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Title: Monitor Regulators
Author: Don Day
Source: 1984 Appalachian Gas Measurement Short Course
Year Published: 1984
Abstract: This paper is a general discussion of the philosophy behind the use of monitors for overpressure protection as well as an analysis of the types of equipment that can be used. Whenever a device is used to feed gas from a high pressure system to a low pressure system, there is always the possibility that the device will fail in a manner which will allow the pressure to go to a dangerously high level. We must always assume that the pressure regulator could fail in the wide open position. There are two popular methods of providing protection against overpressuring the system downstream of a failed regulator. One method is the simple installation of a properly sized reliefvalve however, thismethodisfalling into disfavor because a quantity of gas is lost whenever the relief valve operates. The other method is the use of a monitor regulator and this method is becoming more popular because no gas is lost.

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