Hi, I have a nozzle reinforcement calculation. As per the UG-37, the area replacement rule, Aa < Ar, it fails, but WRC or FEA results pass. Can I use the WRC or FEA result for fabrication?
Thanks.
sxz, I infer your Code of construction is Sec VIII, Div 1 from your reference to UG-37. See UG-1(3). If you are representing your vessel to meet this Code, short answer is, no, you may not.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
In general, I would agree with SnTMan that the answer is a pretty hard no.
However, if you were to design this to the 2019 Edition of Division 1, then you could apply the provisions in UG-16(a) to make use of Appendix 46. From there, I would take a first pass at the nozzle reinforcement rules in VIII-2 (specifically Section 4.5, as noted in 46-3(a)(1)). If that doesn't get you to where you need to be, then you could apply the Design By Analysis rules in VIII-2, per 46-4. However, I would note that you would probably need to re-do the FEA, as I highly doubt that it was actually compliant with the requirements as listed in 46-4.
For the design case of reinforcing the nozzle for 'internal pressure only', Appendix 46-4(a) specifies:
"46-4(a) Division 2, Part 5 (FEM) shall not be used in lieu of the design thickness requirements of Division 1 or Division 2, Part 4."
My interpretation of this is that design by rule (Div 1 or Div 2) needs to be used for simple pressure only reinforcement of a nozzle. You can't use FEM.
For the design cases where loads are applied to the nozzle then 46-4(a) doesn't apply and therefore FEM is acceptable.
Bore of HB is not 12"....Bore of LWN is 12"....Bore of HB is 11.38". I have no problem eliminating pad with info you gave. Straight replacement only....not opening the can of worms...