API 620 : 2013

DESIGN AND CONSTRUCTION OF LARGE, WELDED, LOW-PRESSURE STORAGE TANKS

American Petroleum Institute

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1 Scope
2 References
3 Definitions
4 Materials
5 Design
6 Fabrication
7 Inspection, Examination and Testing
8 Marking
9 Pressure- and Vacuum-relieving Devices
Annex A (informative) - Inquiries and Suggestions
        for Change
Annex B (normative) - Use of Materials That are Not
        Identified with Listed Specifications
Annex C (informative) - Suggested Practice Regarding
        Foundations
Annex D (informative) - Suggested Practice Regarding
        Supporting Structures
Annex E (informative) - Suggested Practice Regarding
        Attached Structures (Internal and External)
Annex F (informative) - Examples Illustrating Application
        of Rules to Various Design Problems
Annex G (informative) - Considerations Regarding Corrosion
        Allowance and Hydrogen-induced Cracking
Annex H (informative) - Recommended Practice for Use of
        Preheat, Post-heat, and Stress Relief
Annex I (informative) - Suggested Practice for Peening
Annex J - (Reserved for Future Use)
Annex K (informative) - Suggested Practice for Determining
        the Relieving Capacity Required
Annex L (normative) - Seismic Design of Storage Tanks
Annex M (informative) - Recommended Scope of the
        Manufacturer's Report
Annex N (normative) - Installation of Pressure-relieving
        Devices
Annex O (informative) - Suggested Practice Regarding
        Installation of Low-pressure Storage Tanks
Annex P (informative) - NDE and Testing Requirements
        Summary
Annex Q (normative) - Low-pressure Storage Tanks for
        Liquefied Gases at -325 degrees F or Warmer
Annex R (normative) - Low-pressure Storage Tanks Operating
        Between +40 degrees F and -60 degrees F
Annex S (normative) - Austenitic Stainless Steel Storage Tanks
Annex SC (normative) - Stainless and Carbon Steel Mixed Materials
         Storage Tanks
Annex U (normative) - Ultrasonic Examination in Lieu of Radiography
Annex X (normative) - Duplex Stainless Steel Storage
        Tanks

Abstract

Describes large, field-assembled storage tanks of the type that contain petroleum intermediates (gases or vapors) and finished products, as well as other liquid products commonly handled and stored by the various branches of the industry.