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NASA-LLIS-0039
Lessons Learned - SSME Oxygen Lines
Year: 1992
Abstract: Description of Driving Event:
The mass SPEC is used to leak check the SSME heat exchanger (HEX) coil, to evacuate the MPS fuel vacuum jacketed (VJ) lines and for external leak checks using the hand-held probe. The heat exchanger converts liquid oxygen to gaseous oxygen for pressurizing the shuttle external oxygen tank. The MPS fuel line vacuum jackets provide the insulation necessary to meet SSME pre-start pump inlet temperatures. If mass SPEC vacuum is lost for any reason (power loss or belt breakage) vacuum roughing pump oil may be sucked into the SSME heat exchanger (back-streaming) unless the hex is isolated immediately.
The mass SPEC is used to leak check the SSME heat exchanger (HEX) coil, to evacuate the MPS fuel vacuum jacketed (VJ) lines and for external leak checks using the hand-held probe. The heat exchanger converts liquid oxygen to gaseous oxygen for pressurizing the shuttle external oxygen tank. The MPS fuel line vacuum jackets provide the insulation necessary to meet SSME pre-start pump inlet temperatures. If mass SPEC vacuum is lost for any reason (power loss or belt breakage) vacuum roughing pump oil may be sucked into the SSME heat exchanger (back-streaming) unless the hex is isolated immediately.
Subject: Flight Equipment
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:27:48Z | |
| date available | 2017-09-04T17:27:48Z | |
| date copyright | 09/18/1992 | |
| date issued | 1992 | |
| identifier other | CNYCQCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/150944 | |
| description abstract | Description of Driving Event: The mass SPEC is used to leak check the SSME heat exchanger (HEX) coil, to evacuate the MPS fuel vacuum jacketed (VJ) lines and for external leak checks using the hand-held probe. The heat exchanger converts liquid oxygen to gaseous oxygen for pressurizing the shuttle external oxygen tank. The MPS fuel line vacuum jackets provide the insulation necessary to meet SSME pre-start pump inlet temperatures. If mass SPEC vacuum is lost for any reason (power loss or belt breakage) vacuum roughing pump oil may be sucked into the SSME heat exchanger (back-streaming) unless the hex is isolated immediately. | |
| language | English | |
| title | NASA-LLIS-0039 | num |
| title | Lessons Learned - SSME Oxygen Lines | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1992 | |
| contenttype | fulltext | |
| subject keywords | Flight Equipment | |
| subject keywords | Flight Operations | |
| subject keywords | Ground Equipment | |
| subject keywords | Ground Operations | |
| subject keywords | Hardware | |
| subject keywords | Launch Process | |
| subject keywords | Launch Vehicle | |
| subject keywords | Parts Materials & Processes |