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Subcommittee on Aboveground Storage Tanks

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 API Contact

Nate Wall
Senior Associate, Standards
American Petroleum Institute
1220 L Street, NW
Washington, DC 20005-4070
Phone: 202-682-8157

 Subcommittee Scope

Welcome to the API Subcommittee on Aboveground Storage Tanks (SCAST) web page. SCAST provides an important service to the refining, marketing, pipeline and petrochemical industry by developing recommended practices and construction, inspection and repair standards for aboveground storage tanks. In addition to the petroleum industry, API's tank standards are also used in the pulp and paper, utilities, food processing, fertilizer, and other process-related industries. SCAST's portfolio of standards includes:

  • Std 620 - Design and Construction of Large, Welded, Low-Pressure Storage Tanks
  • Std 625 - Tank Systems for Refrigerated Liquefied Gas Storage
  • Std 650 - Welded Tanks for Oil Storage
  • RP 651 - Cathodic Protection of Aboveground Storage Tanks
  • RP 652 - Lining of Aboveground Petroleum Storage Tank Bottoms
  • Std 653 - Tank Inspection, Repair, Alteration, and Reconstruction
  • Spec 12B - Specification for Bolted Tanks for Storage of Production Liquids
  • Spec 12D - Specification for Field Welded Tanks for Storage of Production Liquids
  • Spec 12F - Specification for Shop Welded Tanks for Storage of Production Liquids
  • Spec 12P - Specification for Fiberglass Reinforced Plastic Tanks
  • RP 12R1 - RP for Setting, Maintenance, Inspection, Operation, and Repair of Tanks in Production Service
  • Std 2015 - Requirements for Safe Entry and Cleaning of Petroleum Storage Tanks
  • RP 2016 - Guidelines and Procedures for Entering and Cleaning Petroleum Storage Tanks
  • Publ 2026 - Safe Access/Egress Involving Floating Roofs of Storage Tanks in Petroleum Service (SCAST document as of 2013)
  • RP 2027 - Ignition Hazards and Safe Work Practices for Abrasive Blasting in Petroleum Service (SCAST document as of 2013)
  • RP 2207 - Preparing Tank Bottoms for Hot Work (SCAST document as of 2013)
  • Std 2510 - Design and Construction of LPG Installations (SCAST document as of 2013)
  • Std 2610 - Design, Construction Operation, Maintenance, and Inspection of Terminal and Tank Facilities

These standards draw from a synergy of a high level of technical expertise and a long history of experience. The tank standards benefit owner/operators by providing the perspective and experience of other companies. Small companies gain expertise that would not be practically available otherwise. All companies benefit from proactively following industry standards developed using API's consensus process.

Chair: Hally Cooper, Alyeska Pipeline Service Company
Vice-Chair: David Clark, Buckeye Partners, L.P.

Active members, thank you for attending the API 2016 Fall Refining Equipment Standards Meeting.

The SCAST meets next during the 2017 Spring Refining Equipment Standards Meeting, May 8 - 11, at Caesars Palace, Las Vegas, NV. Click on ‚ÄúCalendar of Events" under Links for meeting logistics and other information.


 Meeting Information

Folder: 2017 Spring CRE Refining Equipment SCAST Standards Meeting2017 Spring CRE Refining Equipment SCAST Standards

 Technical Interpretations

Folder: Answered Technical Inquiries - by StandardAnswered Technical Inquiries - by


  Reference Documents
  Calendar of Events
  API Refining Meeting Information


 Ballot IDStatusResultsOpensClosesDescription
Committee ID : 677SCAST - Subcommittee on Aboveground Storage Tanks
4033ClosedIn Progress01/05/201702/20/2017SCAST Technical Inquiries for Ballot, Spring 2017
4040ClosedIn Progress01/18/201703/03/2017620-2026, Rev. 0: Purge Gas Containers Bottom Lap Weld Annex Q (Para Q.4.1) and R
4041ClosedIn Progress01/18/201703/03/2017620-2028, Rev. 1: Welder ID Marking
4042ClosedIn Progress01/18/201703/03/2017650-1017, Rev. 5: Figure 5-7a, Shell Manhole Flange Flatness and Roughness Tolerance
4043ClosedIn Progress01/18/201703/03/2017650-2018, Rev. 2: Cleanup of Footnote Issues
4044ClosedIn Progress01/18/201703/03/2017650-2024, Rev. 5: Painting and Coating Prior to Hydostatic Testing
4045ClosedIn Progress01/18/201703/03/2017650-2032, Rev. 1: Welder ID Marking
4046ClosedIn Progress01/18/201703/03/2017653-2018, Rev. 1: Credit in Table 6.1 for Release Prevention Barrier
4047ClosedIn Progress01/18/201703/03/2017653-2020, Rev. 1: Welder ID Marking
4048ClosedIn Progress01/18/201703/03/2017653-2021, Rev. 1: Clarify Cross-Reference on Welding to Existing Shell HAZ in Reconstructed Tanks
4056ClosedIn Progress01/28/201703/14/2017653-2022, Rev. 0: Temporary and Permanent Attachments to Shell Plates
4072ClosedIn Progress02/23/201704/10/2017620-1007, Rev. 0: Update Anchorage Design Rules in API 620
4073ClosedIn Progress02/23/201704/10/2017650-1020, Rev. 2: Clarify Use of Wind Moment Mw in Annex F and Check References
4074ClosedIn Progress02/23/201704/10/2017650-1026, Rev. 2: Thickness of Bottom Transition Plate, ta
4075ClosedIn Progress02/23/201704/10/2017650-1040 Rev. 1: Platform Loads on Self-supporting Roofs
4076ClosedIn Progress02/23/201704/10/2017650-1044 Rev. 1: Sandwich Panel Annex H2.2.f)
4077ClosedIn Progress02/23/201704/10/2017650-1054 Rev. 0: Clarification of Low-type Repad Welds
4078ClosedIn Progress02/23/201704/10/2017650-1055 Rev. 1: Annex G Reference Standards for Allowable Stress for Aluminum and SS Fasteners
4079ClosedIn Progress02/23/201704/10/2017650-1060 Rev. 0: Annex P Yc Correction
4080ClosedIn Progress02/23/201704/10/2017650-1067 Rev. 0: Clarify Minimum Shell Thickness Required for Frangibility
4081ClosedIn Progress02/23/201704/10/2017653-1005 Rev. 0: Door Sheet Stiffening, Section 9.2.4
Committee ID : 1290Task Force on RP 545
4054ClosedIn Progress01/27/201703/10/2017API RP 545, RP for Lightning Protection of Aboveground Storage Tanks
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