Next generation WTG foundation and WTG installation

WindDays – Rotterdam, 14 June 2018

Arnoud Bosch – Engineering Director

18 June 2018

Subsea 7 Business Units

Life of Field: For more than 35

years we have provided clients

with inspection, maintenance and

repair (IMR) services, integrity

management and remote

intervention

SURF and conventional: We are a global market

leader in the Subsea Umbilicals, Risers and Flowlines

(SURF) sector. Most SURF projects are contracted on

a fixed-price basis and involve Engineering,

Procurement, Installation and Commissioning (EPIC)

services.

Renewables and Heavy Lifting: We are

experienced in the installation of offshore

wind farm foundations and substations,

heavy lifting for oil and gas structures and

decommissioning.

i-Tech Services

Subsea 7

Seaway Heavy Lifting

Siem Offshore Contractors

10-Aug-17

Subsea 7 Renewables and Heavy Lifting Vessels

Oleg Strashnov (2011)5,000 Tonne DP Crane Vessel

Siem Moxie (2014)DP installation & commissioning support vessel

Stanislav Yudin (1985)2,500 Tonne Moored Crane Vessel

Siem Aimery (2016)DP Cable Lay and Trenching vessel

Seaway Heavy Lifting

EMPLOYEES

Onshore / offshore: 550

HEADQUARTER

The Netherlands (Zoetermeer)

HOME PORT

SHL facilities (Europoort, Rotterdam)

OFFICES

Germany (Hamburg)

United Kingdom (Glasgow, Aberdeen)

France (Paris)

USA (Houston)

Cyprus

Taiwan

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5

Beatrice EPCI

ScopeSeaway Heavy Lifting (EPCI)

• 84 Foundations

• 91Array Cables

• T&I of 2 Substations

Siemens Transmission

• EPC of 2 Offshore Substations

• EPCI of Export cable

Siemens Wind Power

• EPCI of 84no WTG

Key interfacesEngineering

• Atkins

Fabrication

• Bladt (Jackets)

• Smulders (Jackets)

• Bifab (Jackets)

• EEW (Piles)

• SIF (Piles)

Cables

• SIEM

Transport & Installation

• Seaway Heavy Lifting

Beatrice EPCI – Pile Installation Frame (PIF)

- SHL in-house designed PIF

- Successfully installed 344 piles within tolerance

- Extendable mud mats to level PIF

- Retractable shims in sleeve to allow hammer

sleeve in PIF sleeve

6

Beatrice EPCI – Riggerless installation of Beatrice jackets

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8

Borkum West II

ScopeSeaway Heavy Lifting (EPCI)

• 32 Foundations

• Scour protection

Senvion

• EPCI of 32no WTG

Key interfacesEngineering

• JBO (steel parts)

• Recase (e-module)

Fabrication

• SIF

• Smulders

Scour Protection

• Tideway

Transport & Installation

• Seaway Heavy Lifting

Borkum West II – MP-TP seal

- Bolted connection MP-TP

- No mini skirt with grout for corrosion protection interface MP-TP

- Inflatable seal to ensure air and water tight interface

9

Monopile installation

10

MP installation: Adopt – Adapt - Improve

18 June 2018 11

Greater Gabbard 2009

- Simple outrigger with fenders

- Manually controlled cylinders

to improve verticality of MP

Dudgeon 2016

- Motion compensated

cylinders

Borkum II 2018

- Outrigger 7m elevated to

improve stability for larger MP

- Noise mitigation screen

integrated in outrigger

Next step: MP installation on DP

Critical stages during MP installation on Dynamic Positioning:

1. At low penetration level, the pile may lean on the vessel, so the DP system must be capable of

supporting the pile

2. At intermediate penetration, the DP system must be capable of

supplying force to correct pile verticality within specified tolerance.

3. At stable/full penetration, the pile acts as a mooring pile.

Does a moored connection destabilize the DP control system?

18/06/2018

Next step: MP installation on DP

- Outrigger control model (MATLAB-Simulink) has been completed by Bosch Rexroth

- DP simulation model has been developed with RH Marine

- Coupled system of outrigger control model and DP simulation model

Conclusion:

- A coupled outrigger-DP system is required to ensure safe MP installation on DP

- The simulation results have been verified with the data we have measured during Dudgeon MP

installation. This has shown very similar results justifying the accuracy of the model.

13

Coupled simulation Uncoupled simulation

MP on DP installation using Monopile Installation Frame

18 June 2018Title Presentation 14

MP on DP installation using Monopile Installation Frame

- Basic design MIF finished

- Proven concept

Similar concept as inhouse SHL designed

Pile Installation Frame (PIF) as used

on Beatrice project

- Integrated noise mitigation

system feasible

15

Source: Vuyk Engineering

Future WTG’s – lifting height challenge

Wind Turbine Generator installation from floating vessels

- SHL leading the Carbon Trust study on

floating installation of WTG’s

- Different concepts being studied

- Adjustments to WTG tower / nacelle / blades

required to facilitate installation

- Methods for separate installation of blades

being studied

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2 3

Slip joint connection MP-TP-WTG improving floating installation

18/06/201819