A turret mooring system for a floating process and storage offloading, FPSO, vessel or a FLNG vessel includes a turret structure and a bearing support structure. The turret structure is to be placed within a moonpool in a hull of the vessel and rotatably held within the moonpool via the bearing support structure. The bearing support structure includes a radial support and an axial support. The radial support includes a plurality of radial wheels, and the axial support includes a plurality of axial bogies. The vessel has a topside process deck and the turret structure includes a collar deck. The collar deck is positioned vertically above an upper side of the axial support and below an elevation of the topside process deck. An FPSO or FLNG vessel is provided which includes the turret mooring system.
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