'Set-in vs set-on' strikes back! 1

[ElCidCampeador]

Hello, I've read many threads in this forum about set-in/set-on nozzles and what is the "best" solution for a pressure vessel.
I usually design according ASME VIII Div.1 but this code seems not to suggest a preference for a insert or a set-on configuration as long as you follow figure UW-16.

But from a "SIF" point of view, it seems to me that a set-on weld is worse than inserted. Do you know any research paper or standard that I can read about?

I've read B31J (which was appendix D of ASME B31.3) , e.g. table 1-1, but I don't understand sketch shown and "Run SIF" defined. What am I supposed to take away from all this? Please help me, thank you.

 

[TGS4]

I have to concur with r6155 on this one. The calculation of an SIF, necessarily implies the calculation of a peak stress (range). Following the rules of ASME Section VIII, Division 2, Part 5, the peak stress (range) will be modified by a FSRF (Fatigue Strength Reduction Factor). And these FSRFs are a function of the type and extent of the NDE performed. If there are location that cannot receive any type of inspection (such as the root of a fillet weld), then that particular location will receive an FSRF=4.0. Other surfaces that may receive different NDE will necessarily have a different FSRF.