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Title: Fundamentals Of Monitor Regulators
Author: Richard J. Mooney
Source: 1995 Western Gas Measurement Short Course
Year Published: 1995
Abstract: Monitor regulation is a basic form of Over Pressure Protection (OPP) in the natural gas industry. The DOT code requires that whenever the flow of natural gas is being controlled from a system with a higher pressure rating (MAOP - Maximum Allowable Operating Pressure) to a system with a lower MAOP there must be at least one form of over pressure protection to prevent the system with the lower MAOP from being over pressurized. The three acceptable fomis of over pressure protection are:

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