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Title: Btu Analysis Using A Gas Chromatograph
Author: Michael Gaura
Source: 2011 International School of Hydrocarbon Measurement
Year Published: 2011
Abstract: Prior to 1978, most custody transfer of natural gas contracts were based on the volume of gas being transferred between the parties. In 1978, congress passed the Natural Gas Policy Act that mandated the custody transfer of natural gas based on the energy content, creating the need to determine the energy content of the natural gas at the custody transfer location. An instrument that burnt the gas and measured the heat output of the flame, a calorimeter, was then widely used to determine the energy content. In the mid-eighties, the functionality and reliability of gas chromatographs (GC) began to surpass the calorimeter and the GC eventually took over the energy measurement role to become the most common method for determining the energy content of the gas. This paper will provide an overview of the considerations for online measurement of BTU and how the GC calculates the energy content

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