Interferences between nozzles
Interferences between nozzles
(OP)
Hi All,
We have to design a vessel at high temp. 700C according to DIV2, the result of P-elite shows that two nozzles are close to each other and there is interference between them, even the available area is higher than the required. we make a FEA for these two nozzles and the stresses based on the applied piping loads are OK. The relocation of the nozzles has a huge impact in our design. please let me know your opinion, can we deviate code regarding the interference between two nozzles if the stresses based on the FEA are ok?
Thanks in advance
We have to design a vessel at high temp. 700C according to DIV2, the result of P-elite shows that two nozzles are close to each other and there is interference between them, even the available area is higher than the required. we make a FEA for these two nozzles and the stresses based on the applied piping loads are OK. The relocation of the nozzles has a huge impact in our design. please let me know your opinion, can we deviate code regarding the interference between two nozzles if the stresses based on the FEA are ok?
Thanks in advance





RE: Interferences between nozzles
'4.5.13 Spacing Requirements for Nozzles
4.5.13.1 If the limits of reinforcement determined in accordance with paragraph 4.5.5 for nozzles in cylindrical or conical shells or paragraph 4.5.10 for nozzles in spherical or formed heads, do not overlap, no additional analysis is required. If the limits of reinforcement overlap, the following procedure shall be used or the design shall be evaluated in accordance with the design by analysis rules of Part 5.'
Accordingly, you don't have to deviate from the code, but use the analysis of Part 5.
Cheers,
gr2vessels
RE: Interferences between nozzles