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Subcommittee on Aboveground Storage Tanks

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 API Contact

Jose Godoy
Associate, Standards
American Petroleum Institute
200 Massachusetts Avenue, NW
Washington, DC 20001
Phone: 202-682-8073

 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: David Clark, Buckeye Partners L.P.
Todd McClellan, Colonial Pipeline Company

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

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