Nozzle loads in square connections

[geodesia]

Hi all
I am trying to find out how to solve a proble, I am facing now: I have a square connection welded to a pressure vessel (Calcualted with ASME VIII Div.1) with several nozzle loads
For nozzle loads issue, I am used to work with WRC107,because normally we work with round connections...but now....how can it been solved?

I have no any clue...so any little help or reference would be really appreciated

 

[TGS4]

WRC-107 has the ability to evaluate rectangular connections as well.

 

[JStephen]

I was thinking WRC-107 was actually derived considering a square or rectangular loading area.