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Lightweight thermally efficient composite feedlines, preliminary design and evaluationSix liquid hydrogen feedline design concepts were developed for the cryogenic space tug. The feedlines include composite and all-metal vacuum jacketed and non-vacuum jacketed concepts, and incorporate the latest technology developments in the areas of thermally efficient vacuum jacket end closures and standoffs, radiation shields in the vacuum annulus, thermal coatings, and lightweight dissimilar metal flanged joints. The feedline design concepts were evaluated on the basis of thermal performance, weight, cost, reliability, and reusability. It is shown that composite tubing provides improved thermal performance and reduced weight for each design concept considered. Approximately 12 kg (26 lb.) can be saved by the use of composite tubing for the LH2 feedline and the other propulsion lines in the space tug.
Document ID
19740019256
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Spond, D. E. (Martin Marietta Corp. Denver, CO, United States)
Holzworth, R. E. (Martin Marietta Corp. Denver, CO, United States)
Hall, C. A. (Martin Marietta Corp. Denver, CO, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1974
Subject Category
Space Vehicles
Report/Patent Number
NASA-CR-134631
Accession Number
74N27369
Funding Number(s)
CONTRACT_GRANT: NAS3-17796
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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