2014
DOI: 10.1063/1.4902641
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Analytical and experimental studies of leak location and environment characterization for the international space station

Abstract: The International Space Station program is developing a robotically-operated leak locator tool to be used externally. The tool would consist of a Residual Gas Analyzer for partial pressure measurements and a full range pressure gauge for total pressure measurements. The primary application is to detect NH 3 coolant leaks in the ISS thermal control system.An analytical model of leak plume physics is presented that can account for effusive flow as well as plumes produced by sonic orifices and thruster operations… Show more

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Cited by 3 publications
(2 citation statements)
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“…Aboard spacecraft, within spacesuits, and even in confined habitats, such as those planned for future Mars or Earth Moon Missions, 1-3 the monitoring of gasses hazardous to humans, experiments, and equipment is paramount for ensuring safe operations. 1,4,5 Detection of toxic gases is necessary in every part of the mission from prelaunch fueling, where volatile fuels such as toxic hydrazine may partially decompose exothermically at room temperature in the presence of exposed catalytically active metallic surfaces, 6 to routine inspection and status monitoring. Even chemically inert gases such as carbon dioxide (CO 2 ), at concentrations below asphyxiating limits, can pose an indirect risk to humans by reducing cognitive performance.…”
Section: Introductionmentioning
confidence: 99%
“…Aboard spacecraft, within spacesuits, and even in confined habitats, such as those planned for future Mars or Earth Moon Missions, 1-3 the monitoring of gasses hazardous to humans, experiments, and equipment is paramount for ensuring safe operations. 1,4,5 Detection of toxic gases is necessary in every part of the mission from prelaunch fueling, where volatile fuels such as toxic hydrazine may partially decompose exothermically at room temperature in the presence of exposed catalytically active metallic surfaces, 6 to routine inspection and status monitoring. Even chemically inert gases such as carbon dioxide (CO 2 ), at concentrations below asphyxiating limits, can pose an indirect risk to humans by reducing cognitive performance.…”
Section: Introductionmentioning
confidence: 99%
“…2 RELL testing and assembly was completed at GSFC, including leak detection tests in a thermal vacuum chamber. 4 Pressure data collected by the RGA was compared with analytical models for a vent/round jet in a rarefied environment. The mass spectrometer was mounted on a translation/rotation stage and moved relative to fixed leak sources near the chamber wall.…”
Section: Introductionmentioning
confidence: 99%