The SCF at conical transitions is calculated correctly by SACS using the DNV formulation. However, for transitions where the cylinder and cone have different thicknesses, the fatigue damage calculation is not fully consistent with the DNV methodology. The SCF on the conical side should be combined with the nominal stress in the cylindrical section, whereas SACS applies the SCF to the stress in the conical section. Consequently, the calculated fatigue damage may be inaccurate for such configurations.

Extracts from DNV RP C203

The stress concentration at each side of unstiffened tubular-cone junction may be estimated by the following
equations (the SCF shall be used together with the stress in the tubular at the junction for both the tubular
and the cone side of the weld):