Thanks MoverZ and Dave, for pointing out that App.D SIF's should be both applied to the branch and run pipes. I almost forgot because recently I'm working on nozzlepro SIF's where there is different SIF's for branch and run pipes. Just like for 2" branch, I am getting a SIF value of less than 1.0 on run pipe. Is App.D SIF's too conservative for the run pipe?

And yes it's a good practice for beginners to consider all SIF's in a system, unless he can identify and narrow down where the high stress points are before the start of analysis.