NASA-LLIS-0420
Lessons Learned – VO'75 Pressure Regulator Leakage and Work-Around Procedures (~1976)
active, Most Current
| Organization: | NASA |
| Publication Date: | 8 July 1996 |
| Status: | active |
| Page Count: | 3 |
scope:
Abstract:
The pressure regulator in the Viking Orbiter Propulsion Subsystem started leaking following a pyro firing that occurred prior to the near-Mars TCM. Likely causes were corrosion or residue from propellant migration or pyro valve blowby, or particulate contamination. Recommendations included using separate regulators for the fuel and oxidizer sides, incorporating a bellows in the pyro valve to eliminate blowby, and adding a isolation valve between the regulator and propellant tank.
Document History
NASA-LLIS-0420
July 8, 1996
Lessons Learned – VO'75 Pressure Regulator Leakage and Work-Around Procedures (~1976)
Abstract:
The pressure regulator in the Viking Orbiter Propulsion Subsystem started leaking following a pyro firing that occurred prior to the near-Mars TCM. Likely causes were corrosion or residue...
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