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Subcommittee on Pressure Relieving Systems

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Welcome to the home page of the API Subcommittee on Pressure-Relieving Systems (SCPRS).  The SCPRS develops standards and recommended practices covering the sizing, selection, and installation of pressure-relief devices used to protect unfired pressure vessels in the refining and petrochemical industries.  The SCPRS also establishes venting requirements for aboveground and underground liquid petroleum storage tanks.  Each meeting of the committee provides a forum for an information exchange on problems and opportunities where industry experts share experiences from operations around the world.

The SCPRS work program of documents includes:

  • RP 520 - Sizing, Selection, and Installation of Pressure-Relieving Devices in Refineries
    Part I - Sizing and Selection
    Par II - Installation
  • Std 521 - Guide for Pressure-Relieving and Depressuring Systems
  • Std 526 - Flanged Steel Pressure Relief Valves
  • RP 527 - Seat Tightness of Pressure Relief Valves
  • Std 2000 - Venting Atmospheric and Low-Pressure Storage Tanks (Nonrefrigerated and Refrigerated)  


Thank you for attending the API 2015 Fall Refining and Equipment Standards Meeting.  

The next API Refining Meeting is the 2016 Spring Refining and Equipment Standards Meeting planned for May 16 - 19, 2016 at the Hyatt Regency Chicago, in Chicago, Illinois. 

Click on “Calendar of Events" under Links for meeting logistics and other information.



 Meeting Materials

Folder: 2012 - Fall2012 -
Folder: 2012 - Spring2012 -
Folder: 2011 - Fall2011 -
Folder: 2011 - Spring2011 -
Folder: 2010 - Fall2010 -
Folder: 2010 - Spring2010 -
Folder: 2008 - Fall2008 -
Folder: 2008 - Spring2008 -
Folder: 2009 - Spring2009 -
Folder: 2009 - Fall2009 -

 Committee Documents - Public Access

Folder: API 520API
Folder: API 2000API


  Reference Documents
  Calendar of Events
  API Refining Meeting Information

 Open Ballots

 Ballot IDStatusResultsOpensClosesDescription
Committee ID : 439SCPRS
3969OpenIn Progress09/16/201610/28/2016API Std. 521, 7th Edition Ballot 3 items
3973OpenIn Progress09/26/201611/03/2016API Std 520 Part I 10th Edition - Fall 2016 Ballot Items
3972OpenIn Progress09/26/201611/03/2016Std. 520 Part II 7th Edition Fall 2016 Ballot Items
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