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About This Item

 

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;
  • center-to-face dimensions, inlet and outlet.


Nameplate nomenclature and requirements for stamping are detailed in Annex A.
 

Document History

  1. API Std 526


    Flanged Steel Pressure-relief Valves, Eighth Edition

    • Most Recent
  2. API Std 526


    Flanged Steel Pressure-relief Valves, Seventh Edition, Includes Errata 1 (2018)

    • Historical Version
  3. API Std 526

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    viewing


    Flanged Steel Pressure-relief Valves, Sixth Edition (Includes Errata 1, Errata 2)

    • Historical Version
  4. API Std 526


    Flanged Steel Pressure Relief Valves, Fifth Edition

    • Historical Version
  5. API 526


    Flanged Steel Pressure Relief Valves

    • Historical Version
 

Amendments, rulings, supplements, and errata

  1. API Std 526 Errata 2

    Free
    Download


    Errata 2 to Flanged Steel Pressure Relief Valves, Fifth Edition, Includes Errata (May 2009), Errata 2 (Oct 2012)

  2. API Std 526 Errata

    Free
    Download


    Errata for Flanged Steel Pressure-relief Valves, Sixth Edition