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Title: Overpressure Protection Methods
Author: Mark Toman
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
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 distribution piping system. The regulator has a history of very reliable service, but because it is mechanical it can fail. A regulator can fail in two worst case conditions, wide open or fully closed. The fully closed regulator failure requires an alternate 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 parallel piping run of equal capacity regulators to supply the load. This is under pressure protection.

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