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Large Diameter Openings

Large Diameter Openings

Large Diameter Openings

(OP)
I need help with a design question.

Case:
 
Installing a 48" diameter nozzle in a 144" ID (.625 wall carbon stl.)  vessel built to Sec. VIII Div 1.  UG-36(b)(1) refers you to Appx 1-7 or 1-10 to calculate a large diameter opening.  Per my software, the nozzle is failing under 1-7.  However, the customers engineer says he can make the nozzle work under Div 2 Part 4.5.  He is sighting U-2(g) as his basis for using this Div 2 calculation.
 
Question:  Is it the intent of U-2(g) to allow the use of a Div 2 calculation in this case?
 
My initial thought was no.  However; the last paragraph in 1-10(d) leads me to believe it is allowed.


Follow up question:  This will work if I increase the shell thickness to 1-1/4"  Can I use a locally thickened shell section in the nozzle area (in addition to the re-pad)?  How would you simulate or calculate this in the program?  I am using Advance Pressure Vessel.

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