API 526 pdf download.Flanged Steel Pressure Relief Valves 2 Design 2.1 GENERAL Pressure relief valves discussed in this standard shall be designed and manufactured in accordance with the applicable requirements of Section VIII of the ASME Boiler and Pres- sure Vessel Code for pressure relief devices. 2.2 DETERMINATION OF EFFECTIVE ORIFICE AREA The minimum required effective oriÞce area shall be...