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Anchor Arrangement.

The anchor arrangement is designed to keep the FPSO in position. In the design process it will be taken into account the constant changing motions and forces of the ships due to current, wind and waves. Depending on the environmental conditions, like soil type of the location an anchor arrangement is chosen.

Types

 

Internal Turrets

In this design the turret is build inside the hull in what is called a moon pool. The chain table, connecting the mooring lines to the turret, can be either above or below the waterline. Usually the system is located in the front end of a vessel. In very exceptional cases it can be found at mid-length of the ship. This type of turrets can accommodate over 100 risers which gives this system a high fluid transfer capability. Because the turret is directly attached to the hull, the forces on the mooring cables are better transferred in the hull than in the case of an external turret.

However for construction or if damaged, an internal turret requires dry-docking, which is a great disadvantage. An internal turret is also more expensive than external turret designs and requires a longer construction time. The system described is an permanent turret but there are disconnectable internal systems as well. The operations depth of a FPSO with an internal permanent turret range is between 30 and 3000 meters

 

Internal turret mooring system

 

External Turret Mooring