Hywind Scotland - Assembly and logistics Presented by Hege Eskild NorSea Group

Role in Hywind Scotland Pilot Park

• My name is Hege Eskild, operation engineer in the NorSea Group

project organization

• NorSea Group awarded the base contract for Hywind Scotland

• AS Stordbase will be the used

• NorSea Dusavik was involved with the installation of Hywind Demo

Contents of this presentation

• About the Floating Wind Turbine

• Why assemble onshore

• Scope of work at Stordbase

• Challenges

Size of the Floating Wind Turbine

The Floating Wind Turbine

The FWT consist of

Spar substructure

4 Tower sections

3 Blades

Hub

• Tower section 83 m high, total weight of 668 tonnes

• Blade diameter of 154 m, total weight of 90 tonnes

• Nacelle weight 235 tonnes

• Hub weight 95 tonnes

Why assembly onshore?

• Too large movements on for assembly offshore

• Hywind Demo assembled inshore with barge

and crane

• Size Hywind Pilot Park making inshore

assembly challenging and expensive

Assembly at Stordbase

Location of Stordbase

Scope of work at Stordbase

• Providing a “tool box” for Statoil and other subcontractors

• Quay for offloading parts and equipment

• Storage and transport of all equipment

• Offices and accommodation

• 5 Erection stand for tower and turbine

assembly

• Crane for heavy lifting

• Transport routes on base

• Security

Technical challenges - Erection Stand • For assembly of tower and turbine

sections • Ground investigated will be required

for this construction • 100 year wind requirements • Holes necessary for bottom tower

section guiding pins • Area and placements requirements due

to idling and yaw motions

Technical challenges - The guiding system

• Two guiding pins on bottom tower section

• Guiding pins used for mating lift onto

substructure

• The erection stand must be designed for

these pins, and possible movements of pins

during lift of

• Challenges with this lift:

1. The weight of the turbine

2. Center of gravity if placed forward,

meaning the turbine will tip when lifted

3. Small unforeseen movements can damage

the guide system making the mating

impossible

• All parts transported by vessel

• Ro-Ro and crane offloading

• Main crane necessary for all lifting of

parts

• Use of Self-Propelled Modular

Transport (SPMT)

• Offloading parts at storage without

use of main crane

Technical challenges - Transport and Storage

Technical challenges – Storage and assembly sequence

• Logistics challenges with storage plan and

assembly sequence

• Central storage area close to assembly site

• Assembly sequence in accordance with

assembly sequence

• Area requirements for blade and hub

assembly

• Other considerations: Crane and SPMT

usage, offloading method, transport routes,

etc.

• One big puzzle

• Tower section assembled one by one

• Blades and hub assembled before lift

• Final lift approximately 100 meters high

• Crane cannot crawl during lift

Technical challenges - Tower and turbine erection

And the things you didn’t think of beforehand

• How to install a lightning rod on a 160 meters wind turbine?

• What will happen to the sewage pipes when 300 tonnes crane drives

over them?

• Different operators at the same area, what if someone plans too

construct a building at the same area you plan to use?

• What do you do when the Ministry of Foreign Affairs has reserved all

available floatels due to the current refugee crises?

Questions?