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Title: Energy Measurement Using On-Line Chromatographs
Author: Paul E. Kizer
Source: 2007 International School of Hydrocarbon Measurement
Year Published: 2007
Abstract: Most natural gas custody transfer contracts today use MMBtu2 rather than Mcf as the accounting units of gas transfer. This is, of course, a result of the Natural Gas Policy Act of 1978 (NGPA). An MMBtu, some times called a dekaTherm, is calculated by: Btu/cf * MMcf MMBtu A Btu is the acronym for British thermal unit. One Btu is the quantity of heat required to raise the temperature of one pound of water from 58.5oF to 59.5oF (about 1055.056 joules (SI))3. The Btu, then, is the measure of the actual amount of heat energy produced when a cubic foot (cf) of this natural gas oxidized, that is, burned.

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