In my case I have 450 NB header of SS 304 (sch 10S) and there is a drain line 50NB (sch 5S)(with end free with blind flange).

Most of us believe that if line is free then there is no need to model SIF, but one of our clent insisted to model SIF event attemp Indicator and Pressure indicator, due to this we required to add more flexibility to line to pass line in expansion stresses