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NASA-LLIS-0056
Lessons Learned - Inadvertent Quick Disconnect (Q.D.) Nipple Separation
Year: 1992
Abstract: Description of Driving Event:
During hydrazine servicing of the left hand SRB tilt system, the fill/drain quick disconnect (Q.D.) nipple separated during cap removal, allowing the entire 3 1/2 gallon load to drain onto the MLP deck. The Q.D. nipple separation occurred because of nipple to cap thread seizure, caused by pressure build-up between the Q.D. and cap. Current design allows the possibility of Q.D. nipple removal while trying to remove Q.D. cap. The technician had no visual clue that the nipple was turning because of the scupper installation. The technician was drenched with hydrazine during the incident.
During hydrazine servicing of the left hand SRB tilt system, the fill/drain quick disconnect (Q.D.) nipple separated during cap removal, allowing the entire 3 1/2 gallon load to drain onto the MLP deck. The Q.D. nipple separation occurred because of nipple to cap thread seizure, caused by pressure build-up between the Q.D. and cap. Current design allows the possibility of Q.D. nipple removal while trying to remove Q.D. cap. The technician had no visual clue that the nipple was turning because of the scupper installation. The technician was drenched with hydrazine during the incident.
Subject: Energetic Materials - Explosive/Propellant/Pyrotechnic
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T16:03:03Z | |
| date available | 2017-09-04T16:03:03Z | |
| date copyright | 01/27/1992 | |
| date issued | 1992 | |
| identifier other | BGYCQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/66257 | |
| description abstract | Description of Driving Event: During hydrazine servicing of the left hand SRB tilt system, the fill/drain quick disconnect (Q.D.) nipple separated during cap removal, allowing the entire 3 1/2 gallon load to drain onto the MLP deck. The Q.D. nipple separation occurred because of nipple to cap thread seizure, caused by pressure build-up between the Q.D. and cap. Current design allows the possibility of Q.D. nipple removal while trying to remove Q.D. cap. The technician had no visual clue that the nipple was turning because of the scupper installation. The technician was drenched with hydrazine during the incident. | |
| language | English | |
| title | NASA-LLIS-0056 | num |
| title | Lessons Learned - Inadvertent Quick Disconnect (Q.D.) Nipple Separation | 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 | Flight Equipment | |
| subject keywords | Ground Equipment | |
| subject keywords | Ground Operations | |
| subject keywords | Launch Process | |
| subject keywords | Launch Vehicle | |
| subject keywords | Packaging Handling Storage | |
| subject keywords | Parts Materials & Processes |