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Development of CFC-Free Cleaning Processes at the NASA White Sands Test FacilityThe NASA White Sands Test Facility (WSTF) is developing cleaning and verification processes to replace currently used chlorofluorocarbon-113- (CFC-113-) based processes. The processes being evaluated include both aqueous- and solvent-based techniques. The presentation will include the findings of investigations of aqueous cleaning and verification processes that are based on a draft of a proposed NASA Kennedy Space Center (KSC) cleaning procedure. Verification testing with known contaminants, such as hydraulic fluid and commonly used oils, established correlations between nonvolatile residue and CFC-113. Recoveries ranged from 35 to 60 percent of theoretical. WSTF is also investigating enhancements to aqueous sampling for organics and particulates. Although aqueous alternatives have been identified for several processes, a need still exists for nonaqueous solvent cleaning, such as the cleaning and cleanliness verification of gauges used for oxygen service. The cleaning effectiveness of tetrachloroethylene (PCE), trichloroethylene (TCE), ethanol, hydrochlorofluorocarbon-225 (HCFC-225), tert-butylmethylether, and n-Hexane was evaluated using aerospace gauges and precision instruments and then compared to the cleaning effectiveness of CFC-113. Solvents considered for use in oxygen systems were also tested for oxygen compatibility using high-pressure oxygen autoignition and liquid oxygen mechanical impact testing.
Document ID
19970020241
Document Type
Conference Paper
Authors
Beeson, Harold
(NASA White Sands Test Facility NM United States)
Kirsch, Mike
(NASA White Sands Test Facility NM United States)
Hornung, Steven
(Allied-Signal Technical Services Corp. Las Cruces, NM United States)
Biesinger, Paul
(Allied-Signal Technical Services Corp. Las Cruces, NM United States)
Date Acquired
August 17, 2013
Publication Date
July 1, 1995
Publication Information
Publication: Environmentally Sound Processing Technology: JANNAF Safety and Environmental Protection Subcommittee and Propellant Development and Characterization Subcommittee Joint Workshop
Subject Category
Environment Pollution
Accession Number
97N21685
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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