Module B3
Dished pressure vessel ends may be of torispherical form, semi-ellipsoidal form or hemispherical form. The crown section or semi-spherical part can be designed according to the AD-Merkblatt B1. The increased stress in the knuckle or the connection of the semi-sphere, respectively, can be considered by a correction factor. Since this factor depends on the wall thickness, an iterative procedure is necessary for the design.
The module B3 determines the required wall thickness in the knuckle area and in the crown section area, as well as the necessary skirt height of torispherical ends, semi-ellipsoidal ends or hemispherical ends. For the actual wall thickness, the largest nonreinforced opening is indicated, which requires no additional proof.
Calculations can also be performed with the modules EN 07 and EN 08 of the European Standard EN 13445-3.
AD 2000 Merkblaetter