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Compressed Natural Gas (CNG) | HCG: Haryana City Gas

CNG stands for compressed natural gas. CNG is gaseous fuel-mixture of hydrocarbons mainly Methane. For use in Automobiles as fuel, it is compressed to a pressure of 200-250 Kg/cm² to enhance the vehicle on-board storage capacity.

Properties Unit Petrol Diesel LPG CNG
Relative density Water = 1 0.74 0.84 0.55
Relative density Air =1 1.285 0.61
Auto-ignition Temperature Degree C 360 280 374 540
Flammability Range % in Air 1-8 0.6-5.5 2.2-9.0 5-15
Flame Temperature Degree C 2,030 1,780 1,983 1,900
Octane Number 87 93 127

CNG Benefits:

  • A Clean & Green fuel: Commonly referred to as the green fuel because of its lead and sulphur free character, CNG reduces harmful emissions. Due to the absence of any lead or benzene content in CNG, the lead fouling of spark plugs and lead or benzene pollution are eliminated.
  • Increased life of oils: Another practical advantage observed is the increased life of lubricating oils, as CNG does not contaminate and dilute the crankcase oil.
  • Mixes evenly in air: Being a gaseous fuel CNG mixes in the air easily and evenly.
  • Safety: CNG is less likely to auto-ignite on hot surfaces, since it has a high auto-ignition temperature (540 degrees centigrade) and a narrow range (5%-15%) of inflammability. It means that if CNG concentration in the air is below 5% or above 15%, it will not burn. This high ignition temperature and limited flammability range makes accidental ignition or combustion very unlikely.
  • Low operational cost: The operational cost of vehicles running on CNG, as compared to those running on other fuels, is significantly low.At the prevailing price of fuel in Gurgaon, operational cost of CNG vehicles is 68% lower than petrol and 36% lower than diesel.