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Title: Automatic Demand Control On Distribution Intermediate() Pressure
Author: C. H. Bryan
Source: 1936 Southwestern Gas Measurement Short Course (Now called ISHM)
Year Published: 1936
Abstract: To the writer, the above subject divided itself into at least four subheadings. First, why is autonnatic control of distribution pressures desirable? Second, if it is desirable, what type or method of control shall we choose? Third, having made a choice, what operating advantages can we anticipate? Fourth, how will control affect our customer relationship? Physical laws have considerable influence over our decision in favor of automatic control of distribution pressures. We all appreciate that an intermediate pipe line system free of lealis will place gas at the disposal of the low pressure regulator. On the other hand, flow of this gas through the low piessure regulator is dependent on adequate pressure in the intermediate sy.stem. as well as facilities for handling adequate volume. Furthermore. not one but all low pressure legulator points must be thus served or customer contact fails. The ideal intermediate system would, therefore, be one having neither pressure drop nor variatioiis in pressure drop to the system. If unlimited tiemand or thi-oughput didnt change this condition, the system would always assure adequate pressure w-ithout excess pressure, resulting in minimum leakage.

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