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 Subcommittee Scope

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:

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

SCPRS Chair:   Matt Brewer, BP
SCPRS Vice-Chair:   Eli Vatland Johansen, Equinor
API 520 Task Force Chair: Phil Henry, Equity Engineering
API 521 Task Force Chair: David Fenton, Exxon Mobile ​​
API 526-527 Task Force Chair: Thakor Patel
API 2000 Taskforce Co-Chairs: Kevin Campbell , Shell and Don Griglack,Phillips 66



 Open Ballots

 Ballot IDStatusResultsOpensClosesDescription
Committee ID : 439480SCPRS Subcommittee
4890ClosedResolution Required08/16/201909/27/2019API Std 520 Part II 7th edition Ballot 2
4900ClosedResolution Required08/28/201910/01/2019API Std 527 5th Ed Seat Tightness first ballot markup
4835ClosedResolution Required06/10/201910/04/2019Std. 537 (Flare Details) 3rd Edition, Addendum 1 Approval Ballot
4948ClosedResolution Required10/02/201911/01/2019API Std 2000 ballot item 12 LNG Tanks
4947ClosedResolution Required10/02/201911/01/2019API Std 2000 ballot item 15 Line Clearing
4949ClosedResolution Required10/02/201911/01/2019API Std 2000 ballot item 16 wet insulation
5057ClosedPass02/21/202003/20/2020Ballot to reaffirm Std. 2000, Venting Atmospheric and Low-pressure Storage Tanks
5073ClosedIn Progress02/28/202004/10/2020API 520 Part II 7Th Edition
5076ClosedIn Progress03/03/202004/10/2020Ballot to Review API 520 Part 2 Section 13.9
5423ClosedIn Progress03/05/202104/26/2021API 521 8th Ed Ballot 1 - Reballot of 7th Edition Unit Knockout Drum Ballot 6.9
5603OpenIn Progress09/21/202110/26/2021API 521 8th Ed Ballot 1 - 2nd Re-ballot of 7th Edition Unit Knockout Drum Ballot 6.9
Agenda API 526_527 Fall 2014.pdfAgenda API 526_527 Fall
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