SWATH design for windfarm service vessel
To meet the anticipated demands for access to wind farm installations in more adverse conditions Ad Hoc Marine Designs has developed designs for a SWATH service vessel that is claimed to offer better transit performance and access in challenging sea conditions.
Named the Typhoon Class SWATH this vessel design is claimed to provide operators with a viable alternative to ordering larger vessels for servicing requirements
Ad Hoc said that a SWATH design was selected to ensure that motions during both transit and transfer operations are sufficiently low to prevent seasickness and fatigue in the higher sea states. “The next round of wind farms and the future vessel requirements for higher wave height and being longer at sea is due to wind farms being placed further out to sea.” said John Kecsmar, a naval architect from Ad Hoc Marine Designs.
The 41m walk-to-work capable crew transfer vessel has been designed to run in significant wave heights of up to 3.5 metres and has been developed from experience with the 26 metre MCS SWATH 2 also designed by Ad Hoc and which is in service with Maritime Craft Services (Clyde) Ltd.
This Typhoon Class design will be powered by four CAT 3512C diesel engines which are rated at 1678kW each. This is claimed to give the vessel a transition speed of 25 knots. Ad Hoc commented, “By running on just one or two of the engines when located at the facility or just the gensets when in hotel mode for long extended periods, operators can reduce fuel consumption.” The new design will have the capability of remaining at sea for up to two weeks at a time and provide accommodation for up to 24 technicians in their own individual cabins. It is also capable of carrying any combination of 4 ISO containers.
The vessel will be equipped with Island Engineering’s zero heave mode built-in to the motion control system. Ad Hoc says that this will ensure that the whole vessel is ‘heave damped’ and does not require any heave dampened gangway for transfers. The advanced SWATH hull form is designed to give 50% reduced coupling, 20% increased damping and an increase in displacement that is tailor-made for the wind farm market. This has resulted in the ability to maintain service speeds of 25 knots in 2m significant wave height with extremely low motions.
This new design will be offered for building by Aluminium Marine Consultants with construction in aluminium and will also be available as the basis for patrol vessels and ferries. Ad Hoc also has a slightly smaller 33m Typhoon Class SWATH that is a more compact version of the 41m. This has accommodation for 12 technicians and an endurance of up to two weeks offshore.
By Dag Pike
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