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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 2019 Spring Refining and Equipment Standards Meeting. 

The next API Refining Meeting is the 2019 Fall Refining and Equipment Standards Meeting is planned for November 18 - 22, 2019 at the Hyatt Regency Atlanta in Atlanta, Georgia.

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

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 Reference Documents
 Calendar of Events
 API Refining Meeting Information


 Ballot IDStatusResultsOpensClosesDescription
Committee ID : 677SCAST - Subcommittee on Aboveground Storage Tanks
4887ClosedResolution Required08/13/201909/24/2019API RP 575 4th Edition 3rd Ballot
4985ClosedResolution Required12/09/201901/20/2020Annex to 12 Series_ walkway and stairway system
4993ClosedResolution Required12/09/201901/20/2020TR 655 Volatile Corrosion Inhibitors- For Comment Only
5028ClosedResolution Required02/14/202003/27/2020API 620-2019 -F1 Rev1
5033ClosedResolution Required02/14/202003/27/2020API 620-2047 DEFINITION of “NOMINAL THICKNESS”
5032ClosedResolution Required02/14/202003/27/2020API 620-2048 PT used instead of Vacuum Box or Solution Film Test
5029ClosedResolution Required02/14/202003/27/2020API 620-2049 Rev 0
5031ClosedResolution Required02/14/202003/27/2020API 620-2054 Division of Responsibility
5030ClosedResolution Required02/14/202003/27/2020API-620-2051 Define Lowest One Day Mean Temperature Data
5037ClosedResolution Required02/18/202003/31/2020API 625-2006 Division of Responsibilities Rev3
5039ClosedResolution Required02/18/202003/31/2020API 625-2009 Define ambient temperature for the BOG calculation
5046ClosedResolution Required02/18/202003/31/2020API 650-1086 Add an annex for Lightning Protection
5040ClosedResolution Required02/18/202003/31/2020API 650-2018 clean up footnotes contained in API 650
5041ClosedResolution Required02/18/202003/31/2020API 650-2019 Inquiry on section bottom weld minimum spacing req.
5042ClosedResolution Required02/18/202003/31/2020API 650-2035 Welding After PWHT
5045ClosedResolution Required02/18/202003/31/2020API 650-2051 - Use of PT as a substitute for Vacuum Box
5043ClosedResolution Required02/18/202003/31/2020API 650-2052 To include PWHT Parameters in 5.7.4
5044ClosedResolution Required02/18/202003/31/2020API 650-2053 Definition of Manufacturer
5047ClosedResolution Required02/18/202003/31/2020API 653-2019 F2 Inquiries on section 4.4 & 9.10.1
5048ClosedResolution Required02/18/202003/31/2020API 653-2023 Required Thickness in Critical Zone
5049ClosedResolution Required02/18/202003/31/2020API 653-2031 Bottom Corrosion Agenda Item Rev 6
5051ClosedResolution Required02/20/202004/02/2020API 653-2037 Rev6 Section 6.4 Internal Inspection Intervals
5054ClosedResolution Required02/20/202004/02/2020API 653-2041 PT in lieu of Vacuum Box or Solution Film
5053ClosedResolution Required02/20/202004/02/2020API 653-2042 to include RBI in API 653 Section
5052ClosedResolution Required02/20/202004/02/2020API 653-2045 Rev1 Minimum Spacing Between New Plates and Existing Weld Seams
5059ClosedResolution Required02/25/202004/06/2020API 620-1020 Figure 5-1 Compressive Allowable Curve
5064ClosedResolution Required02/25/202004/06/2020API 650-1091 Define Self-Supported Roofs & Consolidate Participating Area Calc.
5065ClosedResolution Required02/25/202004/06/2020API 650-1093 External Floating Roof Bearing Plate Requirements
5066ClosedResolution Required02/25/202004/06/2020API 650-1094 Annex G Tanks - Wind Girders Designed as Open Roof Tank
5067ClosedResolution Required02/25/202004/06/2020API 650-1096 rev0 Minimum Thickness of Bolted Foam Dams
5060ClosedResolution Required02/25/202004/06/2020API 653-1002 Tank Bottom Patch Plate Thickness
5061ClosedResolution Required02/25/202004/06/2020API 653-1004 Rv0 Allowable tank settlement Requirements
5063ClosedResolution Required02/25/202004/06/2020API 653-1006 Location of Horizontal Weld Seam on Half Pad
5081ClosedResolution Required03/05/202004/10/2020Fall 2019 Inquiries passed to SCLB
Committee ID : 1869SCAST Refrigerated Tank Task Group (RTTG)
5151OpenIn Progress05/12/202006/23/2020FOR COMMENT ONLY 620-2037 Add High Manganese Cryogenic Steel to API 620, Annex Q
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