Demonstration of rapid and sensitive module leak certification for space station freedom

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A leak detection and quantification demonstration using perflurocarbon tracer (PFT) technology was successfully performed at the NASA Marshall Space Flight Center on January 25, 1991. The real-time Dual Trap Analyzer (DTA) at one-half hour after the start of the first run gave an estimated leak rate of 0.7 mL/min. This has since been refined to be 1.15 {plus minus} 0.09 mL/min. The leak rates in the next three runs were determined to be 9.8 {plus minus} 0.7, {minus}0.4 {plus minus} 0.3, and 76 {plus minus} 6 mL/min, respectively. The theory on leak quantification in the steady-state and time-dependent modes for ... continued below

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Pages: (80 p)

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Dietz, R.N. & Goodrich, R.W. (Brookhaven National Lab., Upton, NY (United States)) March 1, 1991.

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Description

A leak detection and quantification demonstration using perflurocarbon tracer (PFT) technology was successfully performed at the NASA Marshall Space Flight Center on January 25, 1991. The real-time Dual Trap Analyzer (DTA) at one-half hour after the start of the first run gave an estimated leak rate of 0.7 mL/min. This has since been refined to be 1.15 {plus minus} 0.09 mL/min. The leak rates in the next three runs were determined to be 9.8 {plus minus} 0.7, {minus}0.4 {plus minus} 0.3, and 76 {plus minus} 6 mL/min, respectively. The theory on leak quantification in the steady-state and time-dependent modes for a single zone test facility was developed and applied to the above determinations. The laboratory PFT analysis system gave a limit-of-detection (LOD) of 0.05 fL for ocPDCH. This is the tracer of choice and is about 100-fold better than that for the DTA. Applied to leak certification, the LOD is about 0.00002 mL/s (0.000075 L/h), a 5 order-of-magnitude improvement over the original leak certification specification. Furthermore, this limit can be attained in a measurement period of 3 to 4 hours instead of days, weeks, or months. A new Leak Certification Facility is also proposed to provide for zonal (three zones) determination of leak rates. The appropriate multizone equations, their solutions, and error analysis have already been derived. A new concept of seal-integrity certification has been demonstrated for a variety of controlled leaks in the range of module leak testing. High structural integrity leaks were shown to have a linear dependence of flow on {Delta}p. The rapid determination of leak rates at different pressures is proposed and is to be determined while subjecting the module to other external force-generating parameters such as vibration, torque, solar intensity, etc. 13 refs.

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Pages: (80 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE92014168
  • Report No.: BNL-47242
  • Grant Number: AC02-76CH00016
  • DOI: 10.2172/5231609 | External Link
  • Office of Scientific & Technical Information Report Number: 5231609
  • Archival Resource Key: ark:/67531/metadc1065625

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Office of Scientific & Technical Information Technical Reports

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  • March 1, 1991

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 2, 2018, 5:56 p.m.

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Dietz, R.N. & Goodrich, R.W. (Brookhaven National Lab., Upton, NY (United States)). Demonstration of rapid and sensitive module leak certification for space station freedom, report, March 1, 1991; United States. (digital.library.unt.edu/ark:/67531/metadc1065625/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.