Platform installed without heavy lift crane Founded on Suction Piles with Unbraced Legs Suited for water depths up to 50 m Suited for deck weights up to 10,000 mT Re-usable and easy decommissioning No piling, hence no distraction to marine life SIP2 - Barge Installed Platform
SPT Offshore recently installed the Centrica F3-FA platform
SIWT Self Installing Wind Turbine Installed in one piece Standard marine equipment, e.g. flat barge & tugs and suction pumps Braced mono-pile foundation 3 No. suction piles ballast on 2 No. piles Water depths up to 60 m Suited for large >5 MW turbines Suited for wide range soils SIWT has been selected for the Carbon Trust OWA next generation foundations competition. The design of the SIWT has progressed to a de-risking stage. Next steps will be scaled model testing in basin and detailed design for demonstrator project.
1. lift suction piles on to temporary foundation in harbour basin 2. Lift tripod and place on top of suction piles and secure tripod to suction piles (Grouted connection). Assembly sequence: 3. Assembly and commissioning of wind turbine generator 1 2 3
SIWT Self Installing Wind Turbine 4. Pick up of complete wind turbine by the transport and installation barge and seafasten for offshore installation 4 5 5. Sail to location 6. Lowering wind turbine to seabed and install suction piles 6
SIWT Self Installing Wind Turbine New Technology?
SIWT Self Installing Wind Turbine Features Standard marine spread Low spread dayrate No noise no distraction to marine life Re-usable & completely decommissioned Proven technology tripod design suction pile foundation Short cycle time < 3-4 days High workability Quick return on investment Patented
Supply chain considerations Mast, nacelle and blades Tripod Assembly site Modular system: Less dependent on single fabricator Outsourcing of elements Lighter lifts lighter equipment More suitable ports/yards
T&I: marine spread Heavy duty Transport & Installation barge, equipped with: Lifting/lowering system Grillage Ballast system Mooring winches Suction pump spread Crawler crane Accommodation etc Tugs (2 x 90tbp) Suction pumps (3x) ROV, diving (contingency) and survey from barge
T&I: workability Transport Design seastate Hs = 4.0m low roll response during extreme seastates Roll (T=16 s) and pitch (T=12 s) natural period high Maximum acceleration nacelle = 0.5 g for Hs 4.0 m Installation/lowering Design seastate Hs = 1.5m
T&I: workability Transport : Design seastate Hs = 4.0m