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Title: Energy Metering At The Flow Measurement Station
Author: Reed Mitchell, Barry Balzer, Paul Kizer
Source: American Gas Association 2006
Year Published: 2006
Abstract: Most natural gas custody transfer contracts today have at least a Btu specification and many use MMBtu (million Btu) rather than gas volume for custody transfer measurement. A Btu, British thermal unit, is a measure of heat or Calorific Value, CV. One Btu is the quantity of heat required to raise the temperature of one pound of water from 58.5F to 59.5F (A CV of about 1055.056 Joules (SI)). Heat (Enthalpy or Btus) is gained from the burning of Natural Gas in air, is called Oxidation. The higher the Btu content, the more energy can be obtained from burning the gas. It just doesnt take as many cubic feet of gas to heat the home hot water tank if the gas is 1090 Btu instead of 940 Btu per Scf. The Btu, then, is the measure of the actual amount of heat energy contained in a cubic foot ( cf ) of this natural gas.

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