Fabrication of ultra-sensitive leak detection standards
The primary difficulty with flow rate measurements below 10/sup -10/ standard cubic centimeters per second (std. cc/sec) is that there are no commercially available standards. The requirements, however, dictate that the problem of design and construction of a qualifiable standard in the ultra-sensitive range had to be solved. There are a number of leak types which were considered - capillary leaks, orifice leaks, and the pore type leaks, among others. The capillary leak was not used because of the cracking or sorting effects that are common to this type leak. For example, a gas blend flowing through a capillary leak will result in the lighter gases passing through the leak first. The difficulty of fabricating the proper hole size in relation to the flow rate requirements ruled out the orifice type leak. The choice was the pore type leak which utilizes the basic concept of a stainless steel knife edge driven into a fixed section composed of stainless steel with a gold over-lay and maintained under force.
- Research Organization:
- General Electric Co., St. Petersburg, FL (USA). Neutron Devices Dept.
- DOE Contract Number:
- EY-76-C-04-0656
- OSTI ID:
- 5540457
- Report Number(s):
- GEPP-OP-491; CONF-800519-1; TRN: 80-006764
- Resource Relation:
- Conference: American Vacuum Society New Mexico Chapter meeting, Santa Fe, NM, USA, 6 May 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LEAKS
CALIBRATION STANDARDS
OPERATION
STANDARDS
VALVES
DESIGN
FLOW RATE
FLOWMETERS
GASES
LEAK DETECTORS
POROUS MATERIALS
STAINLESS STEELS
ALLOYS
CHROMIUM ALLOYS
CONTROL EQUIPMENT
CORROSION RESISTANT ALLOYS
EQUIPMENT
FLOW REGULATORS
FLUIDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MEASURING INSTRUMENTS
STEELS
440300* - Miscellaneous Instruments- (-1989)