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CIS ASME TÜV Thüringen Group

Online Calculation-Tools

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
  • Equivalent flange pressure due to ext. loads
  • ASME B16.5 flanges external loads - UG-44(b)
  • Loose-type flange under internal pressure
  • ASME B16.5 Flanges P/T Ratings
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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Klöpperboden (DIN28011) ASME Code Section VIII - Division 1


internal pressure P:

bar CIS ASME TÜV Thüringen Group

min. wall thickness tmin:


allowable stress S:


joint efficiency E:


Intermediate Results


  I [App.1-4(3)] II [App.1-4(3)]    
Online Rechner ASME Code Online Rechner ASME Code    

required wall-thickness treq:


design margin:


Input Errors



One difficulty which frequently occurs when calculating „Klöpperböden“ according to DIN 28011 which are subject to corrosion is the UG-32(j) requirement regarding the maximum crown radius. UG-32 states that the “inside crown radius to which an unstayed head is dished shall be not greater than the outside diameter of the skirt of the head”. DIN 28011 determines the crown radius of a newly fabricated “Klöpperboden” to be identical with D0. According to ASME Code Interpretation VIII-1-86-175 this requirement does not only apply to new, but also to corroded heads. Thus this requirement cannot be met by any “Klöpperboden” subject to inside corrosion.

Some calculation programs (e.g. Compress, PV Elite) provide the user with the option to consider or to ignore this interpretation. In the latter case the program will not report any deficiency. Since the calculation form above always uses L = D0 (even if you calculate the corroded condition), please consider that a new Klöpperboden subject to corrosion does not meet DIN 28011. It has to be ordered with a crown radius of D0 - corrosion.

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These calculation tools are intended to be used for information and guidance only, they do not replace a detailed design calculation and compliance with all applicable Code requirements. CIS GmbH expressly disclaims liability for errors and omissions in the contents of this site.

ASME Section VIII Division 1
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