April 29, 2013

Natural Gas

Compressed natural gas (CNG) vehicle

Natural gas accounts for around a quarter of the energy used in the United States. A third of it is used at home for cooking and heating, one-third to industrial uses, and another third to electric power production. It is clean-burning, but only 1/10 of 1% is used as transportation fuel. Over 94% of U.S. natural gas is domestically produced.

There are two forms of natural gas that are used in vehicles: compressed natural gas (CNG) and liquid natural gas (LNG). Both options are clean-burning and relatively low priced.

CNG is odorless, colorless, and tasteless. It is stored on board a vehicle in high-pressure cylinders. A vehicle that runs on CNG can reduce smog-forming emissions by 70 percent and have 20 percent fewer greenhouse gas emissions than a gasoline-powered vehicle. CNG can be used by light-, medium-, and heavy-duty vehicles.

LNG is created by purifying natural gas and super cooling it to -260 degrees Fahrenheit to become a liquid. LNG is stored in double-walled vacuum-insulated pressure vessels. LNG is usually used in medium- and heavy-duty vehicles.

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