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8. Package Sealing and Encapsulation

Author

Wong, C. P., Clegg, D. B., Kumar, Ananda H., Otsuka, K., Ozmat, Berhan, Tummala, Rao R., editor, Rymaszewski, Eugene J., editor, and Klopfenstein, Alan G., editor

Published
1997
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22. Adsorbents in Liquid Oxygen Containers

Author

J. T. Beher

Subjects
Leak, Outgassing, Materials science, Adsorption, Adverse conditions, Nuclear engineering, Ultra-high vacuum, System pressure, Liquid oxygen, Leak rate
Abstract

The liquid oxygen converter has become an important component in modern military aircraft. As a result high vacuum containers for liquid oxygen must be made which meet increasing demands of reliability under increasingly adverse conditions. The success of the containers depends upon maintaining a high static vacuum for as long a period as possible. A vacuum above 5.5 × 10-5 mm Hg is considered too high to produce a satisfactory container. The containers are normally evacuated to below 1 × 10-6 mm Hg system pressure before being sealed off. A leak rate of 1 × 10-10 cc/sec., which is near the practical limit of production leak checking, would require only about one month to raise the pressure to the high limit if no gas entering the container was occluded by any means. If outgassing from materials of construction was also present, the lifetime could be greatly reduced. Laboratory tests have given evidence of outgassing in quantities large enough to raise the pressure well above 5. 5 x 10–5 mm Hg. Airborne containers must survive a vibration test which has been found to release gases in the vacuum space.

Published
1960
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