We do not consider any S.I.F for the Trunnion in the caesar spreadsheet. However, the axial stresses and also bending stresses due to loads multiplied by moment arm of the Trunnion at the point of intersection of the trunnion with main pipe will be checked externally to find out if there is any need for any pad to limit the streses within allowable limit.
Some simplified spreadsheets are generally used to find out the combined stresses at the intersection point.