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Compensating For Shrinkage In A Cryogenic SealProposed design for seals in liquid-hydrogen plumbing eliminates leaks caused by contraction of seals at low operating temperature. Each seal consists of rubber, polytetrafluorethylene, or lead O-ring including hollow core filled with water. At temperature of liquid hydrogen, anomalous expansion of water keeps seal gland filled and leaktight despite shrinkage of surrounding O-ring material. Design also used in systems using cryogenic fluids other than liquid hydrogen.
Document ID
19930000406
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Hill, Arnold E. (Lockheed Space Operations Co.)
Date Acquired
August 16, 2013
Publication Date
July 1, 1993
Publication Information
Publication: NASA Tech Briefs
Volume: 17
Issue: 7
ISSN: 0145-319X
Subject Category
Mechanics
Report/Patent Number
KSC-11555
Accession Number
93B10406
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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