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Subcommittee on Aboveground Storage Tanks

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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 2017 Fall Refining Equipment Standards Meeting.

The SCAST meets next during the 2018 Spring Refining Equipment Standards Meeting, April 16 - 19, at the Sheraton Seattle Hotel, Seattle, Washington. Click on ‚ÄúCalendar of Events" under Links for meeting logistics and other information.


 Meeting Information

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 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
4332OpenIn Progress01/16/201802/28/2018RP 651 (Cathodic Protection of ASTs) 4th Ed. SCAST Review & Comment
4333OpenIn Progress01/16/201802/28/2018RP 652 (Linings of AST Bottoms) 4th Ed. SCAST Review & Comment
4344OpenIn Progress01/29/201803/12/2018API RP 575, 4th Edition First Ballot
4348OpenIn Progress02/06/201803/23/2018650-1033 R0: Allow Top Wind Girder Used as Walkway to be Lower Than 42 Inches
4349OpenIn Progress02/06/201803/23/2018650-1044 R3: Sandwich Panel-API 650 Annex H2.2(f)
4350OpenIn Progress02/06/201803/23/2018650-1056 R1: Add Additional Automatic Level Gauge References in Annex C
4351OpenIn Progress02/06/201803/23/2018650-1069 R0: Move Definition of "Self Anchor" from Annex E to Section 3
4353OpenIn Progress02/06/201803/23/2018650-1078 R0: Cd Value in API 650 Annex E
4354OpenIn Progress02/06/201803/23/2018650-1079 R0: Supplementary Roof Drains
4355OpenIn Progress02/06/201803/23/2018653-1002 R0: Tank Bottom General Repair
4373OpenIn Progress02/14/201803/30/2018620-2028 R5: Welder ID Marking
4374OpenIn Progress02/14/201803/30/2018620-2031 R0: Revise PWHT Parameters in 6.18
4375OpenIn Progress02/14/201803/30/2018620-2034 R0: Tensile Range of CSA Steel
4376OpenIn Progress02/14/201803/30/2018650-1017 R6: Shell Manhole Flange Flatness and Roughness Tolerance
4377OpenIn Progress02/14/201803/30/2018650-2028 R5: Hydrotest Requirements in Annexes C & H
4378OpenIn Progress02/14/201803/30/2018650-2032 R5: Welder ID Marking
4379OpenIn Progress02/14/201803/30/2018650-2039 R0: Determination of At-fault Welder
4380OpenIn Progress02/14/201803/30/2018650-2041 R1: To Include PWHT Parameters in 5.7.4
4381OpenIn Progress02/14/201803/30/2018650-2043 R0: Cold Temperature Anchor Bolts
4382OpenIn Progress02/15/201804/02/2018653-2002 R4: Changes in Hot Tapping Requirements
4383OpenIn Progress02/15/201804/02/2018653-2020 R5: Welder ID Marking
4384OpenIn Progress02/15/201804/02/2018653-2023 R2: Required Thickness in Critical Zone
4385OpenIn Progress02/15/201804/02/2018653-2024 R3: API 653 Inspection Checklist
4386OpenIn Progress02/15/201804/02/2018653-2025 R0: API Group IV and Higher Special Requirements for Unknown Materials
4387OpenIn Progress02/15/201804/02/2018653-2026 R3: Non-metallic Tank Repairs
4388OpenIn Progress02/15/201804/02/2018653-2028 R2: Evaluation of Bottm Edge Projection
4389OpenIn Progress02/15/201804/02/2018653-2029 R0: Clarify API 653 Section External Inspection Intervals
4390OpenIn Progress02/15/201804/02/2018653-2036 R0: Clarify API-653 Section 9.9 Alteration of Existing Shell Penetrations
4370OpenIn Progress02/13/201804/02/2018SCAST Technical Inquiries Ballot, Spring 2018
4392OpenIn Progress02/16/201804/05/2018RP 2027 (Ignition Hazards & Safe Work Practices for ASTs) 4th Edition Reballot
4409OpenIn Progress02/23/201804/06/2018650-1070 R1: Minimum Annular Plate Width
4405OpenIn Progress02/21/201804/06/2018Spec. 12F, Shop Welded Tanks for Production Liquids, 13th Ed. Reballot
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