Benefits of CNG
Natural gas offers many advantages over conventional petroleum products. Compressed natural gas (CNG) is the smart and affordable choice for fleet vehicles, stage and contract carriages, waste disposal trucks, delivery vehicles, and more. With CNG, you’ll save money on fuel, reduce emission levels, and extend the life of your vehicle.
Reduced Fuel Cost –
Natural Gas (CNG) represents almost a 50% savings over conventional products such as petrol and diesel fuel. Over the last decade, the average cost per liter of petrol in Maharashtra has risen approximately 10%. In 2004, the average price per liter of petrol in Maharashtra was ` 37.00, today the average price is around ` 76.00. In a very competitive economy, there is no better time to look for alternative ways to fuel our vehicles.
Environmentally Friendly –
Compressed natural gas (CNG) is one of the cleanest burning transportation fuel on the market today. CNG burns cleaner than petroleum based products because of its lower carbon content. CNG produces the fewest emissions of all other fuels and contains significantly less pollutants than conventional liquid fuels. CNG produces 20-30% fewer greenhouse gas emissions and 95% fewer tailpipe emissions than petroleum products. And because CNG fuel systems are completely sealed, CNG vehicles produce no evaporative emissions.
Reduced Maintenance Cost –
CNG does not contain lead, so spark plug life is extended because there is no fouling. CNG does not dilute or contaminate crankcase oil, so intervals between oil changes and tune-ups are extended. Pipes and mufflers last longer because CNG does not react to the metals. All of this reduces maintenance costs while extending the overall life of the engine.
Performance Advantages –
CNG is superior to petroleum-based products because natural gas has an octane rating of about 127. CNG vehicles experience less knocking, no vapor locking, and since natural gas is already in a gaseous state, CNG vehicles have superior starting even under severe cold or hot weather conditions.
Safety Advantage –
Compressed natural gas (CNG) fuel storage tanks are stronger and safer than gasoline or diesel tanks reducing the likelihood of accidental release. If released, CNG disperses quickly into the air instead of on the ground, reducing the risk of fire and ground contamination. Plus, CNG gives off little to no emissions during refueling.
Also, CNG is less likely to auto-ignite on hot surfaces, since it has a high auto-ignition temperature (540°C) and a narrow range (5%-15%) of inflammability. It means that if CNG concentration in the air is below 5% or above 15%, it will not burn. This high ignition temperature and limited flammability range makes accidental ignition or combustion very unlikely. A few characteristic comparisons of CNG with other conventional fuels are given in Table 1
|Relative density||Water = 1||0.74||0.84||0.55||–|
|Relative density||Air =1||–||–||1.285||0.64|
|Flammability Range||% in Air||1-8||0.6-5.5||2.2-9.0||5-15|
|Flame Temperature||Degree C||2,030||1,780||1,983||1,900|