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Sizing Api 521

Sizing Api 521

(OP)
Hi everyone, i have to size a safety valve using API 521. Do i have to follow the standard orifice table in API 526 (D, E, F, ecc.)? I'm not sure about that because over this table the standard says: "These effective areas are valid only when used with the sizing equations in API 520, Part I".

Thank you very much for your help

RE: Sizing Api 521

API521 describes scenarios to consider and offers methods to calculate the relief flow rate.
API520 gives the equations for assessing the orifice size required for a given flow rate.

The hard bit is assessing the credible relief scenarios. If this is your first time, it's worth getting some help from somrone who's done it before.

Matt

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