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Compressed Natural Gas (CNG)

About CNG

Compressed Natural Gas (CNG) is a cleaner alternative to traditional fuels like petrol, diesel, and Auto LPG. It is derived from natural gas and compressed to a pressure of around 200 Kg/cm² before being supplied to vehicles, allowing more fuel to be stored efficiently in cylinders. 
Today, almost all auto-rickshaws and taxis are running on CNG. It is also supplied to transport undertakings such as ASTC buses. Apart from this, passenger cars, postal vans, school buses, courier vans, as well as light and heavy commercial vehicles are also benefiting from the use of CNG. 
Purba Bharati Gas Private Limited (PGBPL) plays an important role in promoting clean energy by supplying CNG through its infrastructure. The company currently operates 7 CNG stations, including 2 in the Silchar region (Sonaparighat) and 5 in the Guwahati region (Ulubari, Pamuhi, ISBT, and Sonapur), ensuring consistent fuel availability and supporting the shift toward greener and more sustainable transportation.

Conversion to CNG

Standard CNG kits are available for any three- or four-wheeler. Components include storage cylinder, high-pressure regulator, pressure gauge, changeover switch, high-pressure tube/fittings, CNG level indicator, and air-fuel mixer.

Advantages of CNG
  • ✔ Cost effective – cheaper than conventional fuels with a short payback period (3-4 years).
  • ✔ Longer engine life – non-toxic, non-corrosive, and non-carcinogenic fuel that does not affect engine oil.
  • ✔ Low pollution – minimal emissions and no unpleasant exhaust smell.
  • ✔ High safety – lighter than air, structurally sound cylinders, high ignition temperature, and rigorous safety testing.
Impact on Environment

Transitioning to CNG helps reduce air pollution and greenhouse gas emissions. Natural gas is a key part of smarter, cleaner energy choices, contributing to a healthier environment for communities worldwide.

Prices
Entity NameDistrict CoveredProductGA NameEffective FromRetail Selling Price
PBGPLCachar, Hailakandi, KarimganjDomestic PNG9.02Jun-24Rs 55.5/SCM
PBGPLKamrup, Kamrup MetropolitanCNG9.03Jan-23Rs 87/KG

CNG - Reduced Environmental Impact

CNG engines run more quietly due to the higher octane rating of CNG over gasoline and produce less exhaust emissions. Harmful emissions such as carbon monoxide (CO), carbon dioxide (CO2), and nitrous oxide (N2O) can be reduced by as much as 95% compared to gasoline-powered vehicles.

CNG contains no additives and burns cleanly, leaving no by-products to contaminate spark plugs or engine oil. CNG is almost two-thirds the price of super gasoline, resulting in substantial fuel savings.

CNG is lighter than air, so in case of leakage, it disperses quickly into the air rather than staying on the ground, reducing the risk of fire and ground contamination.

Do & Don't

Do's

  • Switch off engine while fuel filling.
  • Apply hand brakes while fuel filling.
  • Get the CNG cylinder checked every three years from a government authorized testing agency.
  • Ensure installation/servicing of the CNG kit is done by an authorized workshop.
  • Always keep the certificate of the CNG kit and cylinder.
  • Keep a portable fire extinguisher and a First Aid kit in the vehicle.

Don'ts

  • LPG, propane, or any other cylinder should not be used instead of a CNG cylinder.
  • Do not start engine or board the vehicle while fuel filling.
  • Avoid carrying inflammable material near the CNG cylinder.
  • Never fill any gas other than CNG.
  • Do not place any luggage or load over cylinder as it may damage the cylinder pipe, hose, valve, etc.
  • The CNG cylinder should not be repaired under any circumstances; consult an authorized workshop in case of any problem.

FAQs

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

The conversion cost depends on the type and make of the automobile and the conversion kit. Roughly it varies between Rs. 25,000 to Rs. 50,000.

Yes. You can switch on your dashboard between CNG and petrol, allowing alternate operation.

The tank stores 8–10 kg of CNG (about 60 water liters). A 1200cc car can run 175–200 km per fill.

An electronic fuel management system on your dashboard shows the CNG level in your vehicle.

No. CNG doesn’t harm your engine. It avoids lead fouling, preserves lubricating oil, reduces wear and tear, and does not contaminate crankcase oil.

Diesel vehicles can be converted to run on CNG, but cannot run in dual fuel mode. Conversion cost is higher than for petrol vehicles.

Large-scale CNG usage reduces pollution, lowers CO₂ emissions, saves fuel costs, and creates business & employment opportunities.
Retail Selling Price for GA-9.03 & GA-9.02
GA DPNG (Rs./SCM) CNG (Rs./Kg)
9.02 55.50 86.50
9.03 55.50 87.00
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