In the framework of a subsea pipeline calculation, I noticed that the same load case corresponding to pipe filled with water (WW) leads to different vertical reaction on supports if the stress type is HYD compared to OPE or SUS: with HYD the loads are lower (about 20% less).

As far as I know there is no theoretical basis for this and comparing CAESAR results with hand calculated pipe and content weight, the higher values seem to be the correct ones.

In this case, calculation of Hydrotest condition would be uncorrect, on the unsafe side.

Can someone help me on this topic?

Thanks in advance.

A nice day to all.

P72