May 2015

Process Engineering

Improve relief-device sizing under supercritical conditions

Properly sized relief devices under supercritical conditions are vital to processing natural gas and gas condensates into olefins. These processes operate near the critical locus of the process gases ..

Smith, D., Smith & Burgess LLC; Burgess, J., Smith and Burgess LLC

Properly sized relief devices under supercritical conditions are vital to processing natural gas and gas condensates into olefins. These processes operate near the critical locus of the process gases used. Relief-device sizing equations that are based on the nozzle flow equation in API 520 or ASME B&PVC Section I or VIII use the expansion of an ideal gas or a real gas.1, 2 Details of sizing equations Per API 520, if the compressibility factor of the fluid is greater than 0.8, then the ideal gas ratio of specific heats may be used to determine the expansion coefficient. If the compressibility factor is less than 0.8, then the expansion coefficient should be based on the isentropic expansi

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