UG33 module
For heads or reductions, spherical, elliptical, torispherical or conical geometries can be used. In the ASME code, the deviation from the spherical form for external overpressure is considered by geometry factors for the evaluation of the material-temperature curves. For cones, the cross section and for effective reinforcements the moment of inertia of the angle joint must be checked.
The module UG33 determines the required wall thickness of elliptical, torispherical or semispherical heads under external overpressure. For torispherical and semi-ellipsoidal heads, the geometric relations for a spherical torus are included. For cones, the cross section and the effective reinforcement of the angle joint at the large and small end can be calculated.
ASME Boiler & Pressure Vessel Code VIII, Div. 1