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Report on ISS O2 Production, Gas Supply and Partial Pressure ManagementOxygen is used on International Space Station (ISS) for metabolic support and denitrogenation procedures prior to Extra-Vehicular Activities. Nitrogen is used to maintain total pressure and account for losses associated with leakage and operational losses. Oxygen and nitrogen have been supplied by various visiting vehicles such as the Progress and Shuttle in addition to the on-orbit oxygen production capability. Starting in 2014, new high pressure oxygen/nitrogen tanks are available to launch on commercial cargo vehicles and will replace the high pressure gas source that Shuttle used to provide. To maintain a habitable atmosphere the oxygen and nitrogen partial pressures are controlled between upper and lower bounds. The full range of the allowable partial pressures along with the increased ISS cabin volume are utilized as a buffer allowing days to pass between oxygen production or direct addition of oxygen and nitrogen to the atmosphere from reserves. This paper summarizes the amount of gas supplied and produced from all of the sources and describes past experience of managing partial pressures along with the range of management options available to the ISS.
Document ID
Document Type
Conference Paper
Schaezler, Ryan N. (Boeing Co. Houston, TX, United States)
Cook, Anthony J. (Boeing Co. Houston, TX, United States)
Date Acquired
June 11, 2015
Publication Date
July 12, 2015
Subject Category
Man/System Technology and Life Support
Report/Patent Number
Meeting Information
International Conference on Environmental Systems(Bellevue, WA)
Funding Number(s)
Distribution Limits
Public Use Permitted.

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