ASME ASME ASME 1

[PVRV]

Why arent corroded conditions considered for nozzles ?
(re-enforcement pad calculations)

 

[deanc]

They are. This should be addressed when you determine the required minimum thickness at the start.

 

[PVRV]

RF-Pad calculations:

When calculating A2; (area avaliable in the nozzle)
corroded conditions are not being considered by ASME
consequently RF-Pad size decreases. In other others
the corrosion allowance (at the start) is considered towards the reduction of the RF-Pad dimensions.

Please advise & provide insights

thanks

 

[jte]

PVRV-

Fig. UG-37.1 might help you in understanding the definitions of tn and trn. The measurements start where the corrosion allowance ends. That would be the dashed line on the inside with the "c" dimension on the inside left hand side. The corrosion allowance is shown for the shell, inside projection of the nozzle, and outside projection of the nozzle.

jt

 

[PVRV]

Cheers