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ASME ligaments calculation for arrayed pipes

ASME ligaments calculation for arrayed pipes

ASME ligaments calculation for arrayed pipes

(OP)
I have tried to look for some tips about this specific problem, but my doubts are still there.
So, here it is...

In attachment I'm posting the geometry of a pipe array that will work as a steam heat-exchanger in an atmospheric melting tank.

The pipe arrays are made up of an upper and lower pipe frame (dia88.9 x 7.62) connected togheter with a vertical array of smaller pipes (dia 60.3 x 5.54)
Now, what if I wanted to verify that the design pressure can be increased?

Would you rely on UG-53 ligaments paragraph, considering the 88.9 pipe as a "shell" and the 60.3 pipes as openings?
I don't like this approach that much, but at the moment it's the only reference I found to present some sort of calculation to somebody.
I could go through a FEM analysis, but I'd like to have some sort of analitycal reference, if available.

Do you have any idea (different codes, formulas, methods)?
Thank you!
 

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