Dear every stress analysis colleague:
As we know, the SIF value in AppendixD of ASME31.3 is limited by the ratio of d/D and the ratio of D/T.
So during piping flexibility analysis, to the critical pipe I want to give a more exact SIF value to the tee. I use Nozzlepro to get them. the value form Nozzle from always is less than that from CII.Even I get value less than 1.
First one:I feel confused why there has vlaue less than 1 for SIF?
Second one : in note 12 of Appendix D, if 0.5<d/D<1, The value is non-conservative, it mean the actual SIF is more than that from B31.3, But
from Nozzlepro , I still get less value?
third one: the SIF to branch is always bigger than the SIF to header,
how to select which should be used?

Thanks!