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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 2017 Spring Refining Equipment Standards Meeting.

The SCAST meets next during the 2017 Fall Refining Equipment Standards Meeting, November 13 - 16, at the Hyatt Regency Dallas at Reunion, Dallas, TX. Click on “Calendar of Events" under Links for meeting logistics and other information.


 Meeting Information

Folder: 2017 Fall Refining Equipment SCAST Standards Meeting2017 Fall Refining Equipment SCAST Standards
Folder: 2017 Spring Refining Equipment SCAST Standards Meeting2017 Spring 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
4156ClosedIn Progress07/25/201709/15/2017620-1008 R0: Flush Type Shell Connection Bottom Reinforcing Plate
4157ClosedIn Progress07/25/201709/15/2017620-1009 R0: Revise Wind Girder Formulas for Better Transparency
4158ClosedIn Progress07/25/201709/15/2017650-1056 R0: Add Additional Automatic Level Gauge References in Annex C
4159ClosedIn Progress07/25/201709/15/2017650-1059 R0: Eliminate the by Weight Ordering Basis for Steel Plate
4160ClosedIn Progress07/25/201709/15/2017650-1061 R0: Trimming of Chime Near Anchor Bolts
4161ClosedIn Progress07/25/201709/15/2017650-1062 R0: Clarify Wind Uplift Anchor Load
4162ClosedIn Progress07/25/201709/15/2017650-1063 R0: Revise Wind Girder Formulas in Section 5.9.6 and 5.9.7 for Better Transparency
4163ClosedIn Progress07/25/201709/15/2017650-1066 R0: Annex F - Add a New Compression Ring Option
4164ClosedIn Progress07/25/201709/15/2017650-1068 R0: Bring Annex V and Wind Safety Factor Into Alignment
4165ClosedIn Progress07/25/201709/15/2017650-1071 R0: Wind Load Correction 5.2.1 (k), 5.9.6, and 5.9.7
4166ClosedIn Progress07/25/201709/15/2017650-1072 R0: Update Platform, Walkway, and Stairway Requirements per OSHA 1910.25, .28, and .29
4225ClosedIn Progress08/08/201709/22/2017SCAST Technical Inquiries Ballot, Fall 2017
4168ClosedIn Progress08/15/201709/29/2017620-2027 R1: Clarify Q.6.6.4 and R.5.6.4–Leak Testing
4169ClosedIn Progress08/14/201709/29/2017620-2028 R3: Welder ID Marking
4170ClosedIn Progress08/14/201709/29/2017620-2029 R0: Explain Material Toughness Requirements in Annexes Q and R
4171ClosedIn Progress08/14/201709/29/2017620-2030 R0: Simulated PWHT on Material Coupons for Annex R and Q
4172ClosedIn Progress08/14/201709/29/2017625-2003 R0: Explain Material Toughness Requirements in Annexes Q and R
4174ClosedIn Progress08/14/201709/29/2017650-2012 R5: Grouting Under Tank Bottoms
4175ClosedIn Progress08/14/201709/29/2017650-2023 R0: Additional Grades of A841
4176ClosedIn Progress08/14/201709/29/2017650-2024 R7: Painting and Coating Prior to Hydostatic Testing
4177ClosedIn Progress08/14/201709/29/2017650-2032 R3: Welder ID Marking
4173ClosedIn Progress08/14/201709/29/2017650-749 R6: Examination of Joints above Test Water Level
4178ClosedIn Progress08/28/201710/16/2017650-2034 R1: Tensile Range of CSA Steel
4179ClosedIn Progress08/28/201710/16/2017650-2036 R0: Move all WPQ Info on Coatings Into Section 9
4180ClosedIn Progress08/28/201710/16/2017650-2037 R0: Add ISO 9712 NDE Qualification/Certification Reference
4197ClosedIn Progress08/28/201710/16/2017650-2038 R1: Permit Non-metallic Materials in Platforms, Stairways and Walkways
4198ClosedIn Progress08/28/201710/16/2017650-2040 R0: Tank Bottom Elevation Readings
4199ClosedIn Progress08/28/201710/16/2017653-2002 R2: Change in Hot Tapping Requirements
4200ClosedIn Progress08/29/201710/16/2017653-2018 R2: Clarity the Example in Table 6.1 for Release Prevention Barriers
4201ClosedIn Progress08/29/201710/16/2017653-2020 R3: Welder ID Marking
4202ClosedIn Progress08/29/201710/16/2017653-2024 R1: API-653 Inspection Checklist
4203ClosedIn Progress08/29/201710/16/2017653-2026 R1: Non-metallic Tank Repairs
Committee ID : 1290Task Force on RP 545
4228OpenIn Progress08/11/201709/20/2017API RP 545 First Edition, Reaffirmation
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