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Methods used to investigate and resolve the Space Shuttle helium pressure regulator instabilityThe Space Shuttle main propulsion system (MPS) has seven 750-psia regulators used to purge the Space Shuttle main engines to prevent mixture between oxygen and hydrogen and to pneumatically actuate the propellant valves. Methods used to investigate the instability of the MPS regulators which caused a failure of the 750-psia regulator during a test in 1986 are discussed, with special attention given to the analytical tools and the facilities. As a result of this investigation, a well-understood regulator was designed, with excellent stability over a wide range of inlet pressures from 900 to 4500 psia, flow rates from 1 to 2000 scfm, very fast response, minimal overshoot and undershoot, and durable cycle life. Diagrams of the MPS helium system and of a new -0006 fail-safe improved-stability regulator are presented.
Document ID
19900055169
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hurlbert, Eric A.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Abe, Jimi T.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1990
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
AIAA PAPER 90-2749
Accession Number
90A42224
Distribution Limits
Public
Copyright
Other

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