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Title: Theory And Application Of Gas Chromatography
Author: Mark F. Maxwell
Source: 2008 Appalachian Gas Measurement Short Course
Year Published: 2008
Abstract: In 1978, The Natural Gas Policy Act was passed by Congress as a method of deregulating the gas industry. This act specifi ed that natural gas was to be bought and sold based on energy content per cubic foot. This new standard combined volume measurement and gas heating value measurement to produce an energy measurement system for natural gas. As a result of this act, the on-line gas chromatograph has become a vital element in accurate energy measurement. The individual components of natural gas and the calculated heating value generally note the quality of natural gas. In the USA, the standard of measurement is in British Thermal Units (Btu). A Btu is generally thought of as the heat required to raise the temperature of one pound of water by one degree Fahrenheit. There are two general methods for determining Btu, direct and indirect. Calorimetry is a direct method while Chromatography is an indirect method.

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