Protecting Single Point Moorings - Gall Thomson

Protecting Single Point Moorings

Protecting Single Point Mooring Terminals and reducing risk of spillage

Reducing the risk of damage to SPM underbuoy hoses, PLEM (Pipeline End Manifolds) and submarine pipelines with the Gall Thomson range of Underbuoy Breakaway Couplings

Gall Thomson UBC activation SPM








Gall Thomson Underbuoy Breakaway Couplings minimise the consequences of an extreme event

The Gall Thomson Underbuoy Breakaway Coupling is designed not to activate due to cyclic fatigue, bending moments or torsional stresses caused by the motion of subsea currents.

The UBC is designed to activate when its pre-set parting load is exceeded. Excessive axial load may be caused by the anchor chains being broken and the SPM being forced beyond its designed envelop, therefore applying excessive load to the underbuoy hose string. This can be caused by vessel collision or some other extreme event such as tsunami, hurricane or other event.

When the UBC activates, the valves close. Closure of the valves stops product flow and minimises spillage; activation of the coupling allows the SPM to be outside its designed envelop without causing damage to the underbuoy hoses, PLEM (Pipeline End Manifold) or submarine pipeline.

Underbuoy Breakaway Coupling typical system applications

Floating hose strings at Single Point Mooring (SPM) Catenary Anchor Leg Mooring (CALM)/ Single Anchor Leg Mooring (SALM) buoy terminals.

Minimum product outflow following activations has been confirmed
by all 250 successful Marine Breakaway parting incidents to date.

Gall Thomson MBCs are the global Industry Standard

Terminals around the world employ Gall Thomson MBCs as part of their underbuoy systems. These include a range of sizes, configurations and applications.