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Valve Integrated Pressure Regulator Examination (DOT DUNS #079807449)
  • Published Date:
    2017-03-21
  • Language:
    English
Filetype[PDF-10.05 MB]


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Valve Integrated Pressure Regulator Examination (DOT DUNS #079807449)
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  • Abstract:
    WHA International Inc., (WHA) was requested by the Pipeline and Hazardous Materials Safety Administration (PHMSA) to document and evaluate the valve portion of a ruptured DOT 3AL cylinder that had been involved in a fire during high-pressure oxygen service, and to determine the following: Materials of construction of the valve, including polymeric/elastomeric components; The degree of exposure of the valve to thermal energy; Evidence of a fire on the valve body that may have resulted from the combustion of organic components/contamination in a pure oxygen atmosphere. This report does not include evaluation of fire patterns on the incident cylinder. Analysis of only the Valve Integrated Pressure Regulator (VIPR) was authorized. In August 2016, the incident cylinder was transferred to WHA in preparation for further joint examination of this evidence; however, authorization for detailed examination and testing of the cylinder was not received by WHA; and, by early 2017 WHA was requested to finalize this report (pertaining to the VIPR inspection only) while disposition of the cylinder was still under consideration. As requested by PHMSA, the WHA activities included a forensic analysis of the valve components, utilizing, as needed, Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) with Energy Dispersive Spectroscopy (EDS), to determine if the use of inappropriate materials on the valve may have resulted in combustion inside the pressurized oxygen service DOT 3AL cylinder. The WHA investigation included inspection and documentation of the fire-damaged VIPR and included a joint inspection of the evidence at the WHA Laboratory in Las Cruces, NM, with interested parties in attendance. The joint inspection included disassembly of the VIPR and selection of samples for chemical and elemental analysis.
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