NASA-LLIS-0964
Lessons Learned – Space Shuttle Main Engine (SSME): Dry Gaseous Purges
active, Most Current
| Organization: | NASA |
| Publication Date: | 15 May 1995 |
| Status: | active |
| Page Count: | 2 |
scope:
Description of Driving Event:
Prior to starting the engine, there is a period of time referred to as the start preparation phase. At the beginning of this time period, the oxidizer side of the engine is purged with dry nitrogen to eliminate moisture and the fuel side is purged with dry helium to eliminate air as well as moisture. This prevents the formation of ice particles in the LOX system or air frozen by the hydrogen.
Document History
NASA-LLIS-0964
May 15, 1995
Lessons Learned – Space Shuttle Main Engine (SSME): Dry Gaseous Purges
Description of Driving Event:
Prior to starting the engine, there is a period of time referred to as the start preparation phase. At the beginning of this time period, the oxidizer side of the...
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