Various factors can accelerate deterioration of CNG storage cylinders and allowing defective/damaged cylinders to remain in service can lead to rupturing.
These photographs are examples of ruptured storage cylinders that usually have sub sequential damage, injury or even loss of life.
Most CNG cylinder failures could have been prevented by regularly conducting a visual examination of the CNG system. This should include inspection of the cylinders, brackets, mounting points/hardware, valves and high pressure lines/fittings.
Ensuring that the 3 year 36,000 mile system inspection is carried as per guidelines by a qualified/certified inspector can help prevent premature failure of the CNG system/components.
If a vehicle fitted with a CNG system and is involved in an accident exceeding 5mph then the same standards apply, system inspection must be conducted by a qualified/certified inspector.
When purchasing a vehicle with a CNG installed system or installing an aftermarket CNG system, it is essential to ensure that the vehicle meets FMVSS 304 requirements. This regulation covers the “crash test” criteria and identifying if the vehicle is FMVSS 304 compliant could “save lives” in an impact.
More information available right here.