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Q. What is natural gas?

A: Natural Gas is primarily methane-CH4 with a small percentage of other higher hydrocarbons. The ratio of carbon to hydrogen is least in methane and hence burns almost completely making it the cleaner fuel. PNG is produced from the oil/gas wells after purification the gas is transported through a network of pipelines across the country up to the consumer end. Natural gas is most versatile fuel which can replace most of existing form of fuels.

Q. Where is NG stored?

A: NG is not stored at one place but is continuously supplied through pipelines; it is safe than LPG which is stored in cylinders.

Q. Is Piped Natural Gas, as a domestic fuel, better than LPG?

A: Yes, refer benefits.

Q. Is the supply of PNG regular?

A: Yes, the supply is absolutely regular. The pipeline distribution network is based on an on-line supply system that consists of safety valves and regulators that control and monitor the gas supply and pressure, and assist in identifying system leaks. Thus an un-interrupted supply at a constant pressure is assured.

Q. Is it required to change the LPG appliance for switch over to PNG?

A: PNG works on a cooking appliance just like LPG does. It does not require any change in the appliance, but with some minor modifications LPG appliance can be easily converted to PNG.

Q. What becomes of the LPG cylinders after the cooking appliance gets converted?

A: The LPG connection can be surrendered to the respective gas cylinder company and security deposit can be refund obtained.

Q. What is a domestic PNG connection?

A: A domestic PNG connection includes conversion of one LPG appliance (extra cost for more than two burners) to PNG, laying of associated galvanized iron (GI) pipeline network, along with necessary fittings, pressure regulator and a meter.

Q. What is the cost of getting a PNG connection?

A: Cost of PNG connection is dependent on the type of house or establishment and installation charges as applicable at the time of registration. Applicable refundable interest-free security deposit is to be deposited for a PNG connection.

Q. What is the system of billing?

A: Billing is based on the meter readings taken by the authorized staff once in two months for the domestic consumers daily for commercial customers. The bills are delivered at the customer's residence. The payment of the bills can be made by using any of the payment modes as acceptable by HCGDL.

Q. How are customer queries and complaints attended to?

A: We have 24 hour helpline service for attending your queries / complaints. Our network of control rooms are manned 24 hours by Engineers and trained technicians to address any queries / complaints.

Q. How PNG is safer than LPG?

A: The combustible mixture of natural gas and air does not ignite if the mixture is leaner than 5% and richer than 15% of the fuel –air ratio required for ignition. This narrow inflammability range makes PNG one of the safest fuels in the world.

Natural gas is lighter than air. Therefore, in case of a leak, it rises up and disperses into air given adequate ventilation is available. But LPG being heavier settles at the bottom near the floor surface.

PNG is safer since installation of PNG inside your premises contains only a limited quantity of natural gas at low pressure. On leakage, LPG expands 250 times, which is not the case with PNG. PNG Supply can be switched off through appliance valve (inside the kitchen) and isolation valve (outside kitchen premises), which cuts off the gas supply.


Q. What is CNG?

A: CNG stands for Compressed Natural Gas. It is a gaseous fuel and is a mixture of hydrocarbons, mainly methane, in the range of 89% to 90%. It is compressed to a pressure of 200-250 kg/cm² (g) to enhance the vehicle on-board storage capacity.

Q.Is CNG safe?

A: The properties of CNG make it a safe fuel. It is lighter than air, so in case of a leak it just rises up and disperses into the atmosphere. Besides, a high auto-ignition temperature of 540 degrees centigrade as against petrol's 360 degrees centigrade makes it a safe fuel. Also, in case of a leak, if Cog's concentration in the air is less than 5% or more than 15%, the gas will not burn even in the presence of a spark.

Q. What is involved in converting a vehicle to a CNG-friendly one?

A: All petrol and diesel engines can be converted to CNG, but a specially designed conversion kit is required for the purpose. The kit consists of a cylinder to be fixed in the boot of the car and other equipment to allow gas flow into the engine.

Q. Can a car fitted with CNG conversion kit run on petrol after its CNG gets over?

A: Yes, even after conversion to CNG, the vehicle continues to be fitted with the petrol carburettor and fuel tank. The vehicle can therefore run on dual fuel, either on CNG or petrol, whenever desired, simply by flicking a switch on the dashboard.

Q. How does the performance of a CNG-converted vehicle compare with that of a petrol-run vehicle?

A: CNG provides easy starting, reliable idling and smooth acceleration. The acceleration of a CNG vehicle is a bit slower, which is due to a power loss of 5-15%. This can be minimised by proper tuning on CNG (e.g. advancing the spark timing) to take advantage of the high octane rating of the fuel.

Q. Can diesel vehicles be converted to CNG?

A: Yes, a diesel vehicle can be converted to run on CNG, but the conversion cost is higher than the conversion of petrol vehicles.

Q. How does large-scale CNG usage benefit the country?

A: CNG emits less carbon dioxide and other pollutants as compared to liquid fuels. Thus, CNG contributes in lowering air pollution, also helps in improving the Balance of Payments by acting as a substitute for imported liquid fuels, provides more business and job opportunities with the opening up of a new sector, and being competitively priced, it appeases motorists.