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Emergency relief venting of the infrared telescope liquid helium dewarAn analysis is made of the emergency relief venting of the liquid helium dewar of the Spacelab 2 infrared telescope experiment in the event of a massive failure of the dewar guard vacuum. Such a failure, resulting from a major accident, could cause rapid heating and pressurization of the liquid helium in the dewar and lead to relief venting through the emergency relief system. The heat input from an accident is estimated for various fluid conditions in the dewar and the relief process as it takes place through one or both of the emergency relief paths is considered. It is shown that under all reasonable circumstances the dewar will safely relieve itself, and the pressure will not exceed 85 percent of the proof pressure or 63 percent of the burst pressure.
Document ID
19800013238
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Urban, E. W. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 4, 2013
Publication Date
March 1, 1980
Subject Category
Instrumentation And Photography
Report/Patent Number
NASA-TM-78271
Accession Number
80N21724
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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