API 327 : 1994

ABOVEGROUND STORAGE TANK STANDARDS: A TUTORIAL

American Petroleum Institute

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1.0 INTRODUCTION AND SCOPE
2.0 SUMMARY OF PROCEDURES
     2.1: LOGIC DIAGRAM FOR TANK DESIGN & EVALUATION
     2.2: LOGIC DIAGRAM FOR BOTTOM EVALUATION
     2.3: LOGIC DIAGRAM FOR SHELL EVALUATIONS
3.0 BASIC DATA REQUIREMENTS
     FIGURE 3.0 - HIGH PRIORITY DATA
4.0 BOTTOM SELECTION
     Case 1 - Basic Design Data for 150,000 BARREL API
              STD 650 Tank
     Case 2 - Basic Design Data for 10,000 BARREL
              Gasoline Storage Tank
     Case 3 - Basic Design Data for 500 BARREL
              Production Fluid Tank
     Example 4.1 - Ground/Bottom Contact - 150,000
                   Barrel Tank
     Example 4.2 - Ground/Bottom Contact - 10,000
                   Barrel Gasoline Tank
     Example 4.3 - Ground/Bottom Contact - 500 Barrel
                   Production Tank
     Example 4.4 - Cathodically Protected Bottom

     Example 4.5 - Leak Detection/Containment System
     Example 4.6 - Leak Detection/Containment System
     Example 4.7 - Internal Bottom Lining
     Example 4.8 - Internal Bottom Lining and Cathodic
                   Protection
5.0 INSPECTION
     FIGURE 5.1
     FIGURE 5.2
6.0 BOTTOM FLAWS
     FIGURE 6.1
     Example 6.1 - Bottom Settlement
     Example 6.2 - Bottom Corrosion
7.0 SHELL EVALUATION
     Example 7.1 - Minimum Shell or Ring Thickness
     Example 7.2 - Risk of Brittle Fracture
Appendix A
Appendix B
Appendix C
Appendix D
Appendix E
Appendix F
Appendix G
Appendix H

Abstract

Presents procedures and examples to help designers, owners and operators of aboveground storage tanks understand and comply with API's Recommended Practices, Standards and Specifications concerning leak prevention. These API documents provide requirements designed to minimize environmental hazards associated with spills and leaks. The tutorial also shows how the API inspection and maintenance requirements influence the design of such tanks. It does not attempt to address additional rules and requirements imposed by individual jurisdictions or states.