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Title: Safety Relief Valves
Author: Gary B. Emerson
Source: 1989 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1989
Abstract: Without going into the many specific formulas used in sizing safety relief valves, we will review the basis for various types of safety relief valve sizing situations. Recognizing that no one style of safety relief valve is suitable for all types of services, we will discuss the four basic types - weight loaded conventional direct spring operated balanced bellows, direct spring operated and pilot operated (piston type and diaphragm types) - and discuss various advantages, limitations, possible pitfalls, and specific applications of each. The basic purpose of a safety relief valve is to prevent system pressure from exceeding some predetermined limit, according to the service and applicable code. Normally the system pressure is not allowed to exceed the maximum allowable working pressure (MAWP) of the pressure vessel or pipe, plus an allowable overpressure.

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