Special Projects
Bremer Lloyd successfully completes nearshore transport for the Wikinger offshore wind park
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Saßnitz served as base port, in which the erector ship was loaded with the pre-assembled rotor blades and towers. Thereby was it the destination for our delivery transports.
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The Wikinger wind park was built 35 km in front of Rügen with 70 facilities.
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The leaves came from Stade and the towers from Aviles in Spain. All 36 trips led through the Kiel Canal.
The wind park Wikinger
The Wikinger wind park of the Adwen company, belonging to the Siemens Group, is currently being built 35 kilometres northeast of Rügen and compromises 70 wind turbines with a total output of 350 megawatts. The wind park costs about 1.4 billion euros and is built by the Spanish utility Iberdrola. After the connection, the wind turbines will supply up to 350,000 households with electricity. This corresponds to about 20 percent of the consumption in Mecklenburg-Vorpommern.
The towers and blades
The supplier transports included
- 210 rotor blades from Stade with a length of 66 meters
- 140 tower sections from Aviles, Spain with a length of 30 meters and a dead weight of nearly 120 tons
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Pre-storage blades
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Pre-assembled rotor stars
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Pre-storage tower sections
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Pre-assembled towers
Transport Concept
The aim was to transport both, the tower sections and the leaves with the same ship, which should alternately call at the port of Stade and Aviles. The choice fell on the “HR Constitution” with 2 x 240 tonnes cranes, which was adapted to the individual transport concept, in accordance with the specifications of the Bremer Lloyd’s engineering department, before the project started. In addition to a multitude of detailed questions, such as the cabotage of the under the foreign flag sailing HR Constitution, the concept includes three key aspects:
- Stowage of three stacking tiers of leaves below deck, although only one intermediate deck was present.
- Speed-up of loading / unloading times by mounting the blade racks in predefined position.
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Avoid welding and ensure conformable weight distribution by using heavy lift platforms for the tower racks.
The entire concept was implemented according to the guidelines of DNVGL Noble Denton. The prescribed cooling times of welds before a test by the MWS was circumvented, by no further welding after the mobilization of the ship.
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Dove tails with sliding twistlock
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Dove tails with sliding twistlock
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Fixed leaf frame
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Stamp as an attachment point for temporary deck
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Stamp as an attachment point for temporary deck
Blade shipment
With the installation of steel columns to create additional intermediate deck positions, the loading capacity could be increased to 12 blades per shipment. In addition, Dove Tails were welded during the mobilization to the future blade frame positions, so that during the loading, the blade frames could be fixed with sliding twistlocks.
In order to stow the third stack of leaves under deck, the original position of the intermediate deck has left out. Instead, stamps were installed at different heights in the ship, on which the intermediate deck platforms were then placed.
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First stack of leaves
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Second stack of leaves
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Third stack of leaves
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Blades on deck
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Hatch 1 as storage space for the heavy-lift platforms with the tower racks
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The heavy-lift platforms could be moved with the welded racks as a unit.
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The heavy-lift platforms were attached with ISO sockets.
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Up to five heavy-lift platforms formed a single unit.
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During blades shipment, the heavy lift platforms in hatch nr. 1 were stored.
Tower shipment
The tower racks were welded on deck on heavy-lift platforms. As a result, a necessary load distribution was achieved. On the other hand, the heavy-lift platforms served as a decisive solution for a quick preparation of the ship for tower transport, while avoiding welding work. Thus, the heavy-lift platforms could be secured to deck by ISO sockets and stored during the blade shipment in Hatch 1.
On the lower deck, the tower racks were once firmly welded to the tank top. During the blades travel, the necessary space was created by folding the tower racks together.
