An assembly for transferring fluids between a vessel and a turret structure mounted in said vessel for a rotation around a substantially vertical turret axis is provided. Said turret structure comprises a swivel having at least one fluid path which is connected with one end of a fluid piping of which the second end is connected to the vessel. A swivel tower mounts around the swivel and engages the remainder of the turret structure by a swivel tower bearing. A torsion lock mechanism substantially locks the swivel tower to the vessel for a rotation therewith. A first fluid piping segment extends freely between the vessel and the swivel tower and a second fluid piping segment extends between the swivel tower and the fluid path of the swivel. The segments are joined at an interconnection where the fluid piping is substantially fixed to the swivel tower by fixing device.