A: shell start;

B: shell end;

Axis X: shell transverse axis;

Axis Y: shell transverse axis;

angle θ of nozzle insertion is taken from this axis toward axis X;

Axis Z: shell longitudinal axis.

All axis can be horizontal and vertical according to the shell options:

For strength analysis (fig. 3.34):

Point A.

When calculating allowable loads, stiffnesses and stress intensification factors for a nozzle (fig. 3.35):

Points A, B.

Inner overpressure.

Outer pressure.

Hydrostatic pressure.

Thermal strains.

Concentrated loads to free end (B) for strength analysis (fig. 3.36):

Allowable loads for end B (fig. 3.37).

Stiffness and flexibility factors for end B (fig. 3.37).

Stress intensification factors (fig. 3.37).

Specifies the offset of point B relative to point A (in the plane of the local X and Y axes).

Defining taper by the wall slope angle or the second diameter.

The base element also allows to specify: cylindrical legs at the start and at the end, reinforcing parameters of ends.