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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...

References

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