CNG stands for compressed natural gas. It is gaseous fuel and is a 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.CNG is a fossil fuel substitute for other auto fuels such as petrol, diesel, Auto LPG etc..
CNG is known for being one of the cleanest transport fuels available, not just with respect to vehicle emissions, but also for fuel production. CNG is a viable alternative fuel particularly useful in the transportation sector.
It is quickly becoming the preferred transportation fuel for vehicles of all sizes because of price stability, lower maintenance costs and less emissions.
l kinds of vehicles can run on CNG by installing CNG kit. Kit is an assembly of many components required to run existing vehicle on CNG. There are few basic components which are common in all type of kits, irrespective of the vehicles; such as CNG storage cylinder, high pressure tube, pressure regulator, pressure gauge, change over switch, high pressure tube fittings, refuelling receptacle and air fuel mixer.Major components of CNG kit for carburettor fitted petrol vehicle are illustrated below:
PCNG stands for compressed natural gas. It is gaseous fuel and is a 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.
Yes, it is safe. 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 CNG’s concentration in the air is less than 5% and more than 15%, the gas will not burn even in the presence of a spark.
All spark-ignited 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.
Yes, after conversion to CNG the vehicle can run on petrol whenever desired simply by flicking a switch on the dashboard.
CNG cylinders are manufactured from a special steel alloy and are seamless in construction. Their compact size allows them to easily fit even in a small car. An empty CNG cylinder with a 50 litre-water-carrying capacity weighs 48 kg, with a length of 835 mm and a diameter of 316 mm. The 50 litre capacity cylinder is the one most regularly used; cylinders with 45 litre, 55 litre, 60 litre and 65 litre capacity are used as well.
Under city road conditions and may vary from vehicle to vehicle and driving habits.
CNG cylinders are designed and built in such a way so as to withstand high pressure. The maximum pressure in a CNG cylinder is up to 200 kg/cm2 (g) (about 2840 pounds per square inch (gauge) or psi[g]). CNG cylinders are safe as they are manufactured as per specific requirements and tested before use, in accordance with international specifications and standards and they are duly approved by Chief Controller of Explosives. Moreover, these have been provided with a 'safety burst disc' such that in case of inadvertent high-pressure/high temperature at the time of filling or at any other time, this disc is ruptured and pressure released.
The fuel bill on the basis of average running of vehicle is reduced by 40 percent approximately after conversion of CNG at the present price of CNG & Petrol.
CNG kit is safe and simple. It gives years of trouble free operation. It doesn’t require frequent servicing. Just as for all other fuels, it is advised to have routine services. An authorized person should be consulted for service. As per Gas Cylinder Rules, 1981, the cylinder should under go hydro-stretch testing every 3 years to check pressure tolerance.
Owing to CNG's distinct features, it does not contaminate or dilute crankcase oil, giving a new lease of life to the engine. The absence of any lead content in CNG helps avoid lead fouling of plugs, thereby enhancing plug life. One of the important benefits of CNG is that upon entering the engine in the form of a gas (and not as a spray or mist like other fuels), it doesn't disturb the presence of lubricating oil in the engine, and reduces chances of wear and tear.
Yes, a diesel vehicle can be converted to run on CNG, but the conversion cost is higher than the conversion of petrol vehicles and under the current technology it can not run on duel fuel mode.
CNG is an environment friendly fuel. The natural gas is mainly composed of methane and its exhaust emissions consist of water vapors and a small fraction of carbon monoxide. The absence of carbon and other particulates result in negligible amount of harmful elements in exhaust fumes.
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.
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, Bangladesh are recognizing the benefits of CNG and plan to expand its use.
India is one of the world’s largest economies, and its energy requirements immensely determine its development. The natural gas market outlook is changing with time, and the Government of India wants to make it a gas-based economy.
80% less carbon monoxide emissions and 44% per cent fewer hydrocarbons are released into the air when CNG is burnt in comparison to petrol-powered vehicles.CNG gives better mileage in comparison to petrol and diesel. 1-kg of CNG generally takes you more than one liter of petrol.
RTO Approved CNG Kit Retrofit Centers to be displayed GA wisePlease click here to see the CNG retro fitment centre
Following precaution are to be followed during servicing and repairing of CNG vehicles :