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 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

Thank you for attending the API 2020 Spring Refining and Equipment Standards Virtual Meeting. 

The next API Refining Meeting is the 2021 Fall Refining and Equipment Standards Meeting is planned for November 15 - 18, 2021 at the Hyatt Regency Orlando, Orlando Florida.

Click on “Calendar of Events" under Links for meeting logistics and other information.

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Folder: Draft DocumentsDraft
Folder: Ballot Results and CommentsBallot Results and
Folder: Group InformationGroup
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Folder: Std 656Std
Folder: Final Report on Out–of–Plane Tank Settlement, Equity EngineeringFinal Report on Out–of–Plane Tank Settlement, Equity
Folder: Tank Documents Publication PlanTank Documents Publication
Folder: Std 653Std
Folder: Std 650Std
Folder: Std 620Std
API Style Manual - 2020 Edition.pdfAPI Style Manual - 2020
(More Documents...)
Folder: Fall 2020 Ballot ResultsFall 2020 Ballot
Folder: New folderNew
Folder: 2014 Spring Ballot Results2014 Spring Ballot
Folder: 2013 Fall Ballot Results2013 Fall Ballot
Folder: 2012 Fall Ballot Results2012 Fall Ballot
Folder: 2013 Spring Ballot Results2013 Spring Ballot
Folder: 2012 Spring Ballot Results2012 Spring Ballot
Folder: RBI Ballot Results only - Fall 2011RBI Ballot Results only - Fall
Folder: 2011 Fall Ballot Results2011 Fall Ballot
Folder: 2011 Spring Ballot Results2011 Spring Ballot
Folder: Agenda Item Tracking SpreadsheetAgenda Item Tracking
(More Documents...)
2020 API Storage Tank Conference Program - Final .pdf2020 API Storage Tank Conference Program - Final
Folder: Answered Technical Inquiries - by StandardAnswered Technical Inquiries - by
 Reference Documents
 Calendar of Events
 API Refining Meeting Information


 Ballot IDStatusResultsOpensClosesDescription
Committee ID : 677812SCAST - Subcommittee on Aboveground Storage Tanks
5347ClosedIn Progress11/20/202002/09/2021Annex E Walkways and Stairways
5349ClosedIn Progress12/01/202003/11/2021API 625-1008 FOR COMMENT ONLY- Consider Prior SSE Effects on Post-SSE Design of SeConcondary tainers & Membrane Outer Containers
5378ClosedIn Progress01/28/202103/22/2021TR 655 Final Document for Comment Only
5387ClosedIn Progress02/11/202103/27/2021API 620-2050 Impact Tests for Annex R & Q Product Temperature Materials
5388ClosedIn Progress02/11/202103/27/2021API 620-2054 : Division of Responsibility
5389ClosedIn Progress02/11/202103/27/2021API 650-2035 :Welding After PWHT
5390ClosedIn Progress02/11/202103/27/2021API 650-2057 : Revise RT Requirements for Removable Backup Bars on Annular Plate Welds
5399ClosedIn Progress02/16/202103/30/2021Inquiry 650-2020-F1
5404ClosedIn Progress02/18/202104/01/2021Inquiry 653-2020-F2 rev 0
5434ClosedIn Progress03/15/202105/02/2021API 620-1016 Rev 0 Single Lap Weld Efficiency
5435ClosedIn Progress03/15/202105/02/2021API 620-1019 Reconciliation of various pressure terms
5436ClosedIn Progress03/15/202105/02/2021API 625-1009 Rev 0 Reconciliation of various pressure terms
5438ClosedIn Progress03/15/202105/02/2021API 650-1085 R1_Scaffold Cable Support Modification
5437ClosedIn Progress03/15/202105/02/2021API 650-1086 Lightning Protection Annex 2020 12 01
5439ClosedIn Progress03/15/202105/02/2021API 650-1092 Backing Bar Foundation Notches R0
5442ClosedIn Progress03/16/202105/02/2021API 650-1095 Wind Girder Update 2020 10 11
5443ClosedIn Progress03/16/202105/02/2021API 650-1101 - Lifting Lugs
5457ClosedIn Progress03/29/202105/11/2021API 650 Annex E Change Proposal
5488ClosedIn Progress06/03/202107/15/2021API 12F Project - Phase 4 - Final Report- FOR COMMENT ONLY-
5495ClosedIn Progress06/07/202109/09/2021API 12P 5th Edition
5587ClosedIn Progress09/13/202110/25/2021API 620-2048 PT used instead of Vacuum Box or Solution Film Test
5588ClosedIn Progress09/13/202110/25/2021API 620-2056 PWHT Temperature
5589ClosedIn Progress09/13/202110/25/2021API 620-2057 Add EN 10025 and ISO 630 Grade S355 Structural
5590ClosedIn Progress09/14/202110/26/2021API 650-2021 F2 Radiograph requirements at openings
5591ClosedIn Progress09/14/202110/26/2021API 650-2021 F3 Shell-to-Bottom Fillet weld - Scope of NDE
5592ClosedIn Progress09/14/202110/26/2021API 650-2028 REV 7 Hydrotest requirements in Annex C&H
5593ClosedIn Progress09/14/202110/26/2021API 650-2051 Rev 1 PT used instead of Vacuum Box
5594ClosedIn Progress09/14/202110/26/2021API 650-2055 Vacuum Box Sequence
5595ClosedIn Progress09/14/202110/26/2021API 650-2058 Rev1 Clarify temperature controls during PWHT
5596ClosedIn Progress09/14/202110/26/2021API 650-2059 Clarify Welding over Protective Coatings in Section
5597ClosedIn Progress09/14/202110/26/2021API 650-2060 Rev 0 Add EN 10025 and ISO 630 Grade S355 Structural
5598ClosedIn Progress09/14/202110/26/2021API 650-2063 Annex S Nozzle Weld Spacing
5489ClosedIn Progress06/03/202110/29/2021API RP 2026 4th Edition Revision
5558ClosedIn Progress08/09/202110/29/2021API RP 2207 Preparing Tank Bottoms for Hot Work
5579ClosedIn Progress09/10/202110/31/2021API 653-2021 F1 RT of welds around inserts or thickened inserts with penetrations
5580ClosedIn Progress09/10/202110/31/2021API 653-2021 F2 Extent of radiography at weld repairs in door sheet reinstallation
5581ClosedIn Progress09/10/202110/31/2021API 653-2041 Rev 1 PT in lieu of Vacuum Box or Solution Film
5583ClosedIn Progress09/10/202110/31/2021API 653-2044 Friction Stud Welding for Bolted-On Retrofits and Repairs
5584ClosedIn Progress09/10/202110/31/2021API 653-2051 Limited Ext of Bottom Svc Interval After Non-Complying Rob Insp Results
5585ClosedIn Progress09/10/202110/31/2021API 653-2052 Bottom Corrosion Repair Methods
5619ClosedIn Progress10/01/202111/08/2021API 650-1090 Agenda Item Steel Pan Updates Revision 0
5625ClosedIn Progress10/01/202111/09/2021API 650-1045 Seismic Overturning at the Base of Each Shell Course
5630ClosedIn Progress10/06/202111/09/2021API 650-1085 R2 Scaffold Cable Support
5620ClosedIn Progress10/01/202111/09/2021API 650-1092 Backing Bar Foundation Notches R2
5621ClosedIn Progress10/01/202111/09/2021API 650-1095 Wind Girder Update
5622ClosedIn Progress10/01/202111/09/2021API 650-1099 Manway Handles
5623ClosedIn Progress10/01/202111/09/2021API 650-1103 Annex I
5609ClosedIn Progress09/28/202111/09/2021API 651 Cathodic Protection of AST
5624ClosedIn Progress10/01/202111/09/2021API 653-1007 Rev 0 Corrections to Table 4.2
5626ClosedIn Progress10/01/202111/09/2021INQ-620-D007
5627ClosedIn Progress10/01/202111/09/2021INQ-650-D134
Committee ID : 18691571SCAST Refrigerated Tank Task Group (RTTG)
5497ClosedIn Progress06/08/202106/29/2021RTTG Survey on possible API 620 provisions
5539ClosedIn Progress07/21/202108/25/2021API 620-1010 Update Anchor Strap Design Guidance for Cold Storage Tanks Q & R REV-B
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