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Electrical enclosure hydrogen intrusion study

Author
Welch, P. J.
Published
Jun 1, 1979.
Physical Description
1 electronic document
Additional Creators
Yantsios, J. N.
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
As a cost savings measure for the space shuttle program, the feasibility of substituting dry air for nitrogen as the purge gas used to minimize the probability of fire and explosions which could erupt from propellant vapor (hydrogen) diffusion into the electrical enclosures at Launch Complex 39 was investigated. It was concluded that: (1) Hydrogen concentrations of approximately 1% were obtained in an electrical enclosure under design purge conditions. (2) Hydrogen concentrations exceeding the lower explosive limit, 4%, could probably be obtained within the enclosure under worst case conditions. (3) Most of the hydrogen intrusion into the enclosure probably occurred at the point with the shortest leak path, such as the door seal. (4) More stringent electrical enclosure design requirements should be imposed before air is using as a purge gas.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19790017690.
Accession ID: 79N25861.
NASA-TP-1461.
KSC-TR-72-1.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15725270