A: shell start;

B: shell end;

C: center of bending axial curve;

Leg #1: end of cylindrical part at point A;

Leg #2: end of cylindrical part at point B;

Sup #2: stanchion end.

Stanchion LCS is according to nozzle LCS and is also permutable CS of leg #1:

Aixs X: is directed along longitudinal axis of leg #1.

Aixs Y: is directed along normal to bend plane (coincides with Z axis of bend).

Aixs Z: is directed along local X axis of bend and is always perpendicular to the leg #1 longitudinal axis (is longitudinal stanchion axis).

Depends on base element orientation (see Bend (elbow)).

Relative to base element is set by the offset parameter $l_d$ from point B (fig. 3.60), while directions of stanchion LCS is keeped.

For strength analysis (fig. 3.59):

Point Sup #2 (stanchion end).

When calculating allowable loads, stiffnesses and stress intensification factors for leg #2 (fig. 3.61):

Point A (or leg #1).

When calculating allowable loads, stiffnesses and stress intensification factors for stanchion junction (fig. 3.62):

Points A, B (or legs #1 and #2).

Described in section: Bend (elbow).

Also, concentrated loads to end A or leg #1 for strength analysis (fig. 3.63):

Thermal strains.

They are carried out for stanchion junction and leg #2 (indices 1 and 2 according to fig. 3.64):

Allowable loads;

Stiffness and flexibility factors;

Stress intensification factors.

Described in section: Bend (elbow).