Dear All,

In my present assignment, there is requirement of integrated analysis(Structural + Piping). Corresponding lines are connected to sphere nozzle & some of pipe supports are itself from sphere. Then how to model spherical in Caesar?? If I give actual values at sphere nozzle from Nozzle pro, then what about the pipe supports from sphere itself.

Since this is dynamic analysis, I want to avoid approximations in modelling.

You may have to sketch out your sphere first in AutoCAD to see how your nozzles are coordinated, and then figure out where the sphere itself is supported. Have a rigid element going up from the support to the height of your nozzle, and out to the nozzle-shell interface. You will have some funky angles, but if you put nozzle flexes in, and simulate the thermal growth of the spherical vessel itself with rigids, then I would think you would have a pretty good model.

@threeouts, thanks for your quick response.
But this is dynamic analysis, so modeling equipment with rigid is not possible. And since this is structural + piping analysis, then what about the pipe supports taken from sphere?

Caesar uses beam elements, so to include your sphere somehow you are going to have to make approximations as threeouts has suggested. You might consider including an element at each sphere surface / pipe support attachment to represent the shell flexibility.

Yeah you model your sphere with rigid elements to simulate the thermal growth, but at each interface, whether it is nozzle-sphere interface or pipe support-sphere interface, you would define flexibilities. I typically only do nozzle flexibilities and assume pipe supports as rigid. Then again I only do static analysis, I am not familiar with dynamic analysis in the least.

Dear All, Thanks a lot for your valuable suggestion.