OFFSHORE & SUBSEA | APPLICATION REPORT
Q SAL’s Orca-class vessels are fitted with 800t Liebherr cranes
logistics market for increased efficiency in smaller ports in newly developed offshore wind areas,” says Cees van Veluw, product manager Cranes at Huisman. “The traditional use of crawler cranes or multiple smaller quayside cranes would require a very large backyard. It also requires the transport vessel to be moored along the quayside for an unnecessarily long time. With this crane, offshore wind ports can be ready for a quick load-out of turbine components in a sustainable manner.”
SHIPS
diameters up to 236 metres, compared to 158-metre-average rotor diameters in 2021. Costs per megawatt are coming
down. As an example, in September this year (2022) Seaway Heavy Lifting and Sif completed the installation of all 140 monopile foundations at the 1.5 GW Hollandse Kust Zuid farm in the Dutch North Sea; and a little earlier, in August, the first electricity from the farm flowed into the Dutch national grid. The farm is notable as the world’s first subsidy-free offshore wind farm. The lesson from that is that development costs of offshore technology have been largely amortised, and installation methods and efficiencies are such that offshore wind farms can now generate profits as well as power.
TECHNOLOGY For the lifting technologies of offshore wind let us start at the water’s edge where towers and blades are loaded onto their
transport ships. In July this year Huisman unveiled a new Travelling Quayside Crane specifically for the load-out of offshore wind turbine components. Current methods, say Huisman, involve
crawler cranes, or a tandem-lifting by two cranes with a capacity around 200t to 300t. With its 700t machine the load-out process of offshore wind turbine components can take place significantly faster. It is fully electric, with a direct connection
to the quayside grid and feeding regenerated energy (from lowering the load) back into it, which reduces the net energy consumption of the crane. It travels on tracks 16m apart, though this can be adapted for narrower quays. The boom is 57m; lifting 700t at a radius of 25m it is designed to bring turbine components to any place in the hold of the majority of the cargo vessels currently used for turbine transportation. “We see a need in the offshore wind
Maritime heavy lift and project cargo carriers SAL Heavy Lift, with its partner Jumbo Shipping recently (September 2022) signed building contracts for four new generation heavy lift ships, with options for two more. The first two ships will be exclusively used for transportation of offshore wind turbine components. The ships, called the Orca class, are to be built in China. “They set the new benchmark in global heavy lift shipping” says Dr Martin Harren, owner and CEO of SAL Heavy Lift and the Harren Group. Ultra-efficient and with carbon-neutral
potential, “they will be the most efficient vessels in their class with consumption and emission figures far superior to any existing heavy lift vessel today. The group has committed to the decarbonisation of shipping activities by 2050 and the order, is significant, concrete action towards that.” The vessels measure 149.9 m x 27.2 m
and provide a capacity of 14,600 dwt. Each vessel is fitted with two 800 t Liebherr
R MacGregor cranes will be fitted to Van Oord’s new generation vessels 42 | November 2022 |
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