This program demonstrated the feasibility of producing a lightweight vacuum jacket using state-of-the art techno fogy and materials. Design and analytical studies were made on a full scale, i.e., 4.57 m (15 ft) inside diameter with a volume of 65.1 m3 (2300 ft. 3), OMS fuel (LH2) tank. Preliminary design details were completed for the tank assembly which included an optimized vacuum jacket and MLI system. A half scale LH2 test model was designed and fabricated. A Force/Stiffness (F/S) proof test was conducted on the vacuum jacket. The vacuum jacket designed and fabricated on this program achieved a vacuum leak rate of 1 x 10~5 atmosphere ml of helium per second, sustained approximately 1500 hours of vacuum pressure and experienced 29 vacuum pressure cycles prior to failure.
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