An Unfinished Chapter

An Unfinished Chapter

Philip A. Henry, P.E.

The inlet pressure drop rule is designed to protect pressure relief valves (PRVs) from instability; however, recent changes to API 520 allow the pressure drop to go above 3% of the set pressure if a supplementary engineering analysis is completed. This article, published in the September 2021 issue of World Fertilizer, discusses the improvements to the API codes and standards and how those changes impact the 3% rule.

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