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API STD 526 2009 PDF

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API STD 526   FLANGED STEEL PRESSURE RELIEF VALVES

Revision / Edition:6    Chg:     Date: 04/00/09

Document Abstract
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.

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