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Compressed Natural Gas (CNG)


Why CNG?

Compressed Natural Gas (CNG) is Clean, American, Affordable & Abundant.

The CNG used in Natural Gas Vehicles (NGV's) is the same natural gas that is piped into millions of homes for cooking and heating. CNG is odorless, colorless and tasteless and consists mostly of methane (CH4).

CNG, although a fossil fuel, is different from gasoline, diesel and coal because it does not contain the same harmful compounds found in other fossil fuels. CNG has negligible sulfur dioxide content, does not contain lead, has low nitrogen dioxide content, a low particulate content, and low carbon monoxide content. As well, CNG does not require carcinogenic (cancer-causing) additives to boost octane levels because natural gas is naturally high in octane. CNG is not toxic or corrosive and will not contaminate ground water.

Benefits from using CNG:

  • Making America less dependent on foreign oil is a national priority
  • Reduces urban smog reduction, burns cleaner and produces lower levels of harmful pollutants
  • It's safe and lighter-than-air, CNG is nontoxic and dispenses quickly. It has a higher ignition temperature than gasoline and diesel fuel, which reduces the chances of accidental ignition
  • Contains no particulates like diesel fuel and reduces emissions of carbon dioxide - the principal "greenhouse" gas. Vehicle emissions are lower with natural gas than with gasoline because ignition temperatures are higher and combustion is more efficeient.
  • Engine maintenance cost can be reduced by extending time between oil changes. The particulate materials that are produced during the combustion cycle cause engine oil to get dirty and not present in the CNG
  • Readily available. The United States has a huge natural gas resource base. All 50 states and all major metropolitan areas have access to natural gas
  • It's the most practical. Any vehicle can be converted. Half of infrastructure already exist, we have 6 million miles of under ground gas piping
  • Economical - Natural gas is piped directly to the fueling station, reducing the cost of transportation.

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Is CNG Safe?

CNG is one of the safest transport fuels available.

CNG is actually safer than petroleum. In its natural state, natural gas is odorless. As a safety measure, the gas is odorized with Mercaptan to provide a ready means of leak detection.

CNG has a high ignition temperature of 1,200 degress Fahrenheit, compared to gasoline of 600 degress Fahrenheit. CNG has a narrow range of flammability, 5% to 15% of air. The high ignition temperature and limited flammability range make combustion of CNG unlikely

Natural gas has no known toxic or chronic physiological effects (it is not poisonous).

CNG is lighter than air. Unlike fuels such as diesel, petrol or LPG which are heavier than air, and pools on the ground creating a fire hazard and potential pollution to waterways. Should a CNG leak occur, the gas will disperse rapidly upgwards into the atmosphere and dissipate.

CNG Fuel Systems - They are "sealed," which prevents any spills or evaporative issues.

CNG fuel storage cylinders - They are much, much stronger than petrol tanks. The design of the cylinders is subject to a number of "severe abuse" tests such as heat and pressure extremes, gunfire, collisions and fire. The systems are also fitted with valves and oter safety devices to prevent leakage and eliminate the risk.

CNG Cylinder pressure - as CNG is stored at high pressure, it is often perceived that the high pressure of the product makes it more hazardous than other fuels. While a high pressure gas leak tends to make a lot of noise as the gas is escaping. The resulting high concentrations of gas and its tendency to dissipate upwards make it less likely for the gas in the immediate vicinity of the leak to ignite.

Safe Distribution of CNG - In most circumstances, CNG is delivered via underground pipeline networks. The method not only eliminates the need for road tankers to deliver fuel from the refinery, but also the need for ocean going oil tankers to deliver crude oil to the refinery.

CNG produces far less urban emissions than diesel vehicles. For example, even with the stringent 2010 EPA heavy-duty engine emission standards, CNG will be producing only one-sixth the NOx of comparable ediesel engines. NGV's have a deserving reputation for being one of the cleanest transport fuels available, not just with respect to vehicle emissions, but also for fuel production. Even when measured against the other 'clean' fuels or methods, such as gasoline-electric hybrids, CNG emissions are frequently lower.


Where does CNG come from?

Most natural gas consumed in the United States is domestically produced in 2 ways

  • Gas streams produced from fossil fuel reservoirs contain natural gas, liquids, and other materials. Processing is required to separate the gas from petroleum liquids and to remove contaminants.
  • Biogas is a mixture of methane and other gases produced from the decomposition of organic materials. It is produced naturally in landfills, and from the processing of animal waste, sewage, crop waste, cellulosic and non-cellulosic crops. An energy-wise and greenhouse gas-wise alternative is to capture the biogas from these renewable waste sources, convert that biogas to bio-methane, and use the bio-methane to displace petroleum or other fossil fuels in transportation or other energy applications.

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