Turret mooring systems

Internal and external


· Uses turret structure

· Fluid and gas swivels are needed (Video: Courtesy of SBM)

· Electrical power and control swivels needed

· Limited number of risers and umbilicals


A turret  mooring system is defined as a mooring system where lines are connected to the turret which via bearings allows the vessel to rotate around the anchor legs.

This  turret can be mounted either internally or externally. An external turret is fixed, with appropriate reinforcements, to bow or stern of the ship. In the internal case the turret is placed within the hull, in a so called moon pool. The chain table, connecting the mooring lines to the turret, can be either above or below the waterline.



External cantilevered turret


External Turret Mooring Systems provide an excellent solution for a wide range of FSO/FPSO applications.

These proven single-point mooring systems permit the vessel to freely "weathervane" 360 degrees, allowing normal operations in moderate to extreme sea conditions. External turret systems are less expensive than internal turret designs and can be delivered in a shorter period of time, making them an excellent choice for many applications. External turret mooring systems can be mounted at either the bow or stern of converted tankers or new-built vessels.












Picture Gallery (Picture: Courtesy APL)


Internal Turrets



· Permanent and Disconnectable systems

· Moderate to harsh environment

· Deep water applications


Internal permanent turret mooring systems provide FSO/FPSO operators with maximum mooring and fluid transfer capabilities in remote, deepwater and/or harsh environmental conditions. Larger internal systems can accommodate up to 100 or more risers in water depths ranging between 100 to 10,000 feet or more. For locations with severe cyclonic weather and harsh sea conditions, the internal turret mooring system provides full weathervaning and enhanced mooring load capacities that enable the FSO/FPSO to remain permanently on location under the most demanding conditions.


Disconnectable systems are, like their permanent counterparts, internal disconnectable mooring systems are applicable in offshore areas of the world subjected to harsh environments and where seasonal cyclonic weather systems or icebergs are predominant. While the turret enables the vessel to freely weathervane in normal to severe conditions, this type of internal system allow the vessel to disconnect to avoid typhoons, hurricanes, icebergs, and other extreme dangerous conditions. The disconnect and reconnect sequence is quick and reliable.












Picture Gallery (Picture: Courtesy APL)

Moor inc.

knowing how to moor it!