Oceans of knowledge

Conventional Buoy Mooring (CBM) system

The Conventional Buoy Mooring (CBM) system includes multiple buoys that are fixed to the seabed by means of mooring lines and marine anchors. The three to six buoys are permanently installed in a rectangular pattern that allows safe mooring of a vessel which is positioned between the buoys with tug assistance.

The buoys provide the strong points to which the vessel’s on-board mooring lines can be attached. These are the same lines that are also used for mooring the vessel along a quay.

The CBM system is especially valuable when no quay sites are available. It can also be combined with a fluid transfer system that enables connection of (subsea) pipelines to the midship manifold of a conventional tanker. When no tanker is moored, the submersible hose or hoses are stored on the seabed. For cryogenic fluids, the aerial hose is suspended from a tower to the midship manifold of the liquefied gas carrier.

Some mooring buoys are off-the-shelf products, while others have been specially designed to include features like quick disconnection couplings. The mooring system and layout of the buoys are always specifically designed to match the vessel’s requirements and local environmental conditions. Typically these systems are designed for nearshore applications with water depths starting from six metres.

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