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CIS ASME TÜV Thüringen Group

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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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Hemispherical head 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.1-1(2)] II [UG-27(3)] III [App.1-3(1)] IV [App.1-3(1)]
Online Rechner ASME Code Online Rechner ASME Code Online Rechner ASME Code Online Rechner ASME Code

required wall-thickness treq:

design margin:

Input Errors



Just as for cylinders the ASME Code provides four different formulas for the design calculation of hemispherical heads. In order to determine the joint efficiency factor E the requirements listed in UW-3(a) referring to the joint category have to be accounted for. According to UW-3(a) the attachment weld of a hemispherical head to a cylinder is always classified as a Category A weld subject to circumferential stress. Since the hemispherical head therefore includes a Category A joint at all times, the ASME Code never considers it as a seamless, but always as a welded part. This also applies to hemispherical heads manufactured from seamless plates. Thus the requirements of UW-12(d) for seamless vessel sections must not be used. Due to that reason the joint efficiency factor of hemispherical heads, although without additional welds, shall be determined using paragraphs UW-12(a), (b) or (c) depending on the design and volumetric examination of the attachment weld.

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ASME Section VIII Division 1
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