What is Cng?

CNG or compressed natural gas is a domestically available, economical, clean burning, alternative fuel source for vehicles.

Rather than burn gasoline or diesel fuel, a consumer would fuel their vehicle with natural gas. In order to provide enough range, the gas is compressed and stored on the vehicle in pressurized tanks. Tanks that can hold up to 3,600 psi. hence the name Compressed Natural Gas.

Sounds a little scary doesn't it? Not when you compare the physical properties of Natural Gas and gasoline. The fact is that natural gas is a much safer fuel than gasoline (Ever wonder why the stove in your home doesn't burn gasoline instead of natural gas?).

What is Natural Gas?

Natural Gas is an organic compound that is found deep within the earth. It is a fossil fuel formed over millions of years of geological pressures and changes. Natural gas is primarily methane comprised of hydrogen and carbon. It is a safe fuel source that is commonly used in homes and businesses for heating, lighting and cooking.

How is it used for powering vehicles?

This is accomplished by the following steps:

• Natural gas is compressed and enters the vehicle through the natural gas dispenser or filling stations.
• It flows into high-pressure cylinders that are located on the vehicle.
When the driver steps on the accelerator, the natural gas leaves the on-board storage cylinder, passes through the high-pressure fuel line and enters the engine compartment.
• Gas then enters the regulator, which reduces pressure from up to 3,600 psi to approximately atmospheric pressure.
• The natural gas solenoid valve allows natural gas to pass from the regulator into the gas mixer or fuel injectors.
• Natural gas mixed with air flows down through the carburetor or fuel injection system and enters the engine's combustion chambers.
• One kilo of CNG is equal to roughly 1.5 litres of petrol.
• If we divide by four the total capacity of installed cylinders (expressed in litres), we obtain (with a good approximation) the equivalent CNG cubic meters contained in the tank.

For example in a 80 lt cylinder we have roughly 20 lt of equivalent CNG cubic meters. If we imagine running on average 14 km with a CNG cubic meter (equal to run roughly 12.5 km/lt with petrol), mileage will be roughly of 280 km.

Are Natural Gas Powered Vehicles safe?

Natural Gas an ideal fuel source for many reasons, including safety. Consider these points: Natural Gas is lighter than air. This means that it will not puddle (like gasoline) or sink to the ground like propane, which is heavier than air. Instead, Natural Gas will rise and dissipate in the atmosphere.

Natural gas also has a higher ignition temperature. This means that it is much harder to ignite. Also the storage systems used for compressed natural gas are infinitely stronger (therefore a lot less likely to rupture) that the gasoline tanks found on cars and trucks today.

Also see our conversion procedure.

What is Lpg?

LPG is a blend of propane and butane, Liquid Petroleum Gas (LPG) is produced either as a by-product of oil-refining, or from natural gas (methane) fields. As an alternative fuel Auto LPG it is most suited to use in cars and light vans, rather than heavy vehicles.

What are the environmental benefits of using an LPG vehicle?

Performance-wise, Auto LPG vehicles drive just like petrol vehicles and are subject to the same maintenance schedules.

It is generally accepted that Auto LPG gives a 10-15 per cent carbon dioxide reduction in comparison to petrol and is on a par with diesel. Auto LPG also delivers 80 per cent lower nitrous oxide emissions than diesel, along with zero particulate emissions.

With effect from April 24, 2000, the use of Auto LPG as an automotive fuel was made legal in India.

The Auto LPG conversion kit

The The Auto LPG conversion kit follows the dual fuel system of conversion. Under this system, all gasoline parts are retained as the system allows one to start and run the vehicle with either Auto LPG or gasoline with the help of a change over switch.

The components of the conversion kit are:

• Tank – contains the Auto LPG with capacity ranging from 30 to 100 liters.
• Multivalve – facilities refuelling, has an 80% stop-fill safety. i.e. it will automatically stop filling when it reaches 80% capacity.
• Device that acts as a shut-off valve in the event of the rupture of Auto LPG line.
• LPG Solenoid Valve – allows entry as well as prevents flow of Auto LPG to the system; depending on the mode selected.
• Gasoline Solenoid Valve – allows entry as it prevents flow of gasoline to the system; depends on the mode selected.
• Electronic Control Module – regulates the flow of LPG depending on the engine RPM (only in fuel injected models)
• Gas / Petrol Switch – allows change over from gasoline to Auto LPG
• Pressure Regulator on Vaporizer – facilitates vaporization of Auto LPG from liquid state
• Mixer or Gas Injection – introduces the vaporized Auto LPG in the combustion chamber.

Also see our conversion procedure.