Second Second turbine transport vessel nears completion
The second of two ships specially designed to transport offshore wind farm components is nearing completion at Holland Shipyards, reports Dag Pike.
Like its sister ship Rotra Vente, launched earlier this year, Rotra Mare has been converted from a container vessel into a heavy lift ro-ro ship that will operate primarily on North Sea routes. Both ships have been commissioned by the Concordia Group and will carry cargoes from Siemens facilities.
Siemens will use both ships for the transportation of mast, nacelles and rotor blades for wind turbines. The two vessels have been specifically designed for the job, with the bow converted into a ro-ro loading ramp and the extensive cargo deck covered by a specially designed detachable roof to protect the cargo from sea water and weather conditions. The roof can slide away allowing cargo to be lifted on and off by crane as an alternative to ro-ro loading and discharge.
The two sister ships are 141m loa with a 20m beam. Remarkable are the specially developed lifting bow and the extendable ro-ro ramp. Both of features are controlled by hydraulic systems to allow for high cargoes to be loaded the entire bow section of the ships is lifted up and aft by the hydraulics to allow a good clearance. It is claimed that the ro-ro loading feature leads to a more cost-effective operation.
Together with the Concordia Group, the work on converting these ships was carried out by Holland Shipyards, which designed and carried out the work on the first vessel, the Rotra Vente in just 10 months. The base vessel used for the conversion was the hull of a container ship.
Both ships feature fully autonomous ballasting and deballasting installation to compensate for loads coming on board or being discharged. Propulsion has been upgraded to match the hull form and required performance criteria to achieve maximum fuel efficiency.
The two ships will operate mainly between Siemen’s turbine construction sites at Hull in the UK and Cuxhaven in Germany to Esjberg in Denmark as well as serving other assembly sites in the Baltic. The Rotra Mare is expected to be in service early in 2017
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