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Title: Gas Regulation From High Pressure Transmission Lines
Author: J. E. Williams
Source: 1966 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1966
Abstract: High Pressure, as related to long distance transmission pipe lines, may not have a universal definition but in general, 500 to 1000 p.s.i.g. can be considered normal in the operation of natural gas transmission lines. Many pipelines built in the past fifteen years are designed for 1000 p.s.i.g. or more and operate at or near their capacity. In order to deliver gas to a user, pressures usually need reduction to meet the requirements of the end use. Deliveries vary widely, both in operating pressure and volume demands. Pressure may be required at only a very few pounds or at very nearly the transmission line pressure. Volumes may vary from only that required to supply a pneumatic controller or an individual farm tap customer to deliveries of several million cubic feet per hour. The large volumes would be to an industrial customer or an inter-pipe line delivery. The rate demand may be fairly constant or as erratic as onoff. Control may be required with little or no pressure variation from the set point, or a fairly wide swing in pressure may be permissable. The needs of the industry have been recognized by the manufacturers through the years of progress and development. Today it is possible to obtain regulating devices that will satisfactorily meet most any requirement. A good knowledge of the many makes and types available is a necessity to good pipe line engineering. A good understanding of each regulating problem is necessary to make a proper choice and meet specifications.

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