I have a frp vessel with four legs build as EN-13121-3.
the nozzle is vertical and is on the top of vessel.
I try to model in this way

flange (of pipe)
anchor + cnode
flange (equipment)
pipe ( for the distance nozzle-top vessel)
rigid element- no weight d=dia vessel th=thinkness vessel
lenght= height from tangent line to tangent line
anchor (on the bottom)


can you check this model?
(I'm sorry, I have an image but I'm not able to upload it)
and also is it possibile to use wrc 297 in this case?

Regard