In the U.S.A., the National Highway Transportation Safety Administration (NHTSA) has jurisdiction concerning vehicle safety It requires that all CNG fuel storage cylinders have a label that (1) states the date of manufacture and the date that the cylinder is required to be removed from service (typically 15-20 years), and (2) instructs the vehicle owner/operator to have a qualified visual inspection of the tank every 36,000 miles or every 3 years (whichever occurs first) and/or after an accident or fire. Converters and vehicle owners should have documentation that this safety inspection has been done. Inspections are performed to look for tank and bracket damage (e.g., gouges, cuts, abrasions, dents, corrosion, rust, general wear, etc.). Qualified cylinder inspectors are located throughout the US and Canada. The cost/time associated with a cylinder inspection is minimal.