The US Department of Energy (DOE) is sponsoring compressed natural gas (CNG) powered school bus demonstration in various locations around the country. Early in 1994, two non-DOE-sponsored CNG pick-up trucks equipped with composite reinforced aluminum fuel cylinders experienced cylinder ruptures during refueling. As reported by the Gas Research Institute (GRI):...analysis of the cylinder ruptures on the pickup trucks revealed that they were due to acid induced stress corrosion cracking (SCC) of the overwrap. The overwrap that GRI refers to is a resin-impregnated fiber that is wrapped around the outside of the gas cylinder for added strength. Because ensuring the safety of CNG vehicles it sponsors is of paramount concern to DOE, the Department, through the National Renewable Energy Laboratory (NREL), conducted inspections of DOE-sponsored vehicles nationwide. The work had three objectives: inspection, documentation, and education. First, inspectors visited sites where CNG-powered school buses sponsored by DOE are based, and inspected the CNG cylinders for damage. Second, information learned during the inspections was collected for DOE. Third, the inspections found that the education and awareness of site personnel, in terms of cylinder damage detection, needed to be increased.

  • Supplemental Notes:
    • Sponsored by Department of Energy, Washington, DC.
  • Corporate Authors:

    National Renewable Energy Laboratory

    1617 Cole Boulevard
    Golden, CO  United States  80401
  • Publication Date: 1995-7


  • English

Media Info

  • Pagination: 41 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00720987
  • Record Type: Publication
  • Report/Paper Numbers: NREL-TP-425-7629
  • Files: TRIS
  • Created Date: May 23 1996 12:00AM