Thanks for your reply,
I have alredy tried to generate connections in this way but Mechanical crashed every single time.
However, I managed to get it working by using mesh connections and selecting all bodies in my geometry. Similarly to what is done in this tutorial: Batch Connections in Ansys – Never use Share Topology for Beam and Shell models | Finite Element Analysis (FEA) Blog – LEAP Australia & New Zealand
The problem now comes when I implement this solution onto my full model. The aforementioned error disapears but I get an unknown error when solving: Invalid element number = 0. The SFE command is ignored. Which doesn´t occur when I suppress the pipe pressure load.
¿Is there any other way of running this simulation?