API Std 526
Flanged Steel Pressure-relief Valves, Seventh Edition, Includes Errata 1 (2018)
standard by American Petroleum Institute, 09/01/2017
Full Description
Please note that any addenda or errata may not be included in translated editions of this standard.This standard is a purchase specification for flanged steel pressure-relief valves. Basic requirements are given for direct spring-loaded pressure-relief valves and pilot-operated pressure-relief valves as follows:
orifice designation and area;
valve size and pressure rating, inlet and outlet;
materials;
pressure-temperature limits;
center-to-face dimensions, inlet and outlet.
Nameplate nomenclature and requirements for stamping are detailed in Annex A.