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Yngve Børstad, Project Manager

Subsea Operations Conference 2016 – Haugesund 11.08.2016

Hywind Scotland Pilot Park – Marine Operations

Agenda

2

Introduction to Hywind

Substructure Transport

Operations at Stord

Towing

Operations at Hook-up

location

Other marine operations

Hywind Demo - 2009

Technip fabricated and installed Hywind

DEMO in 2009

Substructure and mooring EPCI

WTG & Tower delivered by Siemens/Statoil

Subsea cable by Nexans

Assembly at Karmøy

..and now we have been asked to do it again

Hywind Demo

Medium park – Hywind Scotland

Technological Focus

Cost Focus

Market Focus

Model test

Concept & theory

Onshore connected parks

2001

2005

2009

2017

The path from idea to commercial concept

Ref.

Hywind Scotland - Project objectives

Test multiple units in park-configuration

Verify up-scaled design

Optimize assembly and installation

Verify reliability and availability of optimized

multi-turbine concept

Mobilize supply chain

5

Statoil: Demonstrate cost-efficient and low risk solutions for commercial scale parks

Hywind Demo Hywind Scotland

Dimension Hywind Demo Hywind

Scotland

Mass 5300 tons ~11500 tons

Hub height ~65 m ~100 m

Draught 100 m ~75 - 80 m

Diameter of sub-

structure

8.3 m ~14 - 15 m

Water depth 220 m ~95 - 120 m

Rotor diameter ~85 m 154 m

Capacity 2.3 MW 6.0 MW

Hywind Scotland – Technip’s Packages

Substructure transport

Upending

Ballasting

Mating

Commissioning

Tow to field

Anchor installation

Hook-up

Deliveries by others*:Substructure Design - Aibel

Substruture Fabrication - Navantia

Tower Fabrication - Navacel

Wind turbine - Siemens

Anchor Fabrication - Global

Mooring Chain - Vicinay/MacGregor

Tower assembly - Norsea Group

Tower mating - Saipem

Umbilical fabrication - Nexans

Umbilical installation - Subsea 7

*Others – with interfaces connected to Techips marine operations

7

5 off Substructures (CPI) from Spain to Stord

Evaluated 2 alternatives

Semi-sub transport

Normal towing

Operational Synergies:

- SPAR technology and transport methods

- Operational analysis

Montecarlo weather simulations indicated 16 days WOW for the towing

VS.

Substructure transport from Spain

9

Length Substructure: 198 m (~220 m incl protruding pipes)

Diameter: 50 m

..coming soon to a harbour near you..

Aasta Hansteen SPAR

VS.

10

Upending by pumping ~5000Te seawater into each substructure

to achieve required draft

Two phases:

Upending

Final ballasting

Operational Synergies:

- Experience from Hywind Demo

- Operational analysis and 3D simulations

Stability simulations performed with

HydroD (DNV Sesam Software)

Static configuration

Dynamic configuration

Substructure Upending at Stord

11

Pre-installed inshore mooring arrangement

Single barge arrangement for pre-mating activities (upending and solid

ballasting)

Optimisation of assembly siteStord

Floating Quay Setup – Phase I

Operational Synergies:

- Local experience from offshore fabrication

- Personnel working at height

- Use of conventional barges

12

Stord Base Location

Issues with current loads on barge and mooring lines

Alternative locations evaluated

Operational Synergies:

- Contact with Havforskningsinstituttet and MET office

- Local experience from Stord

Floating Quay Setup – Phase I - Solid Ballasting

14

Ballasting water to be replaced with

Magnadense rock

Rock installed by Boskalis

Combined rock installation and water

pumping to maintain constant draught

R

O

C

K

Ballast water

15

Tower Assembly & Mating, Stord base

Example of potential location at

Stord

Accommodate mated WTG’s

Commissioning and prepare for towing

Floating Quay Setup – Phase II

17

Analysis of 4 barge solution

Analysis is performed in Diodore

Wind and waves from metocean design basis

Different wind turbulence models used for

calculating the wind forces acting on the wind

turbines

Very high mooring forces are shown, even

before attaching the substructures

4 barge solution considered not viable due to

mooring forces exceeding barge capacity

Operation split to 3 barge solution

Operational Synergies:

- FE Analysis for offshore mooring combined with landbased wind loads

- Internal knowledge of wave and current forces, and tight interface with wind technology

Floating Quay Setup – Phase II

19

Towing to Field

20

Towing spread

4 days tow from Stord to field

Tow analysis in Orcaflex

Tow simulation by Marintek

Survey of the fjord

VIM Concern

Towing test in Trondheim

Tow wire length & chain dimension changed

Less tugs will lead to different vibration modes

Contingency procedures

Operational Synergies:

- Use of Orcaflex for towing simulations

- Experience from towing Hywind Demo and Spars

Towing to Field

21

Anchor installation

Pretensioning of anchors and chains

Final hook-up with MacGregor Pusnes Fairlead Chain Stopper system

Hook-up – mooring systems

Operational Synergies:

- Anchor design and selection method

- AHV chain operations by experienced subcontractors

22

Umbilical installation

Operational Synergies:

- Conventional lazy wave configuration for umbilical installation

- Landfall drilling experience

23

www.technip.com

Thank You