3.4.2  Compressed Natural Gas (CNG)

• CNG is natural gas that has been processed and pressurized, typically between 3,000 and 4,000 pounds per square inch (205 to 275 bar).

• It can be used as a substitute for diesel or petrol.

• Natural gas consists mainly of methane (70-90%), ethane (5-15%), propane (less than 5%) and smaller quantites of carbon dioxide, nitrogen, helium and hydrogen sulfide.

• When natural gas is used as a fuel all other gases, other than methane, are removed.

• Vehicles using CNG require more space for fuel storage than those using  petrol or diesel which impacts on the shape of the smaller vehicles.