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Performance of all-metal demountable cryogenic seals at superfluid helium temperaturesTwo all-metal demountable cryogenic seals with an outside diameter of 36.6 mm, inside diameter of 27.2 mm and thickness of 0.51 mm were leak-tested at room temperature (300 K), liquid nitrogen temperature (21 cycles at 77 K), liquid helium temperature (nine cycles at 4.2K) and superfluid helium temperature (four cycles at 1.6 K). Each seal was mounted and demounted for 13 cycles. Thickness measurements at 90 deg intervals along the circumference showed a maximum seal compression of 0.038 mm. Leak rate measurements at all temperatures showed no detectable leak above the helium background level, typically 0.1 x 10 exp -9 std cu cm/s, during testing.
Document ID
19920030601
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Salerno, L. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Kittel, P. L.
(NASA Ames Research Center Moffett Field, CA, United States)
Spivak, A. L.
(Trans-Bay Electronics Richmond, CA, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1991
Publication Information
Publication: Cryogenics
Volume: 31
ISSN: 0011-2275
Subject Category
Mechanical Engineering
Accession Number
92A13225
Distribution Limits
Public
Copyright
Other

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