AutoPIPE - AutoPIPE's calculated SIF values are inconsistent with manual results.

Scenario 1:

How does AutoPIPE determine the in-plane run SIF for a Sketch 2.6 integrally reinforced welded branch fitting, given that the result does not align with manually calculated values?
AutoPIPE SIF Value: 3.038
Manually Calculated SIF Value: 3.427

Answer: AutoPIPE calculates the in-plane run SIF for Sketch 2.6 based on the rules and constraints defined in the ASME B31J code, specifically referencing Notes (1), (7), and (10) applicable to this sketch.

Refer to the Note (7) as shown below:

Note (7) outlines the bounding conditions for SIF and flexibility factors across various sketches:

For Sketches 2.1, 2.2, 2.4, 2.5, and 2.6:

- - The SIFs (iib', iob', itb, iir, ior, itr) and flexibility factors (kib, kob, ktb, kir, kor, ktr) must not exceed the corresponding values from Sketch 2.3 and Figure 1-3(d), assuming the same branch and run pipe dimensions and r2 = 0.

- - The SIFs (iibo, iob, itb, iir, ior, itr) and flexibility factors (kibo, kob, ktb, kir, kor, ktr) must be at least equal to the corresponding values from Sketch 2.1, calculated using Tc = 1.1T.

AutoPIPE Report: Shows the computed SIF value of 3.038.

Manual calculations: Indicates a higher SIF of 3.427.

AutoPIPE’s SIF calculation for Sketch 2.6 adheres to ASME B31J Note (7), which enforces upper and lower bounds based on other sketches. The capped value ensures that the SIF does not exceed the reference from Sketch 2.3 (3.038) , even if manual calculations suggest a higher value (3.427).