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Title: Automated Control Of Low Pressure Systems
Author: W. E. Boldyreff
Source: 1971 Appalachian Gas Measurement Short Course
Year Published: 1971
Abstract: Consumers Power Company, a combination utility, serves both gas and electric customers in outstate 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 to 18 WC with a maximum design pressure of 21 WC. The pressure control equipment is preset to maintain minimum system pressures required to meet seasonal demands. Customers meters on the low pressure system are calibrated to a 6 WC base. To assure the 6 WC delivery pressure to all customers during peak conditions, regulator stations feeding the system were set at 18 WC for winter operation. During off peak periods which prevail, system pressures rise substantially above the 6 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 points in a system, transmitting this information to a Division Servce Center, and transmitting control signals to regulator stations feeding that distribution system.

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