Stresses in membrane walls

according to german norm stress analysis


Attention!

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


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Input data
 Name   Value   Unit 
Geometry:
Inner radius of the tube ri mm
Outer radius of the tube ra mm
Tube pitch of the membrane wall t mm
Thickness of the fin sF mm
Material properties:
Material name  
Design temperature Td °C
Elasticity modulus E N/mm²
Poisson's ratio ν  
Coefficient of thermal expansion βi µm/m/K
Allowable stress Sm N/mm²
Loadings:
Inside pressure pi bar
Temperature at the Point 1 θ1 °C
Temperature at the Point 2 θ2 °C
Temperature at the Point 3 θ3 °C
Temperature at the Point 4 θ4 °C
Temperature at the Point 5 θ5 °C
Temperature at the Point 6 θ6 °C
Temperature at the Point 7 θ7 °C
Temperature at the Point 8 θ8 °C
Temperature at the Point 9 θ9 °C
Temperature at the Point 10 θ10 °C
Additional external loads:
Additional longitudinal force qz kN/m
Additional lateral force qx kN/m
Additional bending moment mz kN·m/m
Additional bending moment mx kN·m/m
Special case – round membrane wall:
Radius of the membrane wall Rw mm
Inside gas overpressure pgas bar
Pendant mass Mw kg
  Sketch
Additional options
  Cover force caused by pi loads the tube only
  Transverse loads cause local stresses  
  Gas pressure pgas does not cause cover force