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Title: Energy Measurement Utilizing On-Line Chromatograph
Author: Paul E. Kizer
Source: 1995 International School of Hydrocarbon Measurement
Year Published: 1995
Abstract: Most gas contracts today have at least a BTU specification and many use MMBTU (million BTU) rather than gas volume for custody transfer measurement. Gas chromatography is today being chosen more and more because the calculations of the gas volumes in modem electronic flow meters requires not only BTU5 information, but specific gravity, Mol % CO2 and Mol % N2 The new AGA-8 supercompressibility equations also require a complete hydrocarbon analysis. What then, is a BTU? 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 58.5F to 59.5F (about 1055.056 joules (81)). 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.

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