API 653 Formulas

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Author:
SamG
ID:
265540
Filename:
API 653 Formulas
Updated:
2014-03-08 11:18:13
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API
Folders:
API
Description:
API 653 Exam Prep - 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

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