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Title: District Pressure Control For The Next Millennium - Benefits Of Automation
Author: Stephanie Law Tony Hranicka
Source: 2000 Appalachian Gas Measurement Short Course
Year Published: 2000
Abstract: Natural gas distribution companies are responsible for operating their system within a safe pressure range. Regulator setpoints are normally fixed for anywhere between 3 and 12 months at a time. In areas where there are extreme seasonal temperature variations, regulator setpoints are often adjusted more frequently to correspond to the changes in demand. These setpoints are determined by evaluating the system demand during peak load. The regulator must be set high enough to maintain system pressure during cold weather periods and peak time of day. Figure 1 shows a typical gas distribution network or grid. Multiple district regulators (DR) are supplying gas to end users signified by circles. The diamonds represent the systems low-pressure point (LPP), extremity point, or sometimes called an end point. This point is where the pressure is always the lowest due to location or piping restrictions. The district regulator is set at a pressure high enough to maintain a minimum operating pressure at the low point during the anticipated peak load which is expected to occur for only a few hours on the coldest day of the year.

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