ASME BPVC.VIII.2010.1 Appendix 13 Sketch 6 calculation issue

[Faustie]

Hello. I'm trying to make a spreadsheet & Python script to calculate stresses for a type 6 rectangular pressure vessel, as defined in 13-8(h) on pages 471-472. An example is given in 13-17(j) which I'm working through, on page 490. In case of any errors I've also checked the 2023 edition, and the calculations are the same but this one doesn't include the example calculation.

I've gotten as far as correctly matching all of the membrane stresses for the given example, but I get differences in my K₈ and M_A factors despite triple-checking the equations, so my bending stress calculations don't match.

I did have to make a couple of changes in the previous section, following advice given in this old thread, so Eθ₁ is substituted with E_M, and θ_M and θ_N are capped to the value of θ₁ if they're greater. This all works well and matches so far, but I'm confused how to continue with K₈ and M_A not aligning (I get -45.23 instead of -38.81 for K₈, and -10,447 instead of -8,965 for M_A).

Would anyone have any worked calculations for these, or know of any errata affecting the bending stress calculations? I'm of course happy to share my spreadsheet/code if anyone would be willing to take a look. Thanks!

 

[AD_1979]

Hello,

Would it be possible to have a contact with you? I'm a beginner with Python and I'm interested to see how the calculations could be implemented in a Python script, of course if you are willing to share.

Thanks in advance.