What is CNG? | Advantages, Disadvantages and Applications

CNG extraction equipment: a rig used for drilling, extracting, and processing natural gas.

What is CNG?

Compressed Natural Gas (CNG) is usually composed of methane mainly a fuel gas that is compressed to less than 1% of its original volume at regular atmospheric pressure. It is often spherical or cylindrical and kept and dispersed at a pressure of 20–25 megapascals in hard containers. It can be used in place of petrol, diesel fuel, and liquid petroleum fuel. When CNG is used, less toxic gases are released into the atmosphere than when other fuels are consumed. Natural gas is less dangerous than other fuels in the event of a leak since it is lighter than air and spreads more quickly when discharged.

What are the Advantages of CNG?

  1. CNG IS CLEANER: CNG has cleaner air compared to conventional petrol systems, CNG fuel systems have emissions that are up to 90% less. It is less expensive and emits fewer pollutants than conventional fossil fuels like petrol and diesel, compressed natural gas (CNG) is seen as a greener fuel option. One reason someone might opt to convert to a new CNG vehicle is that it burns cleanly and leaves no harmful particles behind.
  2. Cost Effectiveness: It is affordable. CNG is more cheap than petrol and diesel since vehicle maintenance costs less.
  3. Fuel: Fuel is defined as any material that may react with other substances to generate heat energy or be utilized as fuel. Compressed natural gas (CNG), sometimes known as “green fuel,” minimizes hazardous emissions since it is lead and sulfur-free.
  4. Safety: CNG’s high auto-ignition temperature of 540 degrees Celsius makes it less likely to self-ignite on hot surfaces. Compressed Natural Gas cylinders are designed with safety and durability in mind. They are designed to withstand circumstances with extreme pressure. The safety mechanisms in these cylinders are intended to discharge the gas if the pressure or temperature rises over normal. 
  5. Environmentally Friendly: One of the main benefits of Compressed Natural Gas vehicles is their greater environmental friendliness compared to vehicles that run on petrol or diesel. It is not harmful to the environment. By far, it is simpler to store and safer. It is trustworthy. When compared to other fossil fuel energy sources, it is less expensive.


  1. Minimal Running Costs: CNG-powered vehicles have much lower operating costs than cars using other fuels.
  2. CNG vehicles require less maintenance than gasoline-powered autos. This is because CNG burns cleaner than petrol, reducing strain on engine components. CNG does not include sulfur, particulate matter, heavy metal residues, or dangerous additives, thus your engine oil will not be contaminated.
  3. Environmental Benefits: The substantial decrease in greenhouse gas emissions is one of the main benefits of utilizing CNG cylinders. Low Effect on the Environment. One of the main advantages of Compressed Natural Gas is that it reduces greenhouse gas emissions by 13% to 17% from well to wheel.
  4. In addition to having less emissions than conventional petrol or diesel, compressed natural gas (CNG) may also be used for less money.

Disadvantages of CNG

  1. Boot Space: Boot space decreased. The first and most significant drawback that CNG car owners encounter is limited cargo capacity. CNG tanks are so large that they take up around 80-90 percent of your trunk space.
  2. Frequent service intervals: If you’re moving to Compressed Natural Gas, you’ll need to pay closer attention to your car’s servicing schedule.
  3. Limited Availability: One of the primary drawbacks of Compressed Natural Gas vehicles is that they are not as readily available as conventional fuel. 
  4. Low performance: When CNG cars run on Compressed Natural Gas fuel, they create much less power and torque than petrol engines. CNG vehicles perform less well than gasoline vehicles. This is because Compressed Natural Gas has a lower energy density than petrol.
  5. Hydrotesting: Another big drawback of using CNG is that you must get your cylinder hydro checked every three years. 
  6. The range is limited. Regardless of the sector, almost every Compressed Natural Gas automobile on the market comes with a 60kg water-equivalent Compressed Natural Gas tank.
  7. Decreased Resale Value: According to some statistics, the engine performance of Compressed Natural Gas cars often reduces by 10% after a year of continuous use. Reduced resale value.
  8. Pickup: Because it is a petrol fuel, it does not offer adequate lubrication for the engine, and if not properly maintained, it may fail.
  9. Lack of knowledge: Company fitting Compressed Natural Gas is a service in which the brand handles everything for you.

Applications of CNG

  1. Transportation: CNG can power natural gas automobiles as well as vehicles that operate on both natural gas and petroleum or diesel (bi-fuel vehicles). Unfortunately, Compressed Natural Gas cars have a lesser driving range than those driven by petrol. This makes it difficult to drive them for extended distances. They are good for urban transportation and public transportation, such as buses. However, bi-fuel vehicles, which can switch between petrol and Compressed Natural Gas, might overcome this problem.
  2. Vehicles: Compressed Natural Gas vehicles are believed to be quieter than petrol and diesel vehicles, resulting in less noise pollution. They also emit less pollutants and can increase energy security. 
  3. Industrial Applications: Fuel used to make paper, glass, bricks, steel, and iron. Raw materials are used to manufacture things such as hydrogen for sustainable energy. Fertiliser and extensively used petrochemical goods, such as cosmetics, pharmaceuticals, synthetic fibers, and plastics, rely on this essential building element.

Options for refueling CNG

  1. Fast Fill: Ideal for high-use automobiles, refueling is rapid and comparable to filling up with petrol or diesel.
  2. Time Fill: This slower refilling technique is usually used at home or work at night.
  3. Compressor-Based Refuelling: This technique, which is frequently used in industrial settings, uses a compressor to fill the tank.

Conversions of Vehicles to CNG

  1. Dedicated CNG Vehicles: These are automobiles made especially to run on compressed natural gas (CNG).
  2. Bi-fuel cars: these may run on petrol or compressed natural gas.
  3. Dual-Fuel Vehicles: Capable of running on diesel and Compressed Natural Gas.

Features of CNG Safety:

  1. High-Pressure Tanks: Built to endure tremendous pressure and conditions.
  2. Automatic Shut-Off Valves: Stop gas flow in the event of an accident or spill.
  3. Gas detectors: They notify drivers and passengers of potential gas leaks.

Compressed Natural Gas Infrastructure Development

  1. Public Refuelling Stations: Easy and convenient refueling options.
  2. Private refueling stations: For fleets, homes, and businesses.
  3. CNG Corridors: Specific routes with many refueling stations.

CNG Economic Incentives

  1. Tax Credits: The government provides incentives for acquiring Compressed Natural Gas cars or converting existing vehicles.
  2. Lower Fuel Costs: Compressed Natural Gas is typically less expensive than other fuels.
  3. Lower Maintenance Costs: Compressed Natural Gas cars need less maintenance.

Environmental Benefits

  1. Lower Greenhouse Gas Emissions: Compressed Natural Gas emits less than conventional fuels.
  2. Less Air Pollution: Compressed Natural Gas combustion emits less dangerous pollutants.
  3. Reduced Carbon Footprint: Compressed Natural Gas is a cleaner-burning fuel.

Understanding these elements of Compressed Natural Gas enables individuals and organizations to make educated decisions about embracing this alternative fuel source, leading to a more sustainable and environmentally friendly transportation sector.


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