressure loads. Scaling methods by means of structural/material similitude are also studied. For composites, these scaling laws depend not just on geometry, but also on constituent properties and the location and orientation of the constituents in the system. Through similitude, the behavior of tubes which cannot be tested easily can be verified using tubes which are easier to test or have already been tested.

Liggett, Glade Michael

1996-01-01T23:59:59.000Z

408

Correlations to predict frictional pressure loss of hydraulic-fracturing slurry in coiled tubing  

Science Conference Proceedings (OSTI)

Compared with conventional-tubing fracturing, coiled-tubing (CT) fracturing has several advantages. CT fracturing has become an effective stimulation technique for multizone oil and gas wells. It is also an attractive production-enhancement method for multiseam coalbed-methane wells, and wells with bypassed zones. The excessive frictional pressure loss through CT has been a concern in fracturing. The small diameter of the string limits the cross-sectional area open to flow. Furthermore, the tubing curvature causes secondary flow and results in extra flow resistance. This increased frictional pressure loss results in high surface pumping pressure. The maximum possible pump rate and sand concentration, therefore, have to be reduced. To design a CT fracturing job properly, it is essential to predict the frictional pressure loss through the tubing accurately. This paper presents correlations for the prediction of frictional pressure loss of fracturing slurries in straight tubing and CT. They are developed on the basis of full-scale slurry-flow tests with 11/2-in. CT and slurries prepared with 35 lbm/1,000 gal of guar gel. The extensive experiments were conducted at the full-scale CT-flow test facility. The proposed correlations have been verified with the experimental data and actual field CT-fracturing data. Case studies of wells recently fractured are provided to demonstrate the application of the correlations. The correlations will be useful to the CT engineers in their hydraulics design calculations.

Shah, S.; Zhoi, Y.X.; Bailey, M.; Hernandez, J. [University of Oklahoma, Norman, OK (United States)

2009-08-15T23:59:59.000Z

409

Outgassing rate of the copper-plated beam tube for ISABELLE  

Science Conference Proceedings (OSTI)

The ultrahigh vacuum system of the intersecting storage accelerator, ISABELLE, will consist of two interlaced rings of stainless steel beam tubes with a circumference 2-1/2 miles each. To obtain a good heat conduction during bakeout and to reduce the resistive wall instability during beam operation, a lmm thick copper coating will be electroplated to the outer surface of this 1.5 mm thick beam tube. To minimize the beam loss due to beam-gas collision, the pressure inside the beam tube is required to be 1 x 10/sup -11/ Torr (N/sub 2/ equivalent) or less. To achieve this ultrahigh vacuum, the outgassing rate of the 304 LN stainless steel tubes has been reduced to approx. 1 x 10/sup -13/ Torr. l/cm/sup 2/. sec by vacuum firing at 950/sup 0/C for one hour. However, during acid-bath electroplating of copper, significant amount of hydrogen will be reintroduced and trapped in stainless steel which will substantially increase the outgassing rate (to approx. 2 x 10/sup -12/ Torr . l/cm/sup 2/ sec). The outgassing characteristics of these copper-plated beam tubes are studied and discussed within the scope of diffusion and energy of activation. Methods to reduce the outgassing rate to an acceptable level (approx. 1 x 10/sup -13/ Torr . l/cm/sup 2/ . sec) are also given.

Hseuh, H.C.; Gaudet, E.F.

1981-01-01T23:59:59.000Z

410

Heat-transfer characteristics of climbing film evaporation in a vertical tube  

SciTech Connect

Heat-transfer characteristics of climbing film evaporation were experimentally investigated on a vertical climbing film evaporator heated by tube-outside hot water. The experimental setup was designed for determining the effect of the height of feed water inside a vertical tube and the range of temperature difference on local heat transfer coefficient inside a vertical tube (h{sub i}). In this setup, the height of feed water was successfully controlled and the polypropylene shell effectively impedes the heat loss to the ground. The results indicated that a reduction in the height of feed water contributed to a significant increase in h{sub i} if no dry patches around the wall of the heated tube appeared inside the tube. The height ratio of feed water R{sub h} = 0.3 was proposed as the optimal one as dry patches destroyed the continuous climbing film when R{sub h} is under 0.3. It was found that the minimum temperature difference driving climbing film evaporation is suggested as 5 C due to a sharp reduction in h{sub i} for temperature difference below 5 C. The experiment also showed that h{sub i} increased with an increase in temperature difference, which proved the superiority of climbing film evaporation in utilizing low-grade surplus heating source due to its wide range of driving temperature difference. The experimental results were compared with the previous literature and demonstrated a satisfactory agreement. (author)

Yang, Luopeng; Chen, Xue; Shen, Shengqiang [Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024 (China)

2010-09-15T23:59:59.000Z

411

Elastic response of water-filled fiber composite tubes under shock wave loading  

Science Conference Proceedings (OSTI)

We experimentally and numerically investigate the response of fluid-filled filament-wound composite tubes subjected to axial shock wave loading in water. Our study focuses on the fluid structure interaction occurring when the shock wave in the fluid propagates parallel to the axis of the tube, creating pressure waves in the fluid coupled to flexural waves in the shell. The in-house-developed computational scheme couples an Eulerian fluid solver with a Lagrangian shell solver, which includes a new and simple material model to capture the response of fiber composites in finite kinematics. In the experiments and simulations we examine tubes with fiber winding angles equal to 45 and 60 , and we measure the precursor and primary wave speeds, hoop and longitudinal strains, and pressure. The experimental and computational results are in agreement, showing the validity of the computational scheme in complex fluid structure interaction problems involving fiber composite materials subjected to shock waves. The analyses of the measured quantities show the strong coupling of axial and hoop deformations and the significant effect of fiber winding angle on the composite tube response, which differs substantially from that of a metal tube in the same configuration.

Perotti, Luigi E. [California Institute of Technology, Pasadena; Deiterding, Ralf [ORNL; Inaba, Kazuaki [Tokyo Institute of Technology; Shepherd, Joseph E [California Institute of Technology, Pasadena; Ortiz, Michael [California Institute of Technology, Pasadena

2013-01-01T23:59:59.000Z

412

I. Experimental spectroscopic temperature measurements in the reflected wave region of a shock tube using the OH ^2? ? ^2? band system. II. Shock tube measurements of the absorption oscillator strength for the ^2? ? ^2? band system of hydroxide.  

E-Print Network (OSTI)

?? I. Experimental measurements of the population temperature behind the reflected shock in a shock tube are presented. Emission from two wavelength intervals of the (more)

Watson, Ronald

1963-01-01T23:59:59.000Z

413

Steam Generator Management Program: Conditions Causing Lead Stress Corrosion Cracking of Steam Generator Tubing, Alloy 690TT  

Science Conference Proceedings (OSTI)

Tube damage by intergranular attack/stress corrosion cracking (IGA/SCC) continues to result in steam generator tubing degradation, plugging of tubes, and eventual replacement of steam generators. The present strategy for mitigating IGA/SCC is based on the assumption that crack initiation and propagation rates depend on the at-temperature pH (pHT), the electrochemical potential, and the development of crevice areas. Accordingly, all plants have adopted the practice of ...

2013-12-18T23:59:59.000Z

414

Final report: Research project chemical milling of counterbore recesses in the uranium wall of Zircaloy-2 clad uranium tubes  

SciTech Connect

This report discusses the development of an etchant composition to chemically mill counterbore recesses in each end of the uranium walls of Zircaloy-2 clad uranium tubes.

Atkins, D.C. [United States Chemical Milling Corp., Manhattan Beach, CA (United States)

1994-07-01T23:59:59.000Z

415

Postirradiation examination of Pressure Tubes 2755 and 1054 Part 1: Dimensional, hydride, inner surface defects, and corrosion measurements: Addendum 1  

Science Conference Proceedings (OSTI)

This addendum is issued to document additional postirradiation examinations that were conducted on Pressure Tubes 2755 and 1054 for evaluation of inner surface defects, corrosion and hydride measurements.

Chastain, S.A.; Trimble, D.J.

1986-04-01T23:59:59.000Z

416

Evaporation heat transfer and friction characteristics of R-134a flowing downward in a vertical corrugated tube  

SciTech Connect

Differently from most previous studies, the heat transfer and friction characteristics of the pure refrigerant HFC-134a during evaporation inside a vertical corrugated tube are experimentally investigated. The double tube test sections are 0.5 m long with refrigerant flowing in the inner tube and heating water flowing in the annulus. The inner tubes are one smooth tube and two corrugated tubes, which are constructed from smooth copper tube of 8.7 mm inner diameter. The test runs are performed at evaporating temperatures of 10, 15, and 20 C, heat fluxes of 20, 25, and 30 kW/m{sup 2}, and mass fluxes of 200, 300, and 400 kg/m{sup 2} s. The quality of the refrigerant in the test section is calculated using the temperature and pressure obtained from the experiment. The pressure drop across the test section is measured directly by a differential pressure transducer. The effects of heat flux, mass flux, and evaporation temperature on the heat transfer coefficient and two-phase friction factor are also discussed. It is found that the percentage increases of the heat transfer coefficient and the two-phase friction factor of the corrugated tubes compared with those of the smooth tube are approximately 0-10% and 70-140%, respectively. (author)

Aroonrat, Kanit; Wongwises, Somchai [Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi, Bangmod, Bangkok 10140 (Thailand)

2011-01-15T23:59:59.000Z

417

Interim Report: Coiled Tubing Drilling and Intervention System Using Cost Effective Vessel  

NLE Websites -- All DOE Office Websites (Extended Search)

DOCUMENT TITLE: DOCUMENT TITLE: Self Supporting Riser Technology to Enable Coiled Tubing Intervention for Deepwater Wells Document No.: 08121-1502-12 RPSEA PROJECT TITLE: Coil Tubing Drilling and Intervention System Using a Cost Effective Vessel RPSEA Project No.: 08121-1502 01 April 2011 Charles R. Yemington, PE Project Manager Nautilus International 400 North Sam Houston Parkway East, Suite 105 Houston, Texas 77060 RPSEA Project No.: 08121-1502 Coiled Tubing Drilling and Intervention System Using a Cost Effective Vessel RPSEA Project 08121-1502 01 April 2011 Page 2 of 91 LEGAL NOTICE This report was prepared by Nautilus International, LLC. as an account of work sponsored by the Research Partnership to Secure Energy for America (RPSEA). RPSEA members, the

418

The Thermal Delocalization of the Flux Tubes in Mesons and Baryons  

Science Conference Proceedings (OSTI)

The gluon action density in a static mesonic system is analyzed at finite temperature using lattice QCD techniques in quenched QCD. The obtained results are compared to predictions of bosonic string models for the flux-tube profiles to understand the changes of the flux-tube profiles with temperature. The mesonic flux tube curved-width profile is found to compare well with that of the bosonic string at large distances. In the intermediate distance region, a free bosonic string behaviour is observed for analysis performed on highly UV-filtered gauge configurations. Extending the analysis to the static baryon reveals a delocalization of the baryonic node in the Y-shape gluonic configuration observed at zero temperature. At finite temperature, a filled delta-shaped configuration is observed, even at large distances. We study a baryonic string model at finite temperature.

Bakry, Ahmed S.; Leinweber, Derek B.; Williams, Anthony G. [Special Research Center for the Subatomic Structure of Matter, Departement of Physics, Adelaide, South Australia 5005 (Australia)

2011-05-24T23:59:59.000Z

419

A Review of Some Degradation Mechanisms in CANDU Steam Generator Tubing  

SciTech Connect

The first CANDU (Canadian Deuterium Uranium) pressurized heavy water reactor (PHWR) went into operation in July 1971. Today, there are several units in operation at the Pickering, Bruce, and Darlington sites in Ontario, Canada. The steam generator tubing materials were manufactured from Monel 400, Inconel 600, and Incoloy 800 for the Pickering, Bruce, and Darlington respectively and are subjected to different operating conditions. This paper presents a review of some of the various types of degradation mechanisms that have been observed on these tubing materials over the operating period of the respective plants. The results presented are based on the metallurgical examination of removed tubes. The mechanisms that have been observed include pitting, stress corrosion cracking, intergranular attack, fretting, and erosion corrosion. The nature of the flaws and causative factors (if known) are discussed. (authors)

Ogundele, G.; Clark, M.; Goszczynski, G.; Lloyd, A. [Kinectrics, Inc., 800 Kipling Avenue Toronto, Ontario M8Z 6C4 (Canada); Pagan, S. [Ontario Power Generation, 700 University Avenue Toronto, Ontario, M5G 1X6 (Canada); Sedman, K. [Bruce Power, P.O. Box 3000 177 Tie Rd., R.R. 2, Tiverton, Ontario N0G 2T0 (Canada); King, P. [Babcock and Wilcox (Canada)

2006-07-01T23:59:59.000Z

420

High field pulsed microwiggler comprising a conductive tube with periodically space slots  

DOE Patents (OSTI)

A microwiggler assembly produces large magnetic fields for oscillating ched particle beams, particularly electron beams for free electron laser (FEL) application. A tube of electrically conductive material is formed with radial slots axially spaced at the period of the electron beam. The slots have alternate 180.degree. relationships and are formed to a maximum depth of 0.6 to 0.7 times the tube circumference. An optimum slot depth is selected to eliminate magnetic quadrupole fields within the microwiggler as determined from a conventional pulsed wire technique. Suitable slot configurations include single slits, double slits, triple slits, and elliptical slots. An axial electron beam direction is maintained by experimentally placing end slits adjacent entrance and exit portions of the assembly, where the end slit depth is determined by use of the pulsed wire technique outside the tube.

Warren, Roger W. (Santa Fe, NM)

1992-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

NASA Lewis Stirling SPRE testing and analysis with reduced number of cooler tubes  

DOE Green Energy (OSTI)

Free-piston Stirling power converters are a candidate for high capacity space power applications. The Space Power Research Engine (SPRE), a free-piston Stirling engine coupled with a linear alternator, is being tested at the NASA Lewis Research Center in support of the Civil Space Technology Initiative. The SPRE is used as a test bed for evaluating converter modifications which have the potential to improve converter performance and for validating computer code predictions. Reducing the number of cooler tubes on the SPRE has been identified as a modification with the potential to significantly improve power and efficiency. This paper describes experimental tests designed to investigate the effects of reducing the number of cooler tubes on converter power, efficiency and dynamics. Presented are test results from the converter operating with a reduced number of cooler tubes and comparisons between this data and both baseline test data and computer code predictions.

Wong, W.A.; Cairelli, J.E.; Swec, D.M.; Doeberling, T.J.; Lakatos, T.F. [National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center; Madi, F.J. [Sverdrup Technology, Inc., Cleveland, OH (United States). Lewis Research Center Group

1994-09-01T23:59:59.000Z

422

Analysis of field-performance data on shell-and-tube heat exchangers in geothermal service  

DOE Green Energy (OSTI)

Analysis of field performance data from a binary cycle test loop using geothermal brine and a hydrocarbon working fluid is reported. Results include test loop operational problems, and shell-and-tube heat exchanger performance factors such as overall heat transfer coefficients, film coefficients, pinch points, and pressure drops. Performance factors are for six primary heaters having brine in the tubes and hydrocarbon in the shells in counterflow, and for a condenser having cooling water in the tubes and hydrocarbon in the shell. Working fluids reported are isobutane, 90/10 isobutane/isopentane, and 80/20 isobutane/isopentane. Performance factors are for heating each working fluid at supercritical conditions in the vicinity of their critical pressure and temperature and condensing the same fluid.

Silvester, L.F.; Doyle, P.T.

1982-03-01T23:59:59.000Z

423

Mathematical model of a tube furnace for catalytic conversion of hydrocarbons  

Science Conference Proceedings (OSTI)

The tube furnace is a complex unit in which there are hundreds of reaction tubes and coils for heating the reaction mixture, gas, air, steam and water. Optimum design of such a unit can be done only with a mathematical model of it. A number of physicochemical processes occur in the reaction furnace: conversions of natural gas with heat supplied through the wall of the tube, combustion of fuel in the firebox, transfer of heat from the radiating walls or flame to the reaction tubes, heating of the vapor-gas mixture and other flows in the convective zone of the furnace. These processes are interrelated and there are some difficulties in writing a mathematical model for the furnace. We have adopted the following principle for construction of a model: individual processes are being modeled and the starting data for calculation of these are the results of modeling of other processes. Calculation is made by sequential approximations until material and thermal balances are observed for all processes, as is indicated on the calculation flowsheet. Thermal calculations were made by methods discussed in (2). Modeling the tube furnace on a computer makes it possible to determine its working characteristics and range of safe operation. Computer calculations permit the time required for design of furnaces to be reduced substantially and the quality of the design to be improved. Higher demands are beingmade on tube furnaces for catalytic conversion of natural gas both with regard to operating reliability and economy because of the sharp increase of the unit capacities of ammonia and methanol synthesis plants.

Stepanov, A.V.; Sul'zhik, N.I.; Kadygrob, L.A.; Gorlov, V.F.; Mishin, V.P.; Dugach, V.V.

1981-02-01T23:59:59.000Z

424

ANALYTICAL STUDY OF SOME ASPECTS OF VORTEX TUBES FOR GAS-PHASE FISSION HEATING  

DOE Green Energy (OSTI)

Several problems connected with vortex cavity reactors were studied analytically. They include, the generation of high-strength vortices by utilization of bleed through a porous tube wall to stabilize the shear layer on the wall; the nuclear criticality problem; the suitability of various compounds of plutonium as gaseous fissionable materials; and the problem of retaining the fission fragments within the vortex tube. It is concluded that the shear layer on the vortex tube wall can be stabilized if a mass flow greater than or equal to the vortex through flow is bled through the porous wall, and that the tangential Mach numbers which can be obtained are then slightly more than one-half the inviscid values. Beryllium oxide or graphite-moderated reactors of reasonable size and weight can attain criticality if the product of the hydrogen pressure in the vortex core and the maximum value of the ratio of fissionable gas density to hydrogen density in the tube is greater than about 100 atm. The reactor weights are then in the order of 10,000 lb or less. Of the several compounds of plutonium considered as gaseous fuel carriers, plutonium trifluoride and plutonium tribromide appear to be the most promising. It is probable that they can be held in gaseous form in hydrogen, under the desired concentrations. The rate of loss of fission fragments from the vortex tube can be reduced to a small fraction of the rate of their generation by making the vortex tubes about twice the minimum size that is allowable for satisfactory retention of the fissionable material. (auth)

Kerrebrock, J.L.; Lafyatis, P.G.

1958-07-21T23:59:59.000Z

425

On-line mechanical tube cleaning for steam electric power plants. Final report  

SciTech Connect

In July 1991, Superior I.D. Tube Cleaners, Inc. (SIDTEC{trademark}) received a grant through the Department of Energy and the Energy Related Invention Program to conduct a long term demonstration of a proprietary technology for on-line mechanical condenser tube cleaning in thermal Power plants on open or once-through cooling water systems where the warmed condenser cooling water is discharged through a canal. The purpose of the demonstration was to confirm and establish the use of this mechanical method as an alternative to the application of chemical biocides in condenser cooling water for the control of biofouling, the growth of micro-organisms which can reduce a unit`s operating efficiency. The SIDTEC on-line mechanical tube cleaner, the Rocket{trademark}, is used to physically remove accumulated deposits on the water side of the main steam condenser, and the non-intrusive tube cleaner recovery system, the Skimmer{trademark}, is used to recover and recirculate tube cleaners. The periodic circulation of tube cleaners can maintain optimum condenser cleanliness and improve unit heat rate. Thermal power plants which discharge condenser cooling water through a canal now have a viable alternative to the chemical treatment of condenser cooling water, whether the principal foulant is biofouling, chemical scaling, silting, or a combination of the three. At prices competitive with scale inhibitors, and a fraction of competing mechanical systems, this technology is provided as a service requiring no capital investment; minimal retrofit modifications to plant structures or equipment; can be installed and maintained without a unit shutdown; does not add any restrictions in the cooling water system; and is environmentally benign.

Not Available

1994-02-18T23:59:59.000Z

426

LMFBR steam generator development: duplex bayonet tube steam generator. Volume II  

SciTech Connect

This report represents the culmination of work performed in fulfillment of ERDA Contract AT(11-1)-2426, Task Agreement 2, in which alternate steam generator designs were developed and studied. The basic bayonet tube generator design previously developed by C-E under AEC Contract AT(11-1)-3031 was expanded by incorporating duplex heat transfer tubes to enhance the unit's overall safety and reliability. The effort consisted of providing and evaluating conceptual designs of the evaporator, superheater and reheater components for a large plant LMFBR steam generator (950 MWt per heat transport loop). (auth)

DeFur, D.D.

1975-04-01T23:59:59.000Z

427

Literature survey on vertical tube evaporators (VTE's). Part I. Bibliographical entries  

DOE Green Energy (OSTI)

A bibliography of the literature pertinent to vertical tube heat exchangers for OTEC application has been prepared. More than 200 references from different sources (journals, books, companies and government reports) on heat exchanger design, operation and performance have been identified and surveyed for a two part report on the state-of-the-art of vertical tube evaporators. This bibliography represents Part I. Each bibliographical entry has been coded to facilitate references to particular articles in the narrative account of the survey represented in Part II.

Rothfus, R.R.; Neuman, C.P.; Lavi, G.H.; Farthing, G.A. Jr.; Prengaman, R.

1977-07-01T23:59:59.000Z

428

High-voltage supply for neutron tubes in well-logging applications  

DOE Patents (OSTI)

A high voltage supply is provided for a neutron tube used in well logging. The biased pulse supply of the invention combines DC and full pulse techniques and produces a target voltage comprising a substantial negative DC bias component on which is superimposed a pulse whose negative peak provides the desired negative voltage level for the neutron tube. The target voltage is preferably generated using voltage doubling techniques and employing a voltage source which generates bipolar pulse pairs having an amplitude corresponding to the DC bias level.

Humphreys, D.R.

1982-09-15T23:59:59.000Z

429

Hydrogen consentration meter utilizing a diffusion tube composed of 2 1/4 C r  

DOE Patents (OSTI)

A diffusion tube hydrogen meter for improving the sensitivity and response time for the measurement of hydrogen in liquid sodium. The improved hydrogen meter has a composite membrane composed of pure nickel sleeve fitted, for example, over a 2 1/4 Cr-1 Mo steel or niobium diffusion tube. Since the hydrogen permeation rate through 2 1/4 Cr-1 Mo steels is a factor of four higher than pure nickel, and the permeation rate of hydrogen through niobium is two orders of magnitude greater than the 2 1/4 Cr-1 Mo steel, this results in a decrease in response time and an increase in the sensitivity.

Roy, Prodyot (Saratoga, CA); Sandusky, David W. (San Jose, CA); Hartle, Robert T. (San Jose, CA)

1979-01-01T23:59:59.000Z

430

Bushing retention system for thermal medium cooling delivery tubes in a gas turbine rotor  

SciTech Connect

Bushings are provided in counterbores for wheels and spacers for supporting thermal medium cooling tubes extending axially adjacent the rim of the gas turbine rotor. The retention system includes a retaining ring disposed in a groove adjacent an end face of the bushing and which retaining ring projects radially inwardly to prevent axial movement of the bushing in one direction. The retention ring has a plurality of circumferentially spaced tabs along its inner diameter whereby the ring is supported by the lands of the tube maintaining its bushing retention function, notwithstanding operation in high centrifugal fields and rotation of the ring in the groove into other circular orientations.

Mashey, Thomas Charles (Coxsackie, NY)

2002-01-01T23:59:59.000Z

431

Fundamental Kinetics Database Utilizing Shock Tube Measurements (Volume 1 and Volume 2)  

DOE Data Explorer (OSTI)

The data from shock tube experiments generally takes three forms: ignition delay times, species concentration time-histories and reaction rate measurements. Volume 1 focuses on ignition delay time data measured and published by the Shock Tube Group in the Mechanical Engineering Department of Stanford University. The cut-off date for inclusion into this volume was January 2005. Volume 2 focuses on species concentration time-histories and was cut off December 2005. The two volumes are in PDF format and are accompanied by a zipped file of supporting data.

Davidson, D.F.; Hanson, R.K

432

Applications of the Strong Heat Transformation by Pulse Flow in the Shell and Tube Heat Exchanger  

E-Print Network (OSTI)

This article deals with the heat exchange coefficient varied with pulse frequency in the pulsation tube with different flow forms. The findings show that heat can be exchanged coefficient with the pulse frequency, and it has an optimal frequency. The laminar flow and turbulent flow have approximately the same optimal frequency, i.e., about 8 Hz. When the pulsation source was placed in the upstream and downstream position, the heat transformation was completed dissimilarly. These results are coincident with previous experiments. The article also gives some information on the applications of the heat transformation by pulse flow in the shell and tube heat exchanger.

Chen, Y.; Zhao, J.

2006-01-01T23:59:59.000Z

433

Wind Farm and Turbine Videos from the Alternative Energy Institute on YouTube  

DOE Data Explorer (OSTI)

The Alternative Energy Institute (AEI) was formed in 1977 at West Texas State University (now West Texas A&M University) as an outgrowth of wind energy research begun in 1970. AEI's primary emphasis has been placed on wind energy, though certain research and education are also on solar energy. Recognized both nationally and internationally, AEI is proud to be the major information resource of wind energy for the State of Texas [Copied from AEI home page on YouTube]. AEI joined YouTube toward the end of 2007 and provides video clips showing testing of turbine designs, the wind farm, etc.

434

Characterization of an Aerosol Shock Tube Facility for Heterogeneous Combustion Studies  

E-Print Network (OSTI)

Combustion is responsible for providing energy for many applications, especially in propulsion and rocket propellants. Shock tubes provide a controlled, repeatable means of studying combustion characteristics; although, most of these studies require the fuel in a mixture to exist in pure gas-phase. This makes it challenging to test low-vapor-pressure fuels that tend to remain in condensed form. Low-vapor-pressure fuels are commonly used in many combustion applications, making combustion studies of these fuels important. A method to study low-vapor-pressure fuels using a shock tube approach is to inject the fuel into the shock tube as tiny, uniformly-sized aerosol droplets. The sub-micron-sized aerosol droplets remain uniformly suspended in the shock tube prior to running the experiment. An incident shock wave vaporizes the liquid fuel droplets, then the reflected shock wave initiates ignition of the mixture. This study presents the characterization of an aerosol fuel injection method to the shock tube to study the combustion of low-vapor-pressure fuels. An aerosol generator was used to produce repeatable, uniformly-sized fuel droplets, and flow controllers were used to control and measure oxygen and argon dilution gas injected into the shock tube. A technique was developed to ensure consistent and repeatable aerosol fuel production rates over which calibration curves were found. This study presents the ignition delay times for C7H16 (? = 1.0) at a pressure of 2.0 atm for temperatures from 1220 - 1427 K, C7H8 (? = 1.0) at 1.9 atm over a temperature range of 1406 1791 K, and C12H26 (? = 0.3) at 3.0 atm for the temperature range of 1293 1455 K. The ignition delay times for heptane and toluene were compared to the literature values at the same conditions and were found to be in good agreement. Laser extinction (visible laser at 632nm) was used to verify the presence of aerosol fuel droplets inside the shock tube for dodecane, but showed the heptane aerosol vaporized upon injection into the shock tube. Initial laser absorption (3.39 m) measurements were also taken. This aerosol technique was found to successfully evaluate combustion effects of low-vapor-pressure fuels; however, was limited by the range of possible fuel concentrations. Further work needs to be performed on the verification of aerosol spatial uniformity and obtaining higher fuel concentrations.

Sandberg, Lori Marie

2013-05-01T23:59:59.000Z

435

Mercury Lamps Recycling Fluorescent light-tubes, compact fluorescent bulbs, mercury and sodium vapor lamps, ultraviolet and  

E-Print Network (OSTI)

Mercury Lamps Recycling Fluorescent light-tubes, compact fluorescent bulbs, mercury and sodium light tubes are recycled. They are made from aluminum and metal. Aluminum is a silver-white metal and is very light in weight and strong. Because aluminum is ductile, it can be drawn into wires or pressed

Ungerleider, Leslie G.

436

Forced convection heat transfer in the transition region between laminar and turbulent flow for a vertical circular tube  

Science Conference Proceedings (OSTI)

In this study, first results of the heat transfer characteristic of a vertical double tube heat exchanger were determined. The heat exchanger was operated under cocurrent-flow conditions. The Reynolds-number was varied in the transition region between ... Keywords: circular tube, forced convection, heat transfer, transition region

D. Huber; H. Walter

2010-07-01T23:59:59.000Z

437

Optimization methodology assessment for the inlet velocity profile of a hydraulic turbine draft tube: part I--computer optimization techniques  

Science Conference Proceedings (OSTI)

In recent years, numerical and experimental investigations on the draft tube performance have confirmed the importance of the inlet swirling flow created by the runner vanes. The results indicate that it is still a challenge to get the optimal flow distribution ... Keywords: CFD, Draft tube, Hydraulic turbine, Optimization algorithms

Sergio Galvn; Carlos Rubio; Jess Pacheco; Crisanto Mendoza; Miguel Toledo

2013-01-01T23:59:59.000Z

438

Ion Trapping for Ion Mobility Spectrometry Measurements in a Cyclical Drift Tube  

E-Print Network (OSTI)

us to consider new types of mobility measurements. In traditional IMS instruments, R scales as (ELIon Trapping for Ion Mobility Spectrometry Measurements in a Cyclical Drift Tube Rebecca S. Glaskin 47405, United States ABSTRACT: A new ion trapping technique, involving the accumulation of ions

Clemmer, David E.

439

Ellipsoidal model of the rise of a Taylor bubble in a round tube T. Funada a  

E-Print Network (OSTI)

November 2004 Abstract The rise velocity of long gas bubbles (Taylor bubbles) in round tubes is modeled in Eo; the composition of these separate power laws emerge as 0301-9322/$ - see front matter ? 2005 rising steadily in a li- quid is in a balance of buoyant weight and drag. It is natural to think

Joseph, Daniel D.

440

Anomalous electron trapping by magnetic flux tubes and electric current vortices  

E-Print Network (OSTI)

Anomalous electron trapping by magnetic flux tubes and electric current vortices F. Bentosela, a current vortex in the plane. In this case the flux is zero; there is a pair of bound states for a weak with a nonhomogeneous magnetic field B , and investigate the corresponding Pauli Hamiltonian. We prove a lower bound

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

What is a flux tube? On the magnetic field topology of buoyant flux structures  

E-Print Network (OSTI)

What is a flux tube? On the magnetic field topology of buoyant flux structures Fausto Cattaneo study the topology of field lines threading buoyant magnetic flux struc- tures. The magnetic structures ­ Sun: interior ­ Sun: magnetic fields ­ Stars: spots 1 Current address: Department of Mathematics

442

Bond Graph Model of a Vertical U-Tube Steam Condenser Coupled with a Heat Exchanger  

E-Print Network (OSTI)

Bond Graph Model of a Vertical U-Tube Steam Condenser Coupled with a Heat Exchanger K. Medjaher1+ A and thus the bottom well acts as a heat exchanger. The storage of hydraulic and thermal energies steam condenser; Heat exchanger; Bond graph 1. Introduction Modern process engineering plants

Paris-Sud XI, Université de

443

Vertical Concentric Tube Ground Couoled Heat Exchangers V. C. Mei and S. K. Fischer*  

E-Print Network (OSTI)

#12;Vertical Concentric Tube Ground Couoled Heat Exchangers V. C. Mei and S. K. Fischer* Abstract exchangers for use in heat-pump applications is described. The experimental apparatus consists. This heat exchanger was placed in a 0.20-m (8-in.) inside-diameter well and backfilled with sand

Oak Ridge National Laboratory

444

Effect of surface conditions on boiling heat transfer of refrigerants in shell-and-tube evaporators  

Science Conference Proceedings (OSTI)

Experimental results are presented for the boiling heat transfer performance of R 22 and R 717 on surfaces with porous metallized coatings. A calculational-theoretical model is given for predicting the heat transfer of refrigerants boiling on a bundle of finned tubes.

Danilova, G.N.; Dyundin, V.A.; Borishanskaya, A.V.; Soloviyov, A.G.; Vol'nykh, Y.A.; Kozyrev, A.A.

1990-01-01T23:59:59.000Z

445

Process and apparatus for sensing defects on a smooth cylindrical surface in tubing  

DOE Patents (OSTI)

The cylindrical interior surface of small diameter metal tubing is optically inspected to determine surface roughness by passing a slightly divergent light beam to illuminate the entire interior surface of the tubing. Impingement of the input light beam components on any rough spots on the interior surface generates forward and backward scattered radiation components. The forward scattered components can be measured by blocking direct and specular radiation components exiting the tubing while allowing the forward scattered radiation to travel past the blocking location. Collecting optics are employed to converge the forward scattered radiation onto a photodetector generating a signal indicative of surface roughness. In the back scattered mode, back scattered radiation exiting the tubing through the entrance opening is reflected 90/sup 0/ by a beam splitter towards collecting optics and a photodetector. Alternatively, back scattered radiation can be transmitted through a fiber optic bundle towards the collecting optics. The input light beam can be supplied through a white light fiber optic bundle mounted coaxial with the first bundle.

Dutton, G.W.

1985-08-05T23:59:59.000Z

446

Fouling of HVAC Fin and Tube Heat Exchangers Jeffrey Siegel and Van P. Carey  

E-Print Network (OSTI)

LBNL-47668 Fouling of HVAC Fin and Tube Heat Exchangers Jeffrey Siegel and Van P. Carey CIEE ENDORSEMENT OF OR AGREEMENT WITH THESE FINDINGS, NOR THAT OF ANY CIEE SPONSOR. #12;FOULING OF HVAC in residential, commercial and industrial HVAC applications. Invariably, indoor and outdoor air contaminants foul

447

Lawrence Livermore National Laboratory's Videos on YouTube  

DOE Data Explorer (OSTI)

LLNL established its current channel on YouTube in June of 2009. While many of the video clips concern the National Ignition Facility and are also available at the LLNL website, other offerings include quick looks at research discoveries such as Element 117 and medical advancements such as the artificial retina.

448

Using You Tube to enhance student class preparation in an introductory Java course  

Science Conference Proceedings (OSTI)

We provided 21 short YouTube videos for an Introduction to Programming in Java course. Students were surveyed on how often they watched the videos and did the readings, and how much these activites contributed to their learning. When professors ... Keywords: java, videos, youtube

Martin C. Carlisle

2010-03-01T23:59:59.000Z

449

Vibration of a tube bundle in two-phase Freon cross-flow  

SciTech Connect

Two-phase cross-flow exists in many shell-and-tube heat exchangers. The U-bend region of nuclear steam generators is a prime example. Testing in two-phase flow simulated by air-water provides useful results inexpensively. However, two-phase flow parameters, in particular surface tension and density ratio, are considerably different in air-water than in steam-water. A reasonable compromise is testing in liquid-vapor Freon, which is much closer to steam-water while much simpler experimentally. This paper presents the first results of a series of tests on the vibration behavior of tube bundles subjected to two-phase Freon cross-flow. A rotated triangular tube bundle of tube-to-diameter ratio of 1.5 was tested over a broad range of void fractions and mass fluxes. Fluidelastic instability, random turbulence excitation, and damping were investigated. Well-defined fluidelastic instabilities were observed in continuous two-phase flow regimes. However, intermittent two-phase flow regimes had a dramatic effect on fluidelastic instability. Generally, random turbulence excitation forces are much lower in Freon than in air-water. Damping is very dependent on void fraction, as expected.

Pettigrew, M.J.; Taylor, C.E. [AECL Research, Chalk River, Ontario (Canada). Chalk River Labs.; Jong, J.H.; Currie, I.G. [Univ. of Toronto, Ontario (Canada). Dept. of Mechanical Engineering

1995-11-01T23:59:59.000Z

450

Early Tube Leak Detection in a HRSG Application Using Acoustic Monitoring Technology  

Science Conference Proceedings (OSTI)

Acoustic monitoring has become an essential part of early tube leak detection for conventional boilers. Acoustic monitoring is intended for steam leak detection in pressurized vessels, including power boilers, recovery boilers, and feedwater heaters. The system performs acoustic monitoring by continuously measuring the internal sounds from the boiler, signaling an alarm when the sound exceeds a preset threshold for a ...

2012-12-12T23:59:59.000Z

451

Evaluating and Avoiding Heat Recovery Steam Generator Tube Damage Caused by Duct Burners  

Science Conference Proceedings (OSTI)

In heat recovery steam generators (HRSGs), supplemental firing in duct burners introduces the potential for serious HRSG tube failure and damage. Duct burners that are specified, designed, and operated properly can produce a number of significant benefits. This report will assist operators in accruing these benefits.

2007-03-20T23:59:59.000Z

452

Space-charge perturbation effects in photonic tubes under high irradiation  

SciTech Connect

Potential perturbation effects at the cathode region of a photonic tube can occur at high intensity due to space-charge. Using appropriate photoelectron energy distribution functions, the electric field at the cathode is calculated and its effect upon the spatial/temporal resolution is examined.

Kalibjian, R.; Peterson, G.G.

1982-06-01T23:59:59.000Z

453

The U-tube: A new paradigm in borehole fluid sampling  

Science Conference Proceedings (OSTI)

Fluid samples from deep boreholes can provide insights into subsurface physical, chemical, and biological conditions. Recovery of intact, minimally altered aliquots of subsurface fluids is required for analysis of aqueous chemistry, isotopic composition, and dissolved gases, and for microbial community characterization. Unfortunately, for many reasons, collecting geofluids poses a number of challenges, from formation contamination by drilling to maintaining integrity during recovery from depths. Not only are there substantial engineering issues in retrieval of a representative sample, but there is often the practical reality that fluid sampling is just one of many activities planned for deep boreholes. The U-tube geochemical sampling system presents a new paradigm for deep borehole fluid sampling. Because the system is small, its ability to integrate with other measurement systems and technologies opens up numerous possibilities for multifunctional integrated wellbore completions. To date, the U-tube has been successfully deployed at four different field sites, each with a different deployment modality, at depths from 260 m to 2 km. While the U-tube has proven to be highly versatile, these installations have resulted in data that provide additional insights for improving future U-tube deployments.

Freifeld, B. M.

2009-10-01T23:59:59.000Z

454

Y-12 National Security Complex (NSC): Videos on Y12's NSC YouTube Channel  

DOE Data Explorer (OSTI)

The number of videos on the Y-12 YouTube channel is small. Ten minute clips of historical footage are interesting; those looking for more videos like this are advised to visit the multimedia gallery of the Y-12 website for a larger selection. Go to http://www.y12.doe.gov/library/videos.

455

Supercritical Boiler Tube Wall Temperature Test Base on the Power Plant Control System Database  

Science Conference Proceedings (OSTI)

In order to precisely learn the working condition of 600MW supercritical boiler, new temperature measuring points are set on the super-heater tube wall inner the flue. Since the working condition of 600MW supercritical boiler is quite severe, the temperature ... Keywords: supercritical boiler, database, temperature test, super-heater

Yu Yanzhi; Zhang Liangbo; Xu Haichuan; Chen Duogang; Dong Gongjun; Shen Bo; Liu Sheng

2010-06-01T23:59:59.000Z

456

Atmospheric Radiation Measurement Videos from the ARM Channel on YouTube  

DOE Data Explorer (OSTI)

The ARM Climate Research Facility now has its own channel on YouTube, having joined in late June of 2010. Twenty-six video clips are now available to provide quick views of the work of this DOE scientific user facility for the study of global climate change.

457

Error Analysis of Heat Transfer for Finned-Tube Heat-Exchanger Text-Board  

E-Print Network (OSTI)

In order to reduce the measurement error of heat transfer in water and air side for finned-tube heat-exchanger as little as possible, and design a heat-exchanger test-board measurement system economically, based on the principle of test-board system error analyses and design, the equation of measurement error of heat transfer in air side and water side about orifice meter for the finned-tube heat-exchanger was obtained. This paper studies the major factors that may influence the largest admitted measurement error of measurement instruments for heat transfer in water and air side, and analyzes the degree that water temperature and pressure measurement influence heat transfer in water side, and the degree that wet bulb temperature difference measurement influences heat transfer in air side. Finally, this paper indicates that the key problem of reducing heat transfer in water side is water temperature measurement of the in-out pipe of heat-exchanger, and wet bulb temperature difference is a key to decrease the heat transfer in air side for finned-tube heat-exchanger. This paper gives a theoretical instruction for designing the measurement system of a finned-tube heat-exchanger test-board

Chen, Y.; Zhang, J.

2006-01-01T23:59:59.000Z

458

Multi-Dimensional Adaptive Simulation of Shock-Induced Detonation in a Shock Tube  

E-Print Network (OSTI)

Multi-Dimensional Adaptive Simulation of Shock-Induced Detonation in a Shock Tube P. Ravindran applications, primarily in propulsion.1 Detonations use a reacting flow mechanism wherein a strong shock wave of intense chemical re- actions. The leading shock causes a compression of the combustible mixture, which

Texas at Arlington, University of

459

A Simplified Lumped Parameter Model for U-Tube Steam Generator  

Science Conference Proceedings (OSTI)

A simplified lumped parameter model for U-tube steam generator (UTSG) is presented, according to its working principle and the mass and energy conservation theory as well as the principle of thermal system dynamics. A three-element controller of water ... Keywords: Steam generator, Lumped parameter, Dynamic, Simplified

Zhang Yongsheng; Ma Yunyi

2010-06-01T23:59:59.000Z

460

Study of various photomultiplier tubes with muon beams and Cerenkov light produced in electron showers  

E-Print Network (OSTI)

Study of various photomultiplier tubes with muon beams and Cerenkov light produced in electron beams and Cerenkov light produced in electron showers CMS HCAL collaboration E-mail: Burak their windows were traversed by energetic charged particles. This signal, which is due to Cerenkov light

Akgun, Ugur

Note: This page contains sample records for the topic "tubing suction tubing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Multimedia from the Northwest National Marine Renewable Energy Center (NNMREC) on YouTube  

DOE Data Explorer (OSTI)

The Northwest National Marine Renewable Energy Center (NNMREC) is a DOE-funded partnership between Oregon State University and the University of Washington. Oregon State focuses on wave energy research and development, while the University of Washington focuses on tidal energy. The NNMREC YouTube channel makes more than sixty short video clips available.

462

Videos from the Office of Nuclear Energy Channel on YouTube  

DOE Data Explorer (OSTI)

The Office of Nuclear Energy (NE) promotes nuclear power as a resource capable of meeting the Nation's energy, environmental, and national security needs by resolving technical and regulatory barriers through research, development, and demonstration. NE joined many others from DOE on YouTube in September, 2009.

463

Small-sized flat-tip CNT emitters for miniaturized x-ray tubes  

Science Conference Proceedings (OSTI)

Small tip-type CNT emitters with the diameter of 0.8 mm were fabricated for miniaturized X-ray tubes. The CNT emitters were prepared by dropping CNTs and silver nanoparticles on a flat surface of a W metal tip followed by annealing at 800C for ...

Hyun Jin Kim, Jun Mok Ha, Sung Hwan Heo, Sung Oh Cho

2012-01-01T23:59:59.000Z

464

Detectando usurios maliciosos em interaes via vdeos no YouTube  

Science Conference Proceedings (OSTI)

Various services on the Web 2.0 offer functions that allow users to post videos as response to a discussion topic. As an example, YouTube allows users to post video responses to an opening video topic. Such a video response can be a polluted video, aiming ... Keywords: social network, video promotion, video response, video spam

Fabrcio Benevenuto; Tiago Rodrigues; Virglio Almeida; Jussara Almeida; Marcos Gonalves

2008-10-01T23:59:59.000Z

465

Scientific and Historical Videos on YouTube from DOE/NNSA Nevada Site Office  

DOE Data Explorer (OSTI)

In July of 2009, NNSA Nevada began posting videos on YouTube. There are currently 120 videos, most concerning weapons testing and historical operations. They are freely available to the public for viewing and can be interactively shared or commented on.

466

EHC Tubing/Fittings and Air Piping Applications and Maintenance Guide  

Science Conference Proceedings (OSTI)

The tubing and fittings of electrohydraulic controls (EHC) and the air piping in steam turbines have been a cause of plant trips, load reductions, and maintenance problems. This guide provides information and recommendations to improve the reliability of these components in the EHC and compressed air systems.

2000-11-16T23:59:59.000Z

467

An air cooled tube-fin evaporator model for an expansion valve control law  

Science Conference Proceedings (OSTI)

For control purposes, a mathematical model of a tube-fin evaporator of a vapour compression plant running with R22 is analyzed. The refrigerant behavior in an evaporating region is described by a homogeneous model. The balance equations, together with ... Keywords: Control devices, Evaporator models, Heat transfer, Nonlinear differential systems, Numerical methods, Phase transition

C. Aprea; C. Renno

1999-10-01T23:59:59.000Z

468

Monte Carlo Study of the Scattering Error of a Quartz Reflective Absorption Tube  

Science Conference Proceedings (OSTI)

A Monte Carlo model was used to study the scattering error of an absorption meter with a divergent light beam and a limited acceptance angle of the receiver. Reflections at both ends of the tube were taken into account. Calculations of the effect ...

Jacek Piskozub; Piotr J. Flatau; J. V. Ronald Zaneveld

2001-03-01T23:59:59.000Z