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NASA-LLIS-0066
Lessons Learned - Dewar Vent Plumbing
Year: 1992
Abstract: Description of Driving Event:
A liquid helium dewar used to service payload experiments ruptured and damaged ceiling tiles and a copy machine. In order to service the payload experiments, the dewar converts normal liquid helium to superfluid helium. During this process, air was ingested into the vent line through a valve stem. The ingested air froze, forming a solid blockage. The failure analysis of the liquid helium dewar revealed that 4 of the 8 valves used in the system were not designed for use in vacuum systems.
A liquid helium dewar used to service payload experiments ruptured and damaged ceiling tiles and a copy machine. In order to service the payload experiments, the dewar converts normal liquid helium to superfluid helium. During this process, air was ingested into the vent line through a valve stem. The ingested air froze, forming a solid blockage. The failure analysis of the liquid helium dewar revealed that 4 of the 8 valves used in the system were not designed for use in vacuum systems.
Subject: Cryogenic Systems
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T17:54:42Z | |
| date available | 2017-09-04T17:54:42Z | |
| date copyright | 03/26/1992 | |
| date issued | 1992 | |
| identifier other | FHYCQCAAAAAAAAAA.pdf | |
| identifier uri | http://yse.yabesh.ir/std/handle/yse/177820 | |
| description abstract | Description of Driving Event: A liquid helium dewar used to service payload experiments ruptured and damaged ceiling tiles and a copy machine. In order to service the payload experiments, the dewar converts normal liquid helium to superfluid helium. During this process, air was ingested into the vent line through a valve stem. The ingested air froze, forming a solid blockage. The failure analysis of the liquid helium dewar revealed that 4 of the 8 valves used in the system were not designed for use in vacuum systems. | |
| language | English | |
| title | NASA-LLIS-0066 | num |
| title | Lessons Learned - Dewar Vent Plumbing | en |
| type | standard | |
| page | 2 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;1992 | |
| contenttype | fulltext | |
| subject keywords | Cryogenic Systems | |
| subject keywords | Packaging Handling Storage |