Post on 06-May-2018
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Rampion Offshore Wind Farm Offshore Work Packages
Meet The Buyer Naren Mistry, Engineering Manager 26th Feb 2014
Rampion Offshore Project Scope
Design, manufacture, transportation and Installation: � Up to 175no. Wind turbines � Up to 177No. Foundations � Up to 230km Array cables � 4No. Export cables � 2No. Offshore Substations
Bathymetry & Geotechnical Investigation
Offshore Geotechnical contract: Aug 13 – Apr 14 • 183 Boreholes and Cone
Penetration Tests (CPT) • Export cable route survey • Extensive Lab testing • Modelling site by combining
Geotechnical and Geophysical survey results
Subsea Geology
- Geologically complex site - Variety of clays, sands, chalk, etc - Paleochannels
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Electrical system schematic
O&M Building Quayside
Crew Vessels Jackup-Vessels
Offshore Substation
Array Cable
Foundation
Wind Turbine Generators
Export Cable Onshore Substation
Grid
Transition Piece
Breakdown of Offshore Contract Packages - 1 � Wind Turbines 1. Design, manufacture, pre-assembly, commissioning 2. Installation: MPI Charter vessel plus installation contract
� Monopile Foundations 1. Front end engineering design (FEED), basis of design (BOD), Detailed
Design - Consultancy Contract awarded 2. Fabrication Contract(s) – monopiles and transition pieces fabrication (inc
transportation) 3. Installation: Foundation Vessel Charter (inc installation) � Jacket Foundations 1. Competitive FEED and Tender Proposal – Jacket fabricators 2. Detailed Design, fabrication & transportation – Jacket fabricator 3. Jacket Installation: Foundation Vessel Charter (inc installation) 4. Pin Pile installation: Possible small jack-up contract
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Breakdown of Offshore Contract Packages - 2 � Export Cables 1. Preliminary Design/FEED: In-house 2. Design & Supply: Supply contract 3. Installation: Cable vessel charter (inc transportation & installation) � Array Cables 1. Preliminary design/FEED: In-house 2. Design & Supply: Supply contract (inc cable protection system) 3. Transportation: Barge contracts 4. Installation: Cable vessel(s) charter (inc installation)
� Offshore Substations Topsides (inc substation foundations) 1. FEED & BOD – Consultancy contract awarded 2. Design, fabrication, electrical installation, transport - Fabricator 3. Installation: Heavy lift crane vessel charter (inc installation services) 4. Supply of electrical equipment by the onshore substation EPC contractor
(inc installation & Commissioning)
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Foundation types
• Variability of ground conditions & water depths
• Monopile and jacket foundations (most commonly used to-date)
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Installation of monopile foundations
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Wind Turbine Transport & Installation MPI Discovery
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Turbine Tower Installation
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Turbine Nacelle Installation
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Turbine Blade Installation
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Offshore Substations
� Electricity produced by the turbines is
transmitted by subsea array cables to the offshore substations
� Substations house the high and medium
voltage electrical components for transformation of the 33kV voltages produced by the wind turbines to 150kV export voltage
� Two export cables transmit the electricity from
the substations to the shore � Substations also house control rooms,
emergency accommodation and workshops
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Installation of offshore substation topsides
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Marine Export Cables
Export Cables • The marine export cables will connect the offshore substations the landfall point. • Three core 150kV cables with fibre optics.
Export Cable Installation • Cables will be laid and ploughed to burial depth approx 1.5-2m below the sea bed.
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Array Cables
Array Cables • Connect the wind turbines to each other and to the offshore substations. • 150mm2 (33kV) and 500mm2 3 core submarine cable. Array Cable Installation • Cables are loose laid on seabed and pulled into the transition piece through external j-tubes or internally thorough holes in the monopiles • The cables are buried by jetting or ploughing techniques. • All cables will be buried at a target depth of 1.5m under the sea bed.
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Installation Vessels MPI Adventure A2 Sea Seaworker
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Installation Vessels Ballast Nedam HLV Svanen
Offshore construction supply chain opportunities � Major offshore construction activities over a two year period to install and
commission the wind turbines, foundations, subsea cables and offshore substations
� As well as the major installation vessels, many smaller vessels will be required, e.g. guard boats, etc
� Ancillary and support services for installation vessels. e.g bunkering, etc
� Specialist services for offshore works, e.g. diving services, etc
� Experience on other projects shows local suppliers will be required to support construction base activities, e.g plant hire, etc
� Further details of the offshore contracts and potential opportunities in the afternoon ‘Offshore Balance of Plant’ focus group
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Thank You