‘Brave Tern’ stretches its legs
Wind turbine installation vessel ‘Brave Tern’, owned by Norwegian Fred. Olsen Windcarrier, recently dominated the Rotterdam skyline. The 132-metre-long ship was jacked up to a height of about 70 metres to test its newly modified legs.
The vessel has four jacking legs with which it can position itself firmly on the seabed. The four legs of the Brave Tern were extended in length by fourteen metres each, up to 92.4 metres, during recent weeks in Rotterdam.
The upgrading of the jacking legs of the Brave Tern was executed by Franklin Offshore Europe in Rotterdam in close co‐operation with SRC from Estonia. Also the frame and the boom of the ship’s crane have been extended, in total by 20 metres. The crane is now capable of lifting up to 120 metres above the deck.
The modifications of the 2012 built vessel are necessary as wind turbines become heavier and the blades of the rotor blades become larger. Also wind farms are installed in deeper water more often. Sister vessel Bold Tern will get the same upgrade later this year.
The vessel is now capable of carrying four complete ‘multi megawatt’ turbines, including towers and rotor blades. The vessel can operate in water depths up to 60 metres.
The Brave Tern’s first job following the upgrades will be a maintenance operation in the North Sea, before heading to the US east coast where it will assist in the construction of the first US offshore wind farm.
By Jake Frith
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