INSPECTION OF COMPRESSED NATURAL GAS CYLINDERS ON SCHOOL BUSES
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.
- Sponsored by Department of Energy, Washington, DC.
National Renewable Energy Laboratory1617 Cole Boulevard
Golden, CO United States 80401
- Publication Date: 1995-7
- Pagination: 41 p.
- TRT Terms: Alternate fuels; Compressed natural gas; Inspection; Modulus of rupture; School buses; Stress corrosion; Stress cracking; Stresses
- Uncontrolled Terms: Cylinders
- Old TRIS Terms: Corrosion cracking; Ruptures
- Subject Areas: Highways; Vehicles and Equipment; I91: Vehicle Design and Safety;
- Accession Number: 00720987
- Record Type: Publication
- Report/Paper Numbers: NREL-TP-425-7629
- Files: TRIS
- Created Date: May 23 1996 12:00AM