hello, i`m designing a piping system which has oulet nozzles, placed in the head of the vessels.
caesar do not allow nozzles placed in the same centerline of the vessels. how can i do

please, someone help with this

That's most likely cause WRC297 is for nozzles on cilindrical vessels only. If you know the flexibility of the nozzle you could add x,y,z,rx,ry,rz restraints with stiffnesses.

Search this Forum for wrc297 nozzles, you'll find some guidelines on how to obtain estimated stiffness results for this configuration.

FE-107 is an option to obtain flexibility;

http://www.paulin.com/WEB_FE107_Experimental_Validation.aspx