ABSTRACT
The electronic process of collecting data inputs and performing the calculations in determining the flow of natural gas has been engineered by Natural Gas Pipeline Company of America, a subsidiary of MIDCON Corp. Natural Gas Pipeline Company has developed an electronic flow measurement system for custody transfer. There has been a lot said about electronic flow measurement replacing chart recorders and the potential savings in converting to electronic flow measurement. NGPL began considering electronic flow measurement with the installation of the Trailblazer pipeline. The electronic flow measurement for custody transfer system consists of a microcomputer, gas chromatgraph, H2O and H2S analyzer, a differential pressure, static and temperature transducers for each run, communications modem, power supplies and battery charger, printer, and console terminal. The microcomputer polls the chromatograph for gas heating value, specific gravity, gas composition for each analysis and 24-hour averages, the asynchronous digital link permits the program to remotely interrogate and gather data from the chromatograph.
