Since cars have already been running on gas, what is new about CNG?
CNG is made mainly of methane whereas LPG is a mixture of propane, butane and some other minor chemicals. Methane remains a gas even when compressed to very high pressures, hence the name Compressed Natural Gas (CNG). Natural gas can be liquified to give Liquefied Natural Gas (LNG) at the very low temperature of-160 centigrade. LNG has been used experimentally as vehicle fuel in USA and Germany. Propane and butane are gases at normal room temperature and pressure but become liquid under moderate compression; hence the name liquefied Petroleum Gas (LPG). CNG is a 100% locally produced fuel whereas LPG becomes available from two different sources i.e. refineries and oil wells. The LPG available from the refineries is a product mostly of imported crude oil and the available from wells is the form of associated gases. In addition, some LPG is also imported. Both LPG and CNG can be used as transport fuel but the Government wants to use LPG in the domestic sector, since it can easily be tran
