NASA-LLIS-0851
Lessons Learned – GHe Purging of Hydrogen Systems
active, Most Current
| Organization: | NASA |
| Publication Date: | 1 April 2000 |
| Status: | active |
| Page Count: | 3 |
scope:
Practice:
Prior to venting a hydrogen (H2) system, initiate a gaseous helium (GHe) sweep purge to evacuate air from the vent line. After venting operations are complete, initiate a second GHe sweep purge to evacuate the vent system of residual H2. Use a flapper valve or check valve on the vent line to prevent air intrusion into the line during low or intermittent flow conditions.
Document History
NASA-LLIS-0851
April 1, 2000
Lessons Learned – GHe Purging of Hydrogen Systems
Practice:
Prior to venting a hydrogen (H2) system, initiate a gaseous helium (GHe) sweep purge to evacuate air from the vent line. After venting operations are complete, initiate a second GHe sweep...