I have some problem that failed in EXP stresses as attached.(Node.1580 is failed by 128% at design temp.)
I will try again with changing S.I.F as per the STP-PT-073.
But I don't know how to apply exactly.
Belows are my some question. Please reply...

1. Regarding TEE intersection, is it possible to input value for " Run in/out plane" only? or should I input SIF for In/out-plane, torsion, axial?

2. In my case, the overstress point is node.1580 as attached, Can I change SIF for node 1580 only? or should I change SIF for near 90elbow, 45elbow together?
or all branch and bend point in this system to be changed? Which is the most accurate?

3. I heard that we can use FEA programs like FEATools, Nozzle pro.. to insert stiffness at branch connection also. What is the difference among below 3 method?
1) Input SIF calculated by hand as per STP-PT-073 ANNEX A
2) Input SIF calculated by NOZZLE PRO
3) Insert stiffness value calculated by NOZZLE PRO