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Example calculation

Calculation of required flange bolting loads

considering additional piping loads

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

Input data

  Design code      
  Flange type      
  Gasket outside diameter   mm  
  Flange width (gasket outside)   mm  
  Flange lendth (gasket outside)   mm  
  Gasket contact width   mm  
  Effective pressure diameter   mm  
  Friction factor of seal      
 
  Operating Testing Assembly
  Gasket factor k0   mm
  Gasket factor k1   mm
  Minimum required value KD   MPa
  Maximum allowable value K   MPa
  Gasket factor m    
  Required gasket surface pressure y   MPa
  Allowable gasket surface pressure   MPa
  Minimum required bolting load   kN
  Maximum permissible bolting load   kN
  Inside pressure   bar
  Additional longitudinal force   kN
  Torsional moment   kN·m
  Bending moment components   kN·m
  Transversal force components   kN
 
   
 

Calculated results

  Operating Testing Assembly
  Gasket factor k0   mm
  Gasket factor k1   mm
  Minimum required value KD   MPa
  Maximum allowable value K   MPa
  Gasket factor m    
  Required gasket surface pressure y   MPa
  Allowable gasket surface pressure   MPa
  Minimum required bolting load   kN
  Maximum permissible bolting load   kN
 
 

Extreme bolt forces

  Minimum required bolting load   kN
  Maximum permissible bolting load   kN
 
 

Gasket pressures

  for minimum
required
bolting force
for maximum
permissible
bolting force
  Load case M    MPa
  Load case M + LM   MPa
  Load case M - LM   MPa
  Load case M + PT   MPa
  Load case M + PT + LT   MPa
  Load case M + PT - LT   MPa
  Load case M + LT   MPa
  Load case M - LT   MPa
  Load case M + PO   MPa
  Load case M + PO + LO   MPa
  Load case M + PO - LO   MPa
  Load case M + LO   MPa
  Load case M - LO   MPa
  min   MPa
  max   MPa
 

Load case description:

  Load case M    after bolt tightening
  Load case M + LM   bolting force plus positive external loads by assembly
  Load case M - LM   bolting force plus negative external loads by assembly
  Load case M + PT   bolting force plus testing pressure
  Load case M + PT + LT   bolting force plus testing pressure plus positive testing external loads
  Load case M + PT - LT   bolting force plus testing pressure plus negative testing external loads
  Load case M + LT   bolting force plus positive testing external loads
  Load case M - LT   bolting force plus negative testing external loads
  Load case M + PO   bolting force plus operating pressure
  Load case M + PO + LO   bolting force plus operating pressure plus positive operating external loads
  Load case M + PO - LO   bolting force plus operating pressure plus negative operating external loads
  Load case M + LO   bolting force plus positive operating external loads
  Load case M - LO   bolting force plus negative operating external loads

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