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• W2084834860 abstract "ABSTRACT Existing systems for mooring offshore oil production vessels of the ship type only permit the mooring or tying up of the vessel in quite lowwave conditions. Virtually all existing systems do not permit the vessel to moor in wave conditions exceeding H. = 4.5 m. Most systems require wave heights smaller yet to moor. This is a problem in cases where frequent mooring operations are required such as for shuttle tankers and for disconnectable oil production or storage vessels moored in areas with a high incidence of tropical storms. The wait for the waves to subside following the storm causes additional production losses due to the oil field being shut in. A newly developed mooring system, the suction mooring, promises to overcome this problem by permitting the mooring of the vessels in wave heights to at least H= = 8 m. The principle of the mooring consists of using the hydrostatic pressure available at the keel of the vessel to press a mooring buoy onto the bottom and holding the vessel by the resulting friction. The action of the mooring buoy is similar to that of a suction cup. The pressure above the buoy is lowered and maintained low by means of pumps aboard the vessel. This paper reports on model tests carried out to prove the feasibility of conducting the mooring operations in high waves. Three different configurations of the mooring buoy were tested. For two of the configurations it was found that the mooring process could be carried out safely in all wave heights tested i.e. up to H. = 7.7 m. The impact upon offshore operations of this capability was investigated by performing Monte Carlo simulations on a hypothetical oil field in the center North Sea and in the northern North Sea. An actual center North Sea wave record was used in the simulations. The suction mooring system was compared to two other high performance mooring systems. The results show that weather related oil field shut-ins re reduced an order of magnitude by application of the suction mooring compared to the other systems simulated. MOORING PRINCIPLE The suction mooring principle involves mooring a submersible buoy to the bottom of a vessel utilizing differential hydrostatic pressure, in a manner similar to a suction cup. A mooring buoy is brought into contact with the flat portion of the bottom of the ship either by means of a retrieval line such as commonly usedfor the Buoyant Turret Mooring (BTM) and Submerged Turret Loading (STL) type mooring or by means of reduced buoyancy utilizing a system aboard the buoy to control the buoyancy. The reduction in hydrostatic pressure above the buoy is provided by pumps aboard the ship. A bow thruster pump of the Omni-thruster or the Elliott Turbo Machinery type having its intake at the keel in the mooring area is used to achieve the initial pressure reductions. This type of pump has a capacity from 4 to 11 m 3 /sec." @default.
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• W2084834860 date "1995-05-01" @default.
• W2084834860 modified "2023-09-26" @default.
• W2084834860 title "The Suction Mooring, A New Type of Offshore Single Point Mooring" @default.
• W2084834860 doi "https://doi.org/10.4043/7711-ms" @default.
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