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Title: Operations Of On-Line Chromatography Methods, Installation, Operation And Maintenance
Author: Paul E. Kizer
Source: 1994 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1994
Abstract: Gas chromatography is today being chosen more and more in the natural gas industry for on line monitoring of gas quality because the calculations of the gas volumes in modem electronic flow meters requires not only BTU information, but specific gravity, Mol % CO2 and Mol % N2 as weU. The current AGA-8 super compressibility equations also require methane concentration for the gross method and a complete analysis for the detailed method of calculation of Fpy. Most natural gas custody transfer contracts use MMBTU rather than MCF as the accounting units of gas transfer today. Also, modem micro-packed columns are providing faster cycle times for critical BTU measurement applications. For all these reasons mentioned above, and the fact that the installation requirements for chromatographs are less stringent than calorimetric methods, the use of gas chromatographs is quickly becoming standard practice.

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