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Title: Introduction To Overpressure Protection
Author: Robbie Swigert
Source: 2017 Western Gas Measurement Short Course
Year Published: 2017
Abstract: he scope of this paper is to cover methods available to prevent over - pressurization of downstream piping including 49 CFR Part 192 code requirements. Three Primary Modes of Regulator Failure Blocked orifice: Debris becomes lodged between the orifice and valve seat not allowing the regulator to lock up. Lever disconnect: The regulators lever becomes disconnected from the sensing element (diaphragm) taking away the regulators ability to regulate. Cut valve seat/nicked orifice: Usually caused by particles in the gas hitting the valve seat or orifice and actually cutting the material.

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