Feature 1 | DANISH MARINE INDUSTRIES Offshore capacity rises in the wind
A builder is being sought for an innovative 1600tonne jack-up offshore installation vessel for UK/Guernsey registered company gaoh Offshore, whose design demonstrates the market’s appetite for rising liſt capacity.
C
oncept development has been completed for a new, higher liſt capacity offshore installation vessel
for the windfarm market. Design has come from Danish company OSK-ShipTech (formerly Ole Steen Knudsen), which points to high levels of interest in vessels for the growing market niche. OSK has previously been involved in
the development of two smaller vessels for Danish operator A2Sea, which were among the pioneers in turbine installation. Its latest project envisages delivery of the
finished ship by end of 2010 or early 2011. At this stage, the design is for a 140.6m
long DP2 vessel (lpp 135m), 36.2m across the beam, and offering a payload of 4500tonnes (enough for four 3.5MW wind turbines).
Te ship will also be equipped with a
Liebherr MTC offshore crane, able to operate in wind speeds of up to 16m/s. Te crane will offer 1600tonne liſt capacity at a 35m radius, 72m above the water, or 400tonnes at 35m radius, minimum 100m above the water’s surface. Such a capability means that the vessel
will offer capacity more than three times greater than Mayflower Resolution, the first offshore installation vessel built specifically for the offshore windfarm sector, which was delivered in 2004 by China’s Shanhaiguan shipyard to Mayflower Energy. Also of interest is the fact that the new
vessel is to be capable of utilising its crane potential both when jacked up and when afloat. This, OSK-ShipTech points out,
will save considerable time during the installation procedure. Meanwhile, the envisaged vessel’s jack-
up capability is given as 1.5m above the water’s surface at water depth of 45m. Powered by a 14MW diesel electric solution, the vessel will be capable of 12knots and will offer deck loading capability of 10tonnes/m2
. It will offer
accommodation for 122 personnel and be equipped with its own helideck, configured to handle a Sikorsky S61N helicopter. OSK-ShipTech said that the future
challenge in the windfarm installation market would be to develop methods for turbine installation in water depths in excess of 50m. ‘Here, also, OSK-ShipTech is involved in a number of projects,’ said the company. NA
Concept for a new breed of offshore installation vessel, capable of lifting 1600tonnes.
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The Naval Architect April 2008
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