API 653 Formulas

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1. Calcs - tmin for Shell LTA
• tmin = 2.6 HDG/SE
• H-from Bottom of LTA
• E=1.0 Away from WELD by greater of 1" or 2T
• E=1.0 Away from RIVET by >6"
• API 653 Section 4 - FFS
2. Calcs - tmin for Shell Course
• tmin = 2.6 (H-1)DG/SE
• H-from Bottom of LTA
• E - Chart
• API 653 Section 4 - FFS
3. Calcs - Hydro Height for shell
• Ht = S1Etmin/2.6D + 1
• tmin is tcurrent
• API 653 - Section 4 - FFS - Hydrotest
4. Calcs - Hydro Height for LTA
• Ht = S1Etmin/2.6D
• tmin is taverage
• API 653 - Section 4 - FFS - Hydrotest
5. Calcs- Min Future Bottom Thickness
• tfuture = tcurrent - I (CRtop + CRunder)
• I= Future insp interval
• CRtop = CR Top side
• CRunder = CR Btm Side
• API 653 - Section 4 - FFS - Min thickness of Tank Bottom Plate
6. Calcs - Max Interval based on Bottom Thickness
• I = tcurr - tmin / CRtop + CRunder
• tmin = either 0.100" or 0.050"
• API 653 - Section 4 - FFS - Min thickness of Tank Bottom Plate
7. Calcs - Critical length for LTA
• L = 3.7 x sq-root of (D x t2),
• Not more than 40 inches.
• T2 - least thickness in corroded area, excluding pits
• API 653 - Section 4 - Actual Thickness Determination
8. Calcs - LTA Acceptance Criteria
• t1 > tmin + (CR x I)
• t2 > 0.6tmin + (CR x I)
• API 653 - Section 4 - Actual Thickness Determination
9. Calcs - Min thickness at Pit
• trem > 0.5tmin
• Widely Scattered pits
• API 653 - Section 4 - Actual Thickness Determination
10. Calcs - Min Distance Hot tap to Exist Nozzle
• Ns > Sq-root of 6DT
• T = shell thickness in inches
• D = Shell Dia (Ft)
• API 653 - Section 9 - Hot Taps
11. Calcs - Hot Tap Hydro
• Ptest = 0.65 x H x G
• H - Btm of Noz to top of tank liquid.
• G= Gravity but not less than 1.0
• API 653 - Section 9 - Tank Repair and Alteration (9.14.5.3)
12. Calcs - Max out of Plumbnes
• P < (Hx12)/100
• API 653 - Section #10 -Dismantling and Reconstruction
13. Calcs - # of Settlement Points
• Greater of N=D/10 or 8
• API 653 - Annex B - Evaluation of Tank Bottom Settlement
14. Calcs - Internal Settlement or Bulges
• BB=0.37R
• API 653 - Annex B - Evaluation of Tank Bottom Settlement
15. Charts - Max Allowable Edge Settlement - Perpendicular to the Shell
API 653 - Annex B - Evaluation of Tank Bottom Settlement - Figure B.12
16. Charts - Max Allowable Edge Settlement - Parallel to the Shell
API 653 - Annex B - Evaluation of Tank Bottom Settlement - Figure B.11
17. Calcs - Min Diameter of the insert plate
• Greater of DNOZ x2 or D+12"
• API 653 - Section 9 - Tank Repair and Alteration
18. Calcs - Min Diameter of the insert plate when reinforcement plates are used
• Reinforcement Plate diameter + 12"
• API 653 - Section 9 - Tank Repair and Alteration
19. Calcs - Alternate tmin calc when tank shell is below min required - Sect VIII Div2 - FFS.  USE alternate Stress value - Formula
• < 2/3 Y & < 1/3 T - Use Orig Stress
• >2/3 Y or >1/3 T - Use lesser 2/3 Y or 1/3 T
• API 653 - Section 4 - FFS
20. Maximum Allowable Stress Table (Not for Use for Reconstructed Tanks)
API 653 - Section 4 - FFS - TABLE 4.1
21. Maximum Allowable Stress Table (Reconstructed Tanks)
API 650 - Section 5 - Design - Table 5.2
22. Joint Efficiencies for WELDED Joints - Table
API 653 - Section 4 - FFS - Table 4.2
23. Joint Efficiencies for RIVITED Joints - Table
API 653 - Section 4 - FFS - Table 4.3
24. Annular Bottom Plate thickness (G < 1) - Table
API 653 - Section 4 - FFS - Table 4.5
25. Annular Bottom Plate thickness (G > 1) - Table
API 650
26. Brittle Fracture Assessment - Temp/Thickness Exemption Curve
API 653 - Setion 5 - Brittle Fracture Consideration - Figure 5.2
27. Inspection Intervals - Table
API 653 - Section 6 - Inspection - Table 6.1
28. Acceptance Details for Replacement of Shell Plate Material - Shell Patches
API 653 - Section 9 - Design Considerations for Reconstructed Tanks - Figure 9.1
29. Shell Repairs using Lap Patches (Cover Holes, Reinforce Corroded Area, Cover Leaks)
API 653 - Section 9 - Tank Repair and Alteration
30. Repad Fillets - Reinforcing Plate - Figure
API 653 - Section 9 - Tank Repair and Alteration - Figure 9.8
31. Bottom Patches - Figure
API 653 - Section 9 - Tank Repair and Alteration - Figure 9.13
32. Edge Settlement - Maximum Allowable Edge Settlement for Areas with Bottom Lap Welds Approximately PARALLEL to the Shell - Figure
API 653 - Annex B - Evaluation of Tank Bottom Settlement - Figure B.11
33. Edge Settelment - Maximum Allowable Edge Settlement for Areas with Bottom Lap Welds Approximately PERPENDICULAR to the Shell - Figure
API 653 - Annex B - Evaluation of Tank Bottom Settlement - Figure B.12
34. Fitness for Service - Code & Section
API 653 - Section 4 - FFS
35. Design Consideration for Reconstructed Tanks - Code & Section
API 653 - Section 8
36. Tanks Repairs - Code & Section
API 653 - Section 9
37. Dismantling and Reconstruction - Code and Section
API 653 - Section 10
38. Examination and Testing - Code and Section
API 653 - Section 12 & Annex F
39. Evaluation of Tank Bottom Settlement - Code and Section
API 653 - Annex B
 Author: SamG ID: 265540 Card Set: API 653 Formulas Updated: 2014-03-08 16:18:13 Tags: API Folders: API Description: API 653 Exam Prep - Formulas Show Answers: