Elliptical Head CIS
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ASME Code - Allowable Stresses
  • Stress Values- Section II, Table 1A
  • Stress Values- Section II, Table 1B
  • Stress Values- Section II, Table 3
  • Carbon Steel - Example
  • High Alloy Steel - Example
Shells and Heads
  • Cylinder under internal pressure
  • Elliptical head under internal pressure
  • Torispherical head under internal pressure
  • Klöpperboden (DIN28011) under internal pressure
  • Korbbogenboden (DIN28013) under int. pressure
  • Hemispherical head under internal pressure
  • Flat head (circular) under internal pressure
  • Flat head (noncircular) under internal pressure
Flanges
  • Equivalent flange pressure due to ext. loads
  • Loose-type flange under internal pressure
  • ASME B16.5 Flanges
Determination of foming strains
  • Forming strain of a cylinder
  • Forming strain of a head
  • Forming strain of tube or pipe bends


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Elliptical heads - ASME Code Section VIII, Division 1

 
 

internal pressure P:

bar CIS ASME TÜV Thüringen Group
mm

head thickness thead:

mm

allowable stress S:

N/mm2

joint efficiency E:

-

hight h:

mm  

Intermediate Results

Results

  I [App.1-4(1)] II [App.1-4(1)]    
Online Rechner ASME Code Online Rechner ASME Code    

required wall- thickness treq:

   

design margin:

   

Input Errors

 

Notes

The formula for the typical 2:1 elliptical head is listed in paragraph UG-32(d) of ASME Code Section VIII, Division 1. The general formula for all elliptical heads within the dimensional scope is addressed in Appendix 1-4. Factor K varies depending on the shape of the ellipse. Please note that an elliptical 2:1 head must not be mixed up with the German DIN 28013 torispherical head (Korbbogenboden). Although both types of heads are within each other’s shape tolerances, they shall be calculated using different formulas resulting in different required thicknesses. As a rule the required wall thickness of an elliptical 2:1 head is less than that of a Korbbogenboden. If a nozzle reinforcement calculation in the crown area is needed, however, the Korbbogenboden formula is more advantageous.

P = MAWP + hydrostatic head at operating conditions
Do/D = ouside/inside diameter of the straight flange in corroded condition
S = allowable stress value from Section II, Part D of the material at design temperature
E = efficiency factor 1 for seamless heads if UW-11(a)(5)(b) is met (Cat. B o C adjacent butt welds needs to be spot radiographed as a minimum) otherwiese 0,85.
h = inside height of the head without straight flange in corroded condition (example: typical 2:1 elliptical head with 1000 mm inside diameter => h = 250 mm)

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ASME Section VIII Division 1
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