November 2018

Fluid Flow and Rotating Equipment

Understand API and ASME standards to prevent oversizing PSVs

If you have ever sized or selected a pressure safety relief valve (PSV) using vendor sizing programs or hand calculations, you have probably run into a strange anomaly.

Taylor, B., Anvil Corp.

If you have ever sized or selected a pressure safety relief valve (PSV) using vendor sizing programs or hand calculations, you have probably run into a strange anomaly: Why does a PSV orifice size change between American Petroleum Institute (API) and American Society of Mechanical Engineers (ASME) datasets? What is an “effective” orifice area? How can you know which standard to use when selecting a PSV? Usually, this issue is one of curiosity and does not affect the result of which valve is chosen. Common practice is to default to API sizing equations and parameters, and use only ASME datasets for situations outside of API letter designations. However, this approach is likely causing you to

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