Hi all,

On several cases I have encountered leads that allow me to model a pipe connection to a vessel using displacement as a starting boundary condition or otherwise a terminal one. About three years ago somebody form COADE told me that the best way (if you don't model the vessel itself)is to start with a rigid restraint or node point with stiffness and a connecting node to represent (if applicable) displacment. The way I would think it, that should be the proper way because displacement will reperesent any size of nozzle no matter how stiff it for any specified temperature. The stiffness however is supposed to change as the size of the nozzle changes. So, asking for a more reliable tips from you guys (specially to Richard and Dave).

Thanks.

You would call the "node point" a nozzle. CAESAR II supports three types of flexible nozzles: WRC-297, API-650, and PD-5500. Calling a node point a nozzle presents you with a dialog where you define additional data about the vessel or tank. This data allows the program to compute the nozzle stiffnesses and apply them between the "node" and the "cnode".

If your nozzel doesn't conform to one of the three types listed above, you'll have to come up with your own stiffness values, but you can still use them between the "node" and the "cnode".