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 (9 cycles at 4.2 K), and superfluid helium temperature (4 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(-9) std-cc/sec, during testing.
Document ID
19890061585
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Salerno, Louis J. (NASA Ames Research Center Moffett Field, CA, United States)
Kittel, Peter (NASA Ames Research Center Moffett Field, CA, United States)
Spivak, Alan L. (Trans-Bay Electronics, Inc. Richmond, CA, United States)