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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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Calculation of torispherical heads - 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:


inside knuckle radius r:


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


Torispherical heads with knuckle and crown radius are adressed in paragraph UG-32 of ASME Code Section VIII, Division 1. This special formula in the general UG part of the ASME Code only applies to 6% heads whose knuckle radius is 0,06 times Do. For all other torispherical heads the general formula of Appendix 1-4(d) is used.

Please note that the minimum length requirements of the straight flange as shown in Fig. UW-13-1 sketch (l) and (m) must be met if the wallthickness of the heads exceeds that of the attached cylinder(min[3xth; 38 mm]). If, however, the head is inserted into a flange ring, the minimum length of the straight flange is addressed in Appendix 1, Fig. 1-6, sketch (a), i.e. insertion length + leg dimension of the fillet weld at the backface of a loose flange, and insertion length + leg dimension of the fillet weld + 13 mm for integral flanges respectively.

P = MAWP + hydrostatic head
S = allowable stress according to ASME Code Section II, Part D
E = efficiency factor E = 1, if seamless and meeting UW-11(a)(5)(b)
efficiency factor E = 0,85, if not meeting UW-11(a)(5)(b)
efficiency factor according to UW-12, if welded

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ASME Section VIII Division 1
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