Today's CNG cylinders are certified for a 25-year life, but older cylinders were certified for shorter lifespans. "Tanks cannot be recertified after reaching the expiration date set at time of manufacture and must be taken out of service. That leaves vehicle owners two options: retire the vehicle or replace the cylinders."
A notice from the National Highway Traffic Safety Administration states "cylinders should be inspected for damage or deterioration every 36 months or 36,000 miles, whichever comes first, or after a fire or accident."
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