All three fuels, CNG, LPG, and petrol, are flammable, but with varying degrees of flammability. Here's a brief comparison:

CNG (Compressed Natural Gas): It has a narrow flammability range (5-15% in air) and is lighter than air, making it less likely to ignite and accumulate in dangerous concentrations compared to gasoline.

LPG (Liquefied Petroleum Gas): It's also known as cooking gas. It's heavier than air and can pool in low-lying areas, increasing the risk of fire or explosion if ignited.

Petrol (Gasoline): It has a wider flammability range than CNG and LPG, making it more prone to igniting.

Which even means CNG is safer than petroleum

Which has the greatest risk for BLEVE and why?