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NASA-LLIS-0026
Lessons Learned - Critical Gaseous Helium (GHE) Purge Operations
Year: 1992
Abstract: 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.
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.
Subject: Energetic Materials - Explosive/Propellant/Pyrotechnic
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NASA-LLIS-0026
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:05:40Z | |
| date available | 2017-09-04T17:05:40Z | |
| date copyright | 09/04/1992 | |
| date issued | 1992 | |
| identifier other | YCYCQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/129200 | |
| description abstract | 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. | |
| language | English | |
| title | NASA-LLIS-0026 | num |
| title | Lessons Learned - Critical Gaseous Helium (GHE) Purge Operations | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1992 | |
| contenttype | fulltext | |
| subject keywords | Energetic Materials - Explosive/Propellant/Pyrotechnic | |
| subject keywords | Facilities | |
| subject keywords | Ground Equipment | |
| subject keywords | Ground Operations | |
| subject keywords | Hardware | |
| subject keywords | Pressure Vessels |