Insulation of Liquid Oxygen Dewars.
NATIONAL BUREAU OF STANDARDS BOULDER COLO CRYOGENICS DIV
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The Navy has experienced failure of vacuum insulation in dewars used for storage and handling of liquefied breathing oxygen for aircraft pilots. Because of the vacuum insulation failures, a search was made for a more rugged insulation that has thermal performance similar to the currently used vacuum with multilayer or powder. No system was found that compared in thermal performance and did not require a vacuum. Two systems were experimentally evaluated that did not require vacuum. One was polyurethane foam with an intermediate fiber glass shell and the other was glass bubbles in argon gas at one atmosphere pressure. The polyurethane foam system was successful in that no cracks penetrated to the outside surface however, the average thermal conductivity was about 15 times greater than vacuum and powder. Modified author abstract
- Life Support Systems