RENEWABLES Ӏ SECTOR REPORT
Mammoet’s recent offshore
wind projects include the load-in, load-out and transport of jacket structures for Seagreen Offshore Wind Farm in Scotland, and component handling, storage, transport and crane lifting to assemble Hywind Tampen in the Norwegian North Sea, the world’s largest floating wind farm. Mammoet is also supplying
onshore heavy lifting and transport for the staging and assembly of turbine components for Dogger Bank Wind Farm in the UK, and onshore heavy lifting of turbine components in France.
SPEED AND SIZE Liebherr is also focussing on speed and size. Its heavy lift crane HLC 295000 is the largest, and the most powerful, crane the company has ever produced and it has been designed for offshore wind installation.
20 CRANES TODAY
.. and the HLC 295000 at work in the Channel
It has a lifting capacity of up to 5,000 tonnes and a maximum lifting height of 175 metres above deck. It is installed on the specialist vessel Orion and has successfully completed its first offshore projects by lifting a substation platform and installing the largest monopiles ever produced in Europe. The tasks were performed in
the Baltic and the Channel. At the Arcadis Ost wind farm, in the German Baltic Sea, the HLC 295000 was used to install 28 monopile foundations – each up to 110 metres long and weighing up to 2,100 tonnes. A few weeks later vessel and crane set down the 1,300 tonne jacket foundation onto a prepared seabed site for the French Fecamp farm off the Normandy coast and then installed a transformer platform weighing 2,200 tonnes on the foundation. It was particularly important not to lose sight of
the tight schedule in the weather conditions off Normandy – where the Channel and the Atlantic meet; the Orion's good dynamic positional system and the high- precision control of the HLC 295000 were vital here. The Orion is unique in that it
has ability to install monopiles while it is floating. This means that no time-consuming jack- up process, raising the ship on legs up out of the water, is necessary as has been the case up to now. Jack-up vessels have been a requirement for monopile installation; now, it seems, that is no longer the case.
"Our initial experience indicates that the installation times of previous vessels of about 3 to 3.5 days per monopile can be significantly reduced to about 0.9 to one day per monopile with the use of the Orion and our HLC295000," says Robert
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