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Title: Energy Measurement Using Flow Computers & Chromatography
Author: Jim Beeson
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
Abstract: Arkla Energy Resources has entered the field of electronic measurement as have the vast majority of the gas transmission companies in the United States. The gas measurement business has been headed in this direction for several years. There are numerous papers on this subject, charts versus flow computers and chromatographs versus calorimeters. This paper will describe how Arkla has approached it. Arkla is changing to electronic measurement for several reasons of which just a few are: increased accuracy and resolution, on line correction of flow variables, increased speed in data retrieval and processing, reduction of operational costs, and reduction in capital expenditures with short term return on investment. Arkla and our customers wanted access to volumes on a more timely basis. We can now retrieve our volumes, along with other pertinent data, via telemetry, on a daily basis in lieu of 6 weeks after the fact as in chart integration. A typical Arkla electronic measurement system consists of a microprocessor based flow computer with on-line pressure and temperature correction, a telemetry communication package and a gas chromatograph. Live gravity and BTU from a chromatograph are transmitted, in the form of analog current loops, to the flow computer. This has assured Arkla that current (updated every 6 minutes) gravity and BTU values are applied to the instantaneous volumetric flow computations. As with charts, this was done based on daily averages.

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