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Title: Distribution Construction And Maintenance Automated Control Of Low-Pressure Systems
Author: W. E. Boldyreff And H. L. Thornton,
Source: American Gas Association 1971
Year Published: 1971
Abstract: Consumers Power Company, a combination utility, serves both gas and electric customers in out state Michigan. One of the means used to serve gas customers is low-pressure distribution. Low-pressure distribution systems normally operate in a pressure range of 7-inch to 18-inch WC with a maximum design pressure of 21-inch WC. The pressure control equipment is preset to maintain minimum systems pressures required to meet seasonal demands. Customers meters on the low-pressure systems are calibrated to a 6-inch WC base. To assure the 6-inch WC delivery pressure to all customers during peak conditions, regulator stations feeding the system were set at 18-inch WC for winter operations. During off peak periods which prevail, system pressures rise substantially above the 6- inch WC base. An inaccuracy occurs in metering during these off peak periods because of the elevated system pressures. In an effort to improve metering accuracy, automated pressure control equipment was installed on seven of the major low-pressure systems. These seven systems serve approximately 120,000 customers. The control equipment consists of sensing low-pressure poiniis in a system, transmitting this information to a division service center and transmitting control signals to regulator stations feeding that distribution system. The engineering and control concepts necessary to accomplish automated pressure control of the systems were developed by Commonwealth Associates, Inc., an engineering consultant in Jackson, Michigan. This presentation will describe the reason for the control system, the economic justification, the means utilized to determine the economy, the determination of low points and associated regulator stations in a system, the objectives of the system, engineering of the system, and the hardware used in the system.

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