Subsea loading—minimal maintenance, maximum efficiency
Subsea loading systems are designed for a 25-year service life. The subsea position means that the system avoids much of the environmental impact and motion that other more conventional systems are subjected to. Moreover, the loading hose is never in contact with the seabed. Consequently, the system needs minimal maintenance.
Uninterrupted loading during commissioning
The configuration of the system means that it requires no modification for use with existing tanker fleets, and it can be positioned in close proximity to any existing loading system. This feature allows both the existing and the new system to operate in parallel, so that oil exportation is not interrupted during field testing and commissioning.
Ideal for medium-depth to deepwater applications, the system is fully piggable and allows diverless replacement of all critical components. Systems for shallow water are also available.
The loading system consists of a riser base, a rigid riser, a buoyancy tank with swivels and a loading hose, and a pickup system for the loading hose.
The riser base contains couplers for two flexible flowlines, together with valves and a control system for communication with the platform. The riser has a flexible joint at the lower end and is held in tension by the buoyancy tank. A swivel stack system is placed on top of the buoyancy tank, allowing the loading hose and shuttle tanker to weathervane freely.
The buoyancy tank is located below the surface of the sea. The pickup system is attached to the end of the loading hose and connected to a marker buoy on the surface that can be picked up by the tanker for connection of the loading hose.