API Std 526
Flanged Steel Pressure Relief Valves, Fifth Edition
standard by American Petroleum Institute, 06/01/2002
Full Description
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; and center-to-face dimensions, inlet and outlet.