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NASA NASA-LLIS-0964: Lessons Learned – Space Shuttle Main Engine (SSME): Dry Gaseous Purges

Publication Date: May 15, 1995
SDO: NASA: NASA - National Aeronautics and Space Administration
 DOD Adopted   ANSI Approved Approved

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.

Configuration Management
Cryogenic Systems
Ground Equipment
Hardware
Launch Vehicle
Parts Materials & Processes
Safety & Mission Assurance
Spacecraft
Test Article
Test Facility

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