API 650 : 2013+ADD 3 : 2018

1 Scope
2 Normative References
3 Terms and Definitions
4 Materials
5 Design
6 Fabrication
7 Erection
8 Methods of Examining Joints
9 Welding Procedure and Welder Qualifications
10 Marking
Annex A (normative) - Optional Design Basis for Small Tanks
Annex AL (normative) - Aluminum Storage Tanks
Annex B (informative) - Recommendations for Design and
        Construction of Foundations for Aboveground Oil Storage
        Tanks
Annex C (normative) - External Floating Roofs
Annex D (informative) - Inquiries and Suggestions for Change
Annex E (normative) - Seismic Design of Storage Tanks
Annex EC (informative) - Commentary on Annex E
Annex F (normative) - Design of Tanks for Small Internal
        Pressures
Annex G (normative) - Structurally-Supported Aluminum Dome
        Roofs
Annex H (normative) - Internal Floating Roofs
Annex I (normative) - Undertank Leak Detection and Subgrade
        Protection
Annex J (normative) - Shop-Assembled Storage Tanks
Annex K (informative) - Sample Applications of the
        Variable-Design-Point Method to Determine
        Shell-Plate Thickness
Annex L (normative) - API Standard 650 Storage Tank Data Sheet
Annex M (normative) - Requirements for Tanks Operating at Elevated
        Temperatures
Annex N (normative) - Use of New Materials That Are Not
        Identified
Annex O (normative) - Under-Bottom Connections
Annex P (normative) - Allowable External Loads on Tank Shell Openings
Annex R (informative) - References for Tanks in Non-petroleum Product
        Service
Annex S (normative) - Austenitic Stainless Steel Storage Tanks
Annex SC (normative) - Stainless and Carbon Steel Mixed Materials
         Storage Tanks
Annex T (informative) - NDE Requirements Summary
Annex U (normative) - Ultrasonic Examination in Lieu of Radiography
Annex V (normative) - Design of Storage Tanks for External Pressure
Annex W (normative) - Commercial and Documentation Recommendations
Annex X (normative) - Duplex Stainless Steel Storage Tanks
Annex Y (informative) - API Monogram

This standard establishes minimum requirements for material, design, fabrication, erection, and inspection for vertical, cylindrical, aboveground, closed- and open-top, welded storage tanks in various sizes and capacities for internal pressures approximating atmospheric pressure (internal pressures not exceeding the weight of the roof plates), but a higher internal pressure is permitted when additional requirements are met (see 1.1.13).