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NASA-LLIS-2856
Lessons Learned – Re-Certifying An Umbilical After A Modification
Year: 2010
Abstract: Abstract:
The flight element design agency modified the design of the External Tank Ground Umbilical Carrier Plate, which is used to vent hydrogen. The design changes were considered minor enough that modeling and simulation were deemed sufficient to certify the part for use. During STS-114 launch operations, a camera recorded a cryogenic liquid leaking from the shroud used for purging the umbilical. Because oxygen liquefies before nitrogen, the evidence of liquid caused a concern that oxygen was liquefying from air and posing a risk to launch operation safety.
The flight element design agency modified the design of the External Tank Ground Umbilical Carrier Plate, which is used to vent hydrogen. The design changes were considered minor enough that modeling and simulation were deemed sufficient to certify the part for use. During STS-114 launch operations, a camera recorded a cryogenic liquid leaking from the shroud used for purging the umbilical. Because oxygen liquefies before nitrogen, the evidence of liquid caused a concern that oxygen was liquefying from air and posing a risk to launch operation safety.
Subject: Cryogenic Systems
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T18:11:24Z | |
| date available | 2017-09-04T18:11:24Z | |
| date copyright | 06/20/2010 | |
| date issued | 2010 | |
| identifier other | GZPSTCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std;jsery=autho162s7D8308/handle/yse/194368 | |
| description abstract | Abstract: The flight element design agency modified the design of the External Tank Ground Umbilical Carrier Plate, which is used to vent hydrogen. The design changes were considered minor enough that modeling and simulation were deemed sufficient to certify the part for use. During STS-114 launch operations, a camera recorded a cryogenic liquid leaking from the shroud used for purging the umbilical. Because oxygen liquefies before nitrogen, the evidence of liquid caused a concern that oxygen was liquefying from air and posing a risk to launch operation safety. | |
| language | English | |
| title | NASA-LLIS-2856 | num |
| title | Lessons Learned – Re-Certifying An Umbilical After A Modification | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;2010 | |
| contenttype | fulltext | |
| subject keywords | Cryogenic Systems | |
| subject keywords | Engineering design and project processes and standards | |
| subject keywords | Ground support systems | |
| subject keywords | Launch support systems | |
| subject keywords | Launch Systems |