Dear All,

I just want to know, Do I need to subject the vessel connected to the pipe for seismic analysis OR just the pipe only?

Also, Do I have to evaluate the nozzle loads of vessel with seismic loadcase?

Please I need your opinion and expertise.

Thank you.

Regards,
Marco

I would think the vessel anchorage/support system should have been designed to the applicable seismic activity.

I would say you're performing pipe stress analysis; emphasis on pipe. Model the piping system and model the vessel nozzles per standard practice using rigids and Cnodes.

The seismic load on your piping should in some way address the contribution from your connection points. Oftentimes your piping support points such as your vessel nozzle will have a maximum displacement associated with the seismic event. One would include those maximum seismic displacements (e.g., D4) with the "seismic g load" load case (e.g., ...+U1+D4).

Dear Mr. Dave,

Where can I get those "Seismic Displacement" that you mentioned?
What if in the model/simulation of my input in Caesar II the vessel is already modeled as rigid pipe do, do I still need to imposed that "Seismic Displacement"?

Lastly, do you think it is needed to evaluate the nozzle for Seismic Loadcase?

Thank you and I hope for your usual support.

Regards,

Marco

Marchie,

I would expect that data to come from the structural group who designed the equipment support structure.