Hi,

I have modeled a 2"x300# LWNRF Nozzle as per the below dimensions.
My shell thickness is 45mm.




As you can see that the OD of the nozzle is 84mm and hence the opening size in the shell will be 84mm and will not be exempt from area calculation as per UG-36(c)(3)(a).



My doubt is why is PV Elite exempting this nozzle from area calculation.
I know that i can force the software to calculate the area, but what i want to know is, why the software is exempting it from area calculation even though the opening is 84mm.

Thanks in advance.
Roy

Hello Roy123

Actually, if you look at the definition of the diameter (d) in ASME Section VIII, Division 1, it has nothing to do with the diameter of the hole cut into the shell. The diameter is based upon the corroded inside diameter of the nozzle. You can see that in Figure UG-37.

Thank you very much Ray.

Hello Roy123

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