Offshore Work Packages

Transcription

1 Rampion Offshore Wind Farm Offshore Work Packages Meet The Buyer Naren Mistry, Engineering Manager 26 th Feb 2014

2 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

3 Bathymetry & Geotechnical Investigation Offshore Geotechnical contract: Aug 13 Apr Boreholes and Cone Penetration Tests (CPT) Export cable route survey Extensive Lab testing Modelling site by combining Geotechnical and Geophysical survey results

4 Subsea Geology - Geologically complex site - Variety of clays, sands, chalk, etc - Paleochannels

5 Electrical system schematic Wind Turbine Generators (Resolution) Transition Piece Foundation Array Cable Offshore Substation Export Cable Crew Vessels Jackup-Vessels Quayside O&M Building Grid Onshore Substation 5

6 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 6

7 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) 7

8 Foundation types Variability of ground conditions & water depths Monopile and jacket foundations (most commonly used to-date)

9 Installation of monopile foundations 9

10 Wind Turbine Transport & Installation MPI Discovery 10

11 Turbine Tower Installation 11

12 Turbine Nacelle Installation 12

13 Turbine Blade Installation 13

14 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 14

15 Installation of offshore substation topsides 15

16 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. 16

17 Array Cables Array Cables Connect the wind turbines to each other and to the offshore substations. 150mm 2 (33kV) and 500mm 2 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. 17

18 Installation Vessels A2 Sea Seaworker MPI Adventure (Resolution) 18

19 Installation Vessels Ballast Nedam HLV Svanen (Resolution) 19

20 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

21 Thank You 21