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Example calculation

Assessment of General and Local Metal Loss in Cylindrical Shells

according to API 579 Fitness-For-Service Part 4

Attention!
This calculation is only a simplified estimation, and does not replace a detailed design calculation.

Input data

  Outside diameter of the shell Do mm
  Nominal thickness of the component adjusted for mill undertolerance tnom mm
  Minimum required shell thickness based on the stresses in the circumferential direction tCmin mm
  Minimum required shell thickness based on the stresses in the longitudinal direction tLmin mm
  Future corrosion allowance FCA mm
  Maximum length of thickness averaging in longitudinal direchtion Ls mm
  Maximum length of thickness averaging in circumferential direchtion Lc mm
  Longitudinal spacing of thickness readings LsL mm
  Circumferential spacing of thickness readings LsC mm
  Uniform thickness away from the local metal loss location established by thickness measurements at the time of the assessment trd mm
  Thickness readings data table with rows in longitudinal direchtion   mm
 
   
 

Results

  Minimum measured thickness tmm mm
  Coefficient of variation COV %
  Average measured wall thickness tam mm
  Length of thickness averaging in longitudinal direchtion Ls mm
  Length of thickness averaging in circumferential direchtion Lc mm
  Average measured wall thickness based on the longitudinal critical profile tsam mm
  Average measured wall thickness based on the circumferential critical profile tcam mm

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