Adiabatic Compression Testing—Part II: Background and Approach to Estimating Severity of Test Methodology

    Volume 6, Issue 8 (September 2009)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 30 July 2009

    Page Count: 18


    Newton, Barry E.
    VP R&D, Wendell Hull and Associates, Inc., Las Cruces, NM

    Chiffoleau, Gwenael J. A.
    Senior Scientist and Test Facility Manager, Wendell Hull and Associates, Inc., Las Cruces, NM

    Steinberg, Ted
    Professor and Director, Queensland Univ. of Technology, Brisbane Queensland,

    Binder, Christian
    Head of Working Group “Safe Handling of Oxygen, Bundesanstalt für Materialforschung und–prüfung, Berlin,

    (Received 17 December 2008; accepted 12 June 2009)

    Abstract

    Adiabatic compression testing of components in gaseous oxygen is a test method that is utilized worldwide and is commonly required to qualify a component for ignition tolerance under its intended service. This testing is required by many industry standards organizations and government agencies; however, a thorough evaluation of the test parameters and test system influences on the thermal energy produced during the test has not yet been performed. This paper presents a background for adiabatic compression testing and discusses an approach to estimating potential differences in the thermal profiles produced by different test laboratories. A “thermal profile test fixture” (TPTF) is described that is capable of measuring and characterizing the thermal energy for a typical pressure shock by any test system. The test systems at Wendell Hull and Associates, Inc., in the United States and at the BAM Federal Institute for Materials Research and Testing in Germany are compared in this manner and some of the data obtained are presented. The paper also introduces a new way of comparing the test method to idealized processes to perform system-by-system comparisons. Thus, the paper introduces an “idealized severity index” (ISI) of the thermal energy to characterize a rapid pressure surge. From the TPTF data a “test severity index” can also be calculated so that the thermal energies developed by different test systems can be compared to each other and to the ISI for the equivalent isentropic process. Finally, a “service severity index” is introduced to characterize the thermal energy of actual service conditions. This paper is the second in a series of publications planned on the subject of adiabatic compression testing.


    Paper ID: JAI102297

    DOI: 10.1520/JAI102297

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    Author
    Title Adiabatic Compression Testing—Part II: Background and Approach to Estimating Severity of Test Methodology
    Symposium Twelfth International Symposium on Flammability and Sensitivity of Materials in Oxygen-Enriched Atmospheres, 2009-10-09
    Committee G04