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Subcommittee on Aboveground Storage Tanks

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My Rosters

 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
David Clark, Buckeye Partners, L.P.

Active members, thank you for attending the API 2018 Spring Refining Equipment Standards Meeting.

The SCAST meets next during the 2018 Fall Refining Equipment Standards Meeting, November 12 - 15, at the Hyatt Regency Orlando Hotel, Orlando, Florida. Click on “Calendar of Events" under Links for meeting logistics and other information.


 Meeting Information

Folder: 2018 Spring Meeting2018 Spring

 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
4703ClosedIn Progress01/15/201903/08/2019620-2042 R0: Proposed New Annex Y, Membrane Component of Membrane Containment Tank Systems
4704ClosedIn Progress01/15/201903/08/2019620-2043 R0: Membrane Tank Outer Containers (Proposed Revisions to Annexes Q and R)
4705ClosedIn Progress01/15/201903/08/2019625-2005 R0: Membrane Tank Containment Systems
4733OpenIn Progress01/29/201903/15/2019Specification 12B, Bolted Tanks for Storage of Production Liquids, 17th Ed.
4724OpenIn Progress01/30/201903/18/2019620-2007 R8: 'Low-Stress/Low Temperature' Design Allowance Inclusion/Extension
4725OpenIn Progress01/30/201903/18/2019620-2039 R0: Determination of At-fault Welder
4726OpenIn Progress01/30/201903/18/2019620-2041 R0: Cryogenic Weld Metal Impacts in Annex Q
4727OpenIn Progress01/30/201903/18/2019625-2004 R3: Shell Manways for Each Storage Concept
4717OpenIn Progress01/30/201903/18/2019650-1044 R4: Sandwich Panel-API 650 Annex H2.2.f)
4718OpenIn Progress01/30/201903/18/2019650-1045 R1: Seismic Overturning at the Base of Each Shell Course
4719OpenIn Progress01/30/201903/18/2019650-1056 R3: Add Additional Automatic Level Gauge References in Annex C
4720OpenIn Progress01/30/201903/18/2019650-1074 R0: ASCE 7 Wind Update
4721OpenIn Progress01/30/201903/18/2019650-1080 R0: Calculation of Hydrodynamic Liquid Hoop Stress in the Corroded Condition
4722OpenIn Progress01/30/201903/18/2019650-1081 R0: Proper Application of Internal Pressure for Design Liquid Height
4723OpenIn Progress01/30/201903/18/2019650-1083 R1: Annex A Minimum Shell Thickness
4728OpenIn Progress01/30/201903/18/2019650-2035 R2: Welding After PWHT
4729OpenIn Progress01/30/201903/18/2019650-2046 R0: Organization and Wording for Opening PWHT
4730OpenIn Progress01/30/201903/18/2019650-2048 R0: Increase Permitted Pass Size for Plate over 1½ Inches Thick
4735OpenIn Progress02/07/201903/25/2019653-2024 R6: API-653 Inspection Checklist
4736OpenIn Progress02/08/201903/25/2019653-2029 R1: Clarify API 653 Section, External Inspection Intervals
4737OpenIn Progress02/08/201903/25/2019653-2030 R2: Clarify Scope of Section - Routine In-Service (Monthly) Inspections
4738OpenIn Progress02/08/201903/25/2019653-2031 R2: Tank Bottom Corrosion
4739OpenIn Progress02/08/201903/25/2019653-2035 R3: Authorization of Repair Work
4742OpenIn Progress02/12/201903/28/2019SCAST Technical Inquiries Ballot, Spring 2019
4749OpenIn Progress02/26/201903/29/2019Std. 2510, Design and Construction of LPG Installations, 9th Ed. Recirculation Ballot
4780OpenIn Progress03/19/201904/22/2019Std. 12R1 6th Ed., Intall, Operation, Maint., & Repair of Production Tanks Recirculation Ballot
4774OpenIn Progress03/18/201904/26/2019API RP 575, Inspection Practices for Atmospheric and Low-Pressure Storage Tanks, 4th Edition, Rev 6
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