What is turret mooring system?

In essence, a turret mooring system comprises a fixed turret column held by an internal or external vessel structure via a bearing arrangement. Therefore the vessel-bound components can weathervane freely around the turret which is fixed via a number of anchor lines with respect to the seabed.

What type of mooring system is installed in the FPSO?

FPSOs are anchored to the seabed with mooring lines, usually consisting of 6 to 10 chains or wires. Typically, the mooring lines and the hull of FPSOs are connected by the Turret system, which is connected to the hull via giant rotating bearings.

What is mooring system in offshore?

A mooring system is made up of a mooring line, anchor and connectors, and is used for station keeping of a ship or floating platform in all water depths. A mooring line connects an anchor on the seafloor to a floating structure. We will focus on mooring Mobile Offshore Drilling Units and Floating Production Systems.

Why do we use mooring system for an offshore structure?

The mooring system performs the function of station-keeping and is vital to the safe operation of offshore floating facilities.

What is turret in FPSO?

Turret: A cylindrical single point mooring system geo-stationary with the seabed allowing rotation of the FPSO or FSU vessel in response to wave and wind conditions (weathervaning). Weathervaning: Rotation of the ship about the turret in response to wind, sea and climate conditions.

How does FPSO turret work?

FPSO turret (weathervaning) – The turret is integrated into the FPSOs hull, so the hull weathervanes around the mooring system and the mooring line. This enables FPSOs to position the vessel favourably against the wind so that it remains bow to wind and weather.

How do FPSO turrets work?

The turret is moored to the seabed with chains, wires and anchors and has bearings allowing free and unrestricted 360° rotation of the FPSO around the turret (“weathervaning”). The FPSO will normally lay head to the prevailing environment.

What are the components of mooring system?

Mooring arrangements comprise two primary components: mooring lines and fenders. Typical mooring lines in a mooring system are wire rope, fiber rope, and chain. This chapter covers the ropes and chains commonly used in pier-side mooring systems.

What are the types of mooring lines?

There are basically three main mooring line types. A mooring line system can consist of chain mooring lines, wire mooring lines or synthetic fiber ropes or a combination of the three. In shallower water (up to 100 m) the chain mooring line is the most common type of mooring line.

What is spread mooring?

Spread mooring systems are multi-point mooring systems that moor vessels to the seabed using multiple mooring lines. While the vessel is in a fixed heading relative to the seabed, its bow typically heads into the dominant environment which is usually the direction where the largest waves are coming from.

What is turret in ship?

Turrets were weapon mounts designed to protect the crew and mechanism of the artillery piece and with the capability of being aimed and fired in many directions as a rotating weapon platform.

What is 4 point mooring system?

4-Point Mooring System. The Four-Point Mooring System consists of components and hardware necessary to assemble four identical mooring legs. Each leg consists of an anchor, anchor chain, wire ropes, mooring buoy, crown buoy, and rigging hardware.