API 620, Design and Construction of Large, Welded, Low-Pressure Storage Tanks, is a standard developed and published by the American Petroleum Institute that gives requirements for the design and construction of large, welded storage tanks with pressures in their gas or vapor spaces of not more than 15 lbf/in.2 gauge. This standard was originally published in 1956, with the most recent 12th Edition being released in October of 2013.

The rules presented in API 620 cannot cover all details of design and construction because of the variety of tank sizes and shapes that may be constructed. Where complete rules for a specific design are not given, the intent is for the Manufacturer, subject to the approval of the Purchaser's authorized representative, to provide design and construction details that are as safe as those which would otherwise be provided by this standard.

Related Topics

• API 560 - Fired Heaters for General Refinery Service
• API 579-1/ASME FFS-1 - Fitness-For-Service (FFS)
• API 594 - Check Valves: Flanged, Lug, Wafer, and Butt-Welding
• API 650 - Welded Tanks for Oil Storage
• API 660 - Shell-and-Tube Heat Exchangers
• API 661 - Petroleum, Petrochemical, and Natural Gas Industries Air-Cooled Heat Exchangers
• API RP 1173 - Pipeline Safety Management Systems
• API RP 1176 - Assessment and Management of Cracking in Pipelines
• API RP 538 - Industrial Fired Boilers for General Refinery and Petrochemical Service
• API RP 571 - Damage Mechanisms Affecting Fixed Equipment in the Refining Industry
• API RP 572 - Inspection of Pressure Vessels
• API RP 573 - Inspection of Fired Boilers and Heaters
• API RP 574 - Inspection Practices for Piping System Components
• API RP 575 - Inspection Practices for Atmospheric and Low Pressure Storage Tanks
• API RP 576 - Inspection of Pressure-Relieving Devices
• API RP 577 - Welding Processes, Inspection, and Metallurgy
• API RP 578 - Material Verification for New and Existing Alloy Piping
• API RP 580 - Risk Based Inspection (RBI)
• API RP 581 - Risk Based Inspection Technology
• API RP 583 - Corrosion Under Insulation and Fireproofing
• API RP 584 - Integrity Operating Windows
• API RP 585 - Pressure Equipment Integrity Incident Investigation
• API RP 651 - Cathodic Protection of Aboveground Petroleum Storage Tanks
• API RP 75 - Safety and Environmental Management System for Offshore Operations
• API RP 751 - Safe Operation of Hydrofluoric Acid Alkylation Units
• API RP 754 - Process Safety Performance Indicators for the Refining and Petrochemical Industries
• API RP 934 - Materials and Fabrication of Heavy Wall Pressure Vessels for High-Pressure Hydrogen Ser
• API RP 939-C - Guidelines for Avoiding Sulfidation (Sulfidic) Corrosion Failures in Oil Refineries
• API RP 941 - Steels for Hydrogen Service at Elevated Temperatures and Pressures
• API RP 970 - Corrosion Control Documents
• International Organization for Standardization (ISO)

Relevant Links

• API Standards Homepage
• Purchase Document

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