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Evaluation of alternatives for trichlorotrifluoroethane (CFC-113) to clean and verify liquid oxygen systemsNASA Langley Research Center (LARC) investigated several alternatives to the use of tri-chloro-tri-fluoroethane(CFC-113) in oxygen cleaning and verification. Alternatives investigated include several replacement solvents, Non-Destructive Evaluation (NDE) and Total Organic Carbon (TOC) analysis. Among the solvents, 1, 1-dichloro-1-fluoroethane (HCFC 141b) and di-chloro-penta-fluoro-propane (HCFC 225) are the most suitable alternatives for cleaning and verification. However, use of HCFC 141b is restricted, HCFC 225 introduces toxicity hazards, and the NDE and TOC methods of verification are not suitable for processes at LaRC. Therefore, the interim recommendation is to sparingly use CFC-113 for the very difficult cleaning tasks where safety is critical and to use HCFC 225 to clean components in a controlled laboratory environment. Meanwhile, evaluation must continue on now solvents and procedures to find one suited to LaRCs oxygen cleaning needs.
Document ID
19960050103
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Morris, Michelle L. (NASA Langley Research Center Hampton,VA United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1996
Subject Category
Chemistry And Materials (General)
Report/Patent Number
NASA-TM-110275
NAS 1.15:110275
Accession Number
96N34210
Funding Number(s)
PROJECT: RTOP 505-90-82-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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