November 2010

Special Report: Plant Safety and Environment

Designing the correct pressure-relieving system

Use these relief rate calculations for gas thermal expansion as a cause for overpressure

Mofrad, S. Rahimi, Petrofac Engineering and Construction

cooling water The first step in designing a pressure-relieving system is to specify all possible causes of overpressure that is applicable to different equipment. The American Petroleum Institute (API) standard 5211 introduces the various emergency cases and general guidelines for calculating relief rates. While liquid thermal expansion is widely recognized as causing overpressure, gas thermal expansion is rarely taken as a credible cause of overpressure. Standard guidelines may be absent or it may be believed that gas thermal expansion has negligible contribution to overpressure. As a general practice for liquid thermal expansion, thermal relief valves (TRVs) are normally provided for equ

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