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Title: Over Pressure Protection Methods
Author: William H. Kamey
Source: 1986 International School of Hydrocarbon Measurement
Year Published: 1986
Abstract: The pressure reducing regulator in Fig. 1 is the basic device used to reduce the pressure from a high pressure source such as a transmission line to a lower pressure such as a d i s t r i b u t i o n piping system. The regulator has a history of very rel i a b l e service, but because it is mechanical it can f a i l . A regulator can fail in two worst case condi t i o n s , wide open or fully closed. The fully closed regulator failure requires an a l t e r n a te source of gas to supply the system needs. This is an under pressure protection requirement which can be dealt with by other regulator stations on the system sized to pick up this lost flow or a parall e l piping run of equal capacity regula tors to supply the load. This is under pressure protection

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