Calculation according to WRC297

Hi
I have a question about WRC 297.

Hoop stress (Pm) calculated for vessel is done with Lame's equation.

I get the same result by hand calculation but not for the nozzle.

I can't find where the difference comes from for the nozzle. Could you enlighten me?

Thanks

Please scan your work and open an SR on Smart Support so we can go through the calculations.

Thanks Richard.

Please find the example. I'm gonna open an SR.