Dustin,
I have performed the calculations by hand (see attachment) and I match Caesar II's results perfectly (right down to the third decimal place). You are not using the branch equation which is listed plainly in B31.1 Table D-1 just below the Welded-in contour insert sketch.
You can reduce this SIF by switching to Pre-1980 version of B31.1 (see the Configure/Setup switch called Reduced Intersection). Or you can switch to B31.3. But for the modern B31.1 the results are correct for the input you gave. You could also beef up the run pipe wall thickness in this section to reduce this SIF considerably.
Attachments
82-BranchSIF.pdf (692 downloads)
Edited by Loren Brown (05/01/07 11:19 AM)
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