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Title: Shaft Seal Systems of Rotary Equipment in Cryogenic Plants

Authors:
;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1330444
Report Number(s):
SLAC-PUB-16847
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Contributed to Cryogenic Operations Workshop, 25 - 27 Oct 2016, Fermilab, Batavia, IL, USA
Country of Publication:
United States
Language:
English
Subject:
Other,ENG

Citation Formats

Pflueckhahn, Dirk, and /SLAC. Shaft Seal Systems of Rotary Equipment in Cryogenic Plants. United States: N. p., 2017. Web.
Pflueckhahn, Dirk, & /SLAC. Shaft Seal Systems of Rotary Equipment in Cryogenic Plants. United States.
Pflueckhahn, Dirk, and /SLAC. Mon . "Shaft Seal Systems of Rotary Equipment in Cryogenic Plants". United States. doi:. https://www.osti.gov/servlets/purl/1330444.
@article{osti_1330444,
title = {Shaft Seal Systems of Rotary Equipment in Cryogenic Plants},
author = {Pflueckhahn, Dirk and /SLAC},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 06 00:00:00 EST 2017},
month = {Mon Mar 06 00:00:00 EST 2017}
}

Conference:
Other availability
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  • The direct-cycle High-Temperature Gas-Cooled Reactor (HTGR) employs a closed gas-turbine cycle with the primary reactor coolant (helium) as the working fluid. Design studies on this type of plant, carried out since 1971, have demonstrated, among other points, the advantages of the integrated arrangement, in which power from the cycle is transmitted to the electric generators by turbomachines completely enclosed in the reactor pressure vessel. A result of this arrangement is that the bearings are entirely enclosed within the primary coolant system of the reactor. An important aspect of the design of the turbomachinery is its prevention or minimization of themore » ingress of lubricants into the primary coolant system and its prevention of ingress of primary coolant into the bearing compartments. The design studies, which included thorough conceptual designs of the turbomachinery with emphasis on bearings and seals and their support systems showed that total exclusion of lubricant requires extremely complex seals and seal support systems. The variation of system low-end pressure with control actuation and the requirement that the bearing cavity pressure follow these variations were proved to further complicate the service system. The tolerance of even relatively minute amounts of entering lubricant during control transients will allow considerable simplification. This paper discusses the above-mentioned problems and their solutions in tracing the design evolution of a satisfactory bearing-compartment seals and service system. The resulting system appears to be feasible on the basis of experience with industrial gas turbines.« less
  • For either case for rotary shaft or reciprocating shaft motion, rubber lip type seal problems are often encountered under low temperature conditions. As for causes of leakage under low temperature conditions, there are several factors such as following ability of the sealing lip for runout of a shaft or rod, roughening of the sealing surface of the rubber material at the stage of initial motion and so on. Sealing performance is essentially dependent upon the low temperature property of the rubber materials. In this paper, the leakage phenomena is explained through visco-elastic characteristics of the rubber materials.
  • A hydrodynamically lubricated squeeze packing type rotary shaft seal suitable for lubricant retention and environmental exclusion which incorporates one or more resilient protuberances which cooperate with the gland walls to hold the seal straight in its installation groove in unpressurized and low pressure lubricant retention applications thereby preventing skew-induced wear caused by impingement of abrasive contaminants present in the environment, and which also serve as radial bearings to prevent tipping of the seal within its installation gland. 14 figs.
  • The invention is a novel rotary shaft seal assembly which provides positive-contact sealing when the shaft is not rotated and which operates with its sealing surfaces separated by a film of compressed ambient gas whose width is independent of the speed of shaft rotation. In a preferred embodiment, the assembly includes a disc affixed to the shaft for rotation therewith. Axially movable, non-rotatable plates respectively supported by sealing bellows are positioned on either side of the disc to be in sealing engagement therewith. Each plate carries piezoelectric transducer elements which are electrically energized at startup to produce films of compressedmore » ambient gas between the confronting surfaces of the plates and the disc. Following shutdown of the shaft, the transducer elements are de-energized. A control circuit responds to incipient rubbing between the plate and either disc by altering the electrical input to the transducer elements to eliminate rubbing.« less
  • A hydrodynamically lubricated squeeze packing type rotary shaft seal suitable for lubricant retention and environmental exclusion which incorporates one or more resilient protuberances which and cooperate with the gland walls to hold the seal straight in its installation groove in unpressurized and low pressure lubricant retention applications thereby preventing skew-induced wear caused by impingement of abrasive contaminants present in the environment, and which also serve as radial bearings to prevent tipping of the seal within its installation gland.