Oceans of knowledge
Turntable Buoy & Turret Buoy
The turntable buoy is a further development of the bogey wheel buoy (first design for an SPM developed around 1958) to eliminate the horizontal loading of the rotating frame on the swivel bearing. This was achieved by supporting the rotating frame by its own large-diameter 3-race roller bearing.
The turret buoy is a further development of the turntable buoy with some major adaptations. In the turret buoy design the geostatic part is limited to a turret assembly consisting of a turret shaft and a chain table fitted in the centre line of the buoy body. The buoy body can rotate around this turret via a 3-race roller bearing.
This concept allows the bearing and all other mechanical equipment to be located inside the buoy body where they are protected against the salty environment and seawater. The space inside the buoy can easily be increased by a spacious deckhouse fixed on top of the buoy body.
SPM systems are typically designed for nearshore applications with water depths starting from 15 metres. The mooring connection between the buoy and the vessel depends on local environmental conditions and requirements for the permanent mooring of the vessel. The mooring connections use the following systems: hawser, rigid arm and soft yoke system.