Precautions while using CNG
Tank Inspection And Expiration
CNG fuel tanks must be US Dept. of Transportation DOT approved. As the structural integrity of CNG tanks degrade over time, all tanks are required to have an expiration label. Do not continue to use expired cylinders! CNG tanks and fuel systems must also be visually inspected after a motor vehicle accident or fire and at least every 36 months or 36,000 miles, whichever comes first, for damage and deterioration per DOT regulation FMVSS 304. CSA certified inspectors may be located here. Cylinder life cannot be extended. Expired cylinders must be removed from service.