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What is CNG?

CNG - Compressed Natural Gas

CNG (Compressed natural gas) (Methane stored at high pressure) can be used in place of gasoline (petrol), Diesel fuel and propane/LPG. CNG combustion produces fewer undesirable gases than the fuels mentioned above. It is safer than other fuels in the event of a spill, because natural gas is lighter than air and disperses quickly when released. CNG may be found above oil deposits, or may be collected from landfills or wastewater treatment plants where it is known as biogas.

CNG is made by compressing natural gas (which is mainly composed of methane, CH4), to less than 1 percent of the volume it occupies at standard atmospheric pressure. It is stored and distributed in hard containers at a pressure of 200 - 248 bar (2,900 - 3,600 psi), usually in cylindrical or spherical shapes.


Frequently asked questions?

Is CNG a safe gas?

Yes, it is absolutely safe as a gas. Being lighter than air, in case of a leak it rises up and disperses into the atmosphere. This property precisely makes it a safe fuel.

What is different about CNG against other gases which are in use currently?

In the past, gas-fuelled automobiles used LPG. Today it is compressed natural gas (CNG) that is in use. Methane is the prime component of CNG while LPG is a blend of propane, butane and some other chemicals.

Can an existing LPG vehicle run on CNG?

An LPG-fuelled vehicle will not run on CNG as the two fuels are different from each other, have differing calcrific values and need different air-fuel ratios for combustion. CNG has to be stored at relatively higher pressure in a cylinder than LPG, so the same cylinder cannot be used for both gases. A vehicle will need specific conversion for CNG operation.

Can my automobile run on Petrol once the CNG in my fuel tank gets consumed ?

Yes, your automobile can run on Petrol once the CNG in my fuel tank gets consumed. You are provided with a switch on the dashboard of your car. So once you flip the switch, you can make the car operational on petrol or CNG alternatively.

Is CNG popular worldwide?

Yes. CNG has many benefits and it is good for the environment. CNG or Natural gas as a vehicle fuel has a long and established record in Europe, Canada, India, New Zealand, Australia and in USA. Other countries such as Japan, Mexico, Malaysia, Pakistan, and Bangladesh are recognizing the benefits of CNG and plan to expand its use.

Is it too expensive to convert a vehicle to CNG-friendly?

No, it is not very expensive. Moreover the cost of CNG is comparatively much less than Petrol which makes it more useful and beneficial. The cost of converting a vehicle to CNG depends on its type and make.

The fuel bill on the basis of average running of vehicle is reduced by 50 percent approximately after conversion of CNG at the present price of CNG & Petrol.

How does a CNG vehicle compare to a petrol powered one on performance parameters?

Easy starts, steady idling and smooth acceleration are virtues of CNG run vehicles. Power loss of 5-15 per cent means that acceleration is slower, which can be eradicated with spot-on tuning of the CNG kit, by advancing spark timing to derive benefit of its high octane rating. However the power loss is less than noticeable in city driving.