NASA-LLIS-0026
Lessons Learned - Critical Gaseous Helium (GHE) Purge Operations
active, Most Current
| Organization: | NASA |
| Publication Date: | 4 September 1992 |
| Status: | active |
| Page Count: | 2 |
scope:
Description of Driving Event:
The launch operations area fuel cell servicing system (FCSS) LH2/GH2 system provides for the loading of LH2/GH2 to the orbiter at pads A and B. The LH2 FCSS low pressure sample panel and the fixed service structure FCSS GN2/GHe service panel are utilized for the helium sweep flow purge to the FCSS hydrogen vent stack. Three critical items are in the GN2/GHE service panel and two are located in the low pressure sample panel. Failure of a critical item will disable the sweep flow purge to the vent stack, which is performed prior to initiating hydrogen steady state venting from the dewar.
Document History
NASA-LLIS-0026
September 4, 1992
Lessons Learned - Critical Gaseous Helium (GHE) Purge Operations
Description of Driving Event:
The launch operations area fuel cell servicing system (FCSS) LH2/GH2 system provides for the loading of LH2/GH2 to the orbiter at pads A and B. The LH2 FCSS low...
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