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European Offshore Wind 2009

Conceptual Foundation Study for Kriegers Flak Göran Loman, Vattenfall Thomas Stalin, Vattenfall Helge Gravesen, Grontmij | CarlBro. European Offshore Wind 2009. or A Marathon race in 15 minutes. Participants in the project. Ballast Nedam Cowi GrontMij|Carlbro ISC AS MT H ø jgaard

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European Offshore Wind 2009

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  1. Conceptual Foundation Study for Kriegers Flak Göran Loman, Vattenfall Thomas Stalin, Vattenfall Helge Gravesen, Grontmij | CarlBro European Offshore Wind 2009 or A Marathon race in 15 minutes

  2. Participants in the project • Ballast Nedam • Cowi • GrontMij|Carlbro • ISC AS • MT Højgaard • MT Piling • Per Arsleff AS • Pihl & Søns AS • Rambøll • SGS • Skanska • Vattenfall Financed by Vattenfalls project Kriegers Flak Wind Farm and by the Swedish Energy Agency

  3. Vattenfall Windpower Vattenfall • Owned by the Swedish government Activities • Today • DK, FI, DE, NL, PL, SE, UK, • 2 TWh/a • One of the leading generators in the Nordic countries • Significant share of the world offshore market • Development • Seven ongoing large projects under construction • Several under development • Goal • Climate neutral 2050 (Vattenfall group)

  4. Kriegers Flak Wind Farm • 30 km south of Trelleborg • 17-40 m water depth • 128 plants • Each 5 MW • 2.6 TWh/y

  5. Aims Evaluate existing kinds of foundations Develop more cost efficient concepts Project development Open seminar in February 2008presentation of concept Some ten consultants and contractors where engaged The experts work with design Evaluation of fabrication, installation, costs Adjustments and final design Final presentation at EOW Final report The scope of work Regular meetings where the concepts where discussed and evaluated

  6. Actual site assessment was used • Geotechnical surveys • Fino2 • Hydrographic measurements

  7. The concepts • Foundations • Steele monopile • Steele quadroped • Concrete gravity • Concrete gravity tripod • Concrete monopile • Sea bed preparation robot

  8. Steel monopileRambøll and MT Højgaard • Conventional design • Suitable conditions for monopile • Drilling needed where boulders occur • 3.1 M€ (35 m, 5 MW) • More compatible at shallow depth • Limited storage area needed

  9. Steele quadropedRambøll and MT Højgaard • Design • Concrete transition piece • 2 levels of X-braces • Less wave load • 3.0 M€ (35 m, 5 MW) • More competitive at deeper water • Possibilities for further optimisations

  10. Steele quadropedInstallation

  11. Concrete gravity Cowi and Aarsleff • Three designs • Conventional cone • Floating (KIS) • Semi floating • Conventional • Cost effective, 2.4 M€ (35 m, 5 MW) • Durable and robust • Maintenance friendly • Heavy lifting floating cranes • Floating • The floating concept need more concrete and deeper harbour • KIS 4 M€, semi floating 3 M€ • No heavy lifting floating crane • Could be improved

  12. Concrete gravity triopod ISC and Skanska • Design • Three legs, triangular shape • Standardised parts • Prefab elements, in situ casting • Total installation concept • Heavy (>3,000 tons) • Expensive 3.8 M€ (35 m, 5 MW) • Need to be improved

  13. Concrete monopileBallast Nedam and MT Piling • Design • Prefab concrete monopile • Vertical drilling • Concrete • Less expensive than steel • High fabrication capacity • No uw noise or vibration during installation • Unproven technique (or?) • 3,1 M€ (5 MW, 40 pc) • 2 M€ for 130 pc

  14. Stone bed preparation robot, Pihl • No divers needed • One stop for • Soil investigation (vibro cores, CPT) • Final levelling of the sea bed • Surface measurements • Creating the stone bed (fall pipe)

  15. Several interesting concepts were evaluated and improved There is a potential for further optimization Need to iterate with turbine suppliers Summary The foundations, you don’t see them, but you need them!

  16. More information: www.vattenfall.com/kriegersflak Kriegers Flak Wind Farm

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