API 520 Part II Updates to the 3% Rule – Why All The Fuss?

by Philip A. Henry, P.E. / December 2015

 

It took 12 years, but the API Pressure Relieving Systems (PRS) Subcommittee finally published the long-awaited 6th Edition of API 520, Part II “Sizing, Selection, and Installation of Pressure Relieving Systems.” E2G’s Phil Henry has been the task force chairman of API 520 since 1996 and cannot remember any standard within the API PRS Subcommittee being so difficult to get published.

 

Why the Wait? – The new guidance related to the infamous 3% rule on inlet pressure drop to pressure relief valves (PRVs) has become a political and often times contentious debate between the industry pressure relief experts and the Occupation Health and Safety Administration (OSHA).

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