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Depending on the design, a special purpose vessel may be required.Harder to keep stable during transport and installation.Can be used in water depths to 50-60 metres, depending on the characteristics of the location.Can be assembled onshore or in a dry dock.Tension Leg Platform (TLP) Foundations (Fig.3) are highly buoyant, with central column and arms connected to tensioned tendons which secure the foundation to the suction / piled / gravity anchors (Fig.3). 2 Completely Installed Semi-Submersible Platform Foundations by Jochem Tacx Complex fabrication compared with other concepts, especially spar buoysįig.Tends to use more material and larger structures in comparison to other concepts.Tendency for higher critical wave-induced motions.Can be used in water depths to about 40 metres.Transport to site using conventional tugs.Fully equipped platforms (including turbines) can float with drafts below 10 metres during transport.The complete turbine can be installed from shore with the platform moored along the quayside.They are constructed onshore or in a dry dock.The foundation is kept in position by catenary or taut spread mooring lines and drag anchors or suction caissons / suction anchors (Fig.2). The columns provide the hydrostatic stability, and pontoons provide additional buoyancy. Semi-Submersible Platform Foundations (Fig.2) are a number of large columns linked by connecting bracings / submerged pontoons. 1 Completely Installed Spar-Buoy Foundation by Jochem Tacx Needs deeper water than other concepts (>100 meters)įig.Offshore operations (turbine installation) require a heavy lift vessel and can currently only be done in relatively sheltered, deep water.Foundation needs to be upended in in sheltered waters with sufficient depth.Tendency for lower critical wave-induced motions.
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The foundation is kept in position by catenary or taut spread mooring lines with drag anchors or suction caissons/suction anchors (Fig.1). What about the current structures and how do they maintain in place? What are the Pros and the Cons? Spar-Buoy Foundation:Ī Spar-Buoy foundation (Fig.1) is a cylinder with low water plane area, ballasted to keep the centre of gravity below the centre of buoyancy. As the focus on wind energy exploitation in deep water increases, new concepts for deep offshore designs and anchors are likely to be proposed, and so are the respective installation methods.