Offshore Windpark DanTysk - kiwi-kiel.de · Kieler Branchenfokus Windindustrie | 2015.02.03...

. Kieler Branchenfokus Windindustrie | 2015.02.03

Offshore Windpark DanTysk

Cost-Effective Foundations

Design to Installation

Kieler Branchenfokus: Winindustrie – 3.2.15

Confidentiality - None (C1) - Olaf Beeg Package Manager Civil Works DanTysk


Confidentiality -

Vattenfall‘s Offshore Pipeline

• Onshore: 71,8 MW

• Offshore: 540 MW

• Estimated annual production: 1,847 GWh

United Kingdom

Onshore capacity: 720 MWTOTAL Offshore capacity: 1122 MW

Production: 5,213 GWh

Vattenfall shared

• Onshore: 274 MW

• Offshore: 54 MW

• Estimated annual production: 449 GWh

The Netherlands

• Onshore: 12 MW



Germany

• Onshore: 249 MW

• Offshore: 96 MW


Denmark

• Onshore: 113 MW



Sweden

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Confidentiality -

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Vattenfalls Offshore Pipeline in Germany

• More than 1.500 MW

installation potential for

offshore wind farms in

the German North Sea

• Different development

stages

• Next project to come:

Sandbank (288 MW)



Confidentiality -

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DanTysk – Foundations: From design to installation

Table of contents

1. Project overview

2. Foundation design

3. Foundation installation

4. Grouting

5. Noise mitigation



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1) DanTysk – Project overview

Project Set-up and current status:

• Joint venture with Stadtwerke

München (49%) und Vattenfall (51%)

• Vattenfall has the lead in construction

and operation

• Project permit granted 2005

• 80 sites

• located ~70 km west of Sylt

• 90 km (~ 50 nm) to Esbjerg

• Water depth 21 - 32 m

• area 71 km²

• grid access granted (sylwin 1)

• Construction start 2013



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1) DanTysk – Project overview: Wind Turbine Generator

What:

• 80 x SIEMENS 3,6 SWT 120

• -> 288 MW

• Energy yield more than 1,3 TWh/a

Siemens Wind Power



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1) DanTysk – Project Overview: Instal. Vessel for WTG

What:

• “Pacific Osprey”Purpose build Jack-up vessel

• SWIRE Blue Ocean

• 6 legs, load capacity of 12 complete sets of WTG

SWIRE Blue Ocean



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1) DanTysk – Project Overview: Offshore Substation

What:

• Offshore sub-station with jacket-

structure 33/155 kV

• Strukton/Hollandia to design,

manufacture and install

• Installation done with Seaway Heavy

Lifting “Oleg Strashnov” August 2013



Confidentiality -

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1) DanTysk – Project Overview: Inter Array Cable

What:

• 120 km cable incl laying, pull-in and

burial

• Van Oord Dredging and Marine Contractors + Visser & Smit Marine

Contracting

• 3 cable dimensions, ring connectionVan Oord



1) DanTysk – Offshore Accommodation Platform (OAP)

What:

• Accommodation for 50

service technicians

(DanTysk & Sandbank)

• Nobiskrug to design,

manufacture and install

• Bridge connection to OSS



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1) DanTysk – Project Overview: Foundations

What:

• 80 monopiles and transition pieces installed

• Aarsleff/Bilfinger Berger joint

venture(ABJV)

• Installation by Seafox 5

• Finalized 13.12.2013

ABJV



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2) DanTysk – Foundations: Design

2.1) Design Basis / environmental conditions

Simple principle: Design drivers are always cost drivers

⇒ LEC reduction by smart engineering!

Main design drivers at DanTysk:

• Design Basis / environmental conditions: Soil, waves, wind, turbine loads

etc.

- Re-arrangement of park layout => Shift locations based on

geophysics, electrical/cable needs, wind yield

- New scour protection concept => Less rock dumping + more

monitoring

• Load iteration turbine � foundation

• Grouted connection

• Secondary steel / EquipmentABJV



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2.2) Load iteration turbine �� foundation

3 clusters; dependent on water depth and

reference waves

⇒ 1 conservative virtual location per cluster

(worst soil combined with deepest water)

⇒ 2 load iterations with Siemens => after

load results: check of loads at upper

bound (stiffest soil combined with lowest

water depth)

⇒ One interface load per cluster =>

detailed calculation of all locations in

cluster

Reference location cluster SCOWI/IMS

N

M

M

M

S



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2.3) Grouted connection

Basic principle:

⇒ Cylindrical

⇒ Shear keys (weld beats)

⇒ horizontal and vertical

⇒ ZiE process based on German principles

⇒ Grout volume ~ 21 m³

⇒ Grouting temperature > 5°

Conservative design! => minimize risks!

COWI/IMS



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3) DanTysk – Foundations Installation

3.1 ) Installation Timeline - general facts

Step Planned time Real time (average)

Positioning / Jack up 3 h 3,0 h

Upending /placing pile 3 h 6,1 h

Positioning hammer 1 h 0,8 h

Drive pile 3 h 1,9 h

Remove hammer 1 h 0,5 h

Lifting TP + adjusting 2 h 1,6 h

Grouting 5 h 5,0 h

Seafastening crane 1,5 h 1,7 h



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3) DanTysk – Foundations Installation

27,00

29,00

31,00

33,00

35,00

37,00

39,00

41,00

43,0000:14:24

00:28:48

00:43:12

00:57:36

01:12:00

01:26:24

01:40:48

01:55:12

02:09:36

02:24:00

02:38:24

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

Ein

dri

ng

tie

fe [

m]

Ne

tto

Ra

mm

zeit

[h

h:m

m:s

s]

Fortlaufende Monopile ID

Netto Rammzeit

Eindringtiefe

Piling timeline - all locations

2,0 h 30m

1,5 h

=> starting MP 15 reduced piling energy 1000 kJ max

+ 9,5 minutes average piling time



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⇒ Clear definition of operational limits!

⇒ Which limits are agreed?

⇒ Where and how to be measured?

⇒ Weather forecast

⇒ Who takes which risk?

⇒ Additional MWS requirements

But: No compromise on HSE!

3.2) Basics to ease life offshore

3) DanTysk – Foundations Installation Critical steps



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4) DanTysk – Foundations Installation Grouting

4.1 Basics

• ZiE process in Germany

• Detailed requirements for design/calculation, material, fabrication, surveillance, testing, installation etc.

� Improve engineering in all phases!



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4.2 Temperature

• Temperature requirement: ≥ 5 C

• Water and air temperature < 5 C until End of April 2013

� Improve engineering in all phases! Material, installation processes and additional measures!



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4.3 Grout hardening / Early age deformation

• Wave limits during hardening critical

• Initial wave limit: 1,6 m Hs => DTOW has taken action by own 3rd party calculations => 3 m Hs limit for the grout itself

• Remainig limiting factor: levelling tools

� Improve by smart engineering: Stability calculations and devices to stabilize TP temporary.



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5) DanTysk – Foundations Installation Noise mitigation



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BBC DBBC DBBC

+ linear BC

TBBC

+ linear BC

DBBC - DFI

+ linear BC

DBBC + BBC



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High effort during the MP installation phase led to increased noise mitigation



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• BBC, DBBC, TBBC, DBBC + BBC

• Double-end feed-in (+ extra vessel)

• Closing holes

• Nozzle tests

• Re-drilling holes

• Airflow-meters

• Compressor tests

• Reduced piling energy

• Manometer tests

• Hydrosound + C-POD measurements

• Reference measurements

• Extra hydrosound measurements

Total costs 20 mio EUR


Thanks for your attention!

Offshore Windpark DanTysk - kiwi-kiel.de · Kieler Branchenfokus Windindustrie | 2015.02.03...

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Transcript of Offshore Windpark DanTysk - kiwi-kiel.de · Kieler Branchenfokus Windindustrie | 2015.02.03...