Hi Samhuff, Thanks for taking time to answer my question. Appreciate it. I would prefer to model the first option you've suggested. However, by doing this I would not be able to get the support load on the bottom piping, particularly the lateral load. Because if this equipment is to be installed subsea, it is subjected to wave and current from all directions. I would still prefer to include a guide at the bottom piping and connect it to the above pipe in addition to what you've suggested. And the area of concern from my scope of work is not Wye actually (but to some extent), because I will be providing the forces and moment acting on the wye to the manufacturer for detailed FEA check. I am only interested with the code check for the subsea pipeline (as this is connected to a pipeline) but at the same time ensuring I am modeling the correct response due to the supports. After I have given some thought, technically speaking, the upper and bottom piping do not connected to each other if the above pipe is moving up (as this will loses contact with the v-stop) or if the bottom pipe is sagging down provided the above pipe is not following down. This MAYBE can happen when there is wave and current and there is lift force. However, with the above piping is to be connected to a tie-in spool, I think this most likely will not happen due to the overall weight, but some sensitivity checks should be performed to confirm this.
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