Compressed natural gas storage cylinders have a very high factor of safety.

Fuel tanks for liquid petroleum fuels are not highly engineered and are easily punctured during an accident. LPG cylinders are also easily punctured as they are only designed for low pressures. These tanks are low cost and are never required to be retested. Conversely, compressed natural gas cylinders are engineered, designed, manufactured and tested to very high safety standards. This includes tests where the cylinder must not rupture following penetration from an armour piercing bullet nor following being completely engulfed in a fire for an extended period. CNG cylinders are required to be retested every five years to ensure that they remain within safety limits.



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