STP1181

    Methods for Using Water Impingement in Lieu of Chlorofluorocarbon 113 for Determining the Non-Volatile Residue Level on Precision Cleaned Hardware

    Published: Jan 1993


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    Abstract

    Chlorofluorocarbon (CFC) 113 is currently in use at the John F. Kennedy Space Center as a cleaning verification solvent. A CFC 113 rinse is routinely used to verify that valves and other large components meet a non-volatile residue (NVR) requirement of less than 1 mg per 0.09 m2 (1 ft2) of surface area. The National Aeronautics and Space Administration plans to eliminate the use of CFC 113 for NVR analysis by 1995. Data is presented from a test program in progress to develop water impingement NVR processes. Contaminant removal tests were conducted on stainless steel test plates using three water impingement methods, liquid, steam, and gas/liquid. The use of total organic carbon analysis to determine the NVR cleanliness level is also discussed.

    Keywords:

    precision cleaning verification, non-volatile residue, CFC 113, water impingement, total organic carbon analysis


    Author Information:

    Dearing, WL
    Aerospace Technology Materials Engineer, Materials Science Laboratory, John F. Kennedy Space Center, FL

    Bales, LD
    Aerospace Technology Materials Engineer, Materials Science Laboratory, John F. Kennedy Space Center, FL

    Bassett, CW
    Aerospace Technology Materials Engineer, Materials Science Laboratory, John F. Kennedy Space Center, FL

    Caimi, RE
    Aerospace Technology Experimental Facilities Development Engineer, John F. Kennedy Space Center, FL

    Lafferty, GM
    Engineering Trainee, Materials Science Laboratory, John F. Kennedy Space Center, FL

    Melton, GS
    Aerospace Technology Materials Engineer, Materials Science Laboratory, John F. Kennedy Space Center, FL

    Sorrell, DL
    Engineering Trainee, Materials Science Laboratory, John F. Kennedy Space Center, FL

    Thaxton, EA
    Aerospace Technology Gas and Fluid Systems Engineer, John F. Kennedy Space Center, FL


    Paper ID: STP15953S

    Committee/Subcommittee: G04.01

    DOI: 10.1520/STP15953S


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