where the wind blows…€¦ · 2 towing tugs, 2 floating barges, 1 shear leg crane 1 revolving...

Where the Wind Blows…

Challenges and lessons leanred

May 9th 2019 HyunTae Cho, Swiss Re Asia Pte. Ltd.,

Weather Conditions in Asia/Korea

2

Typhoon Melor (2009)

50 year peak gust speed(1-minute average)280km/h = 78m/s

Loss at OnShore Wind Farm Erection Risks at Japan

• 20 units of 2.5 MW Wind Turbine under Testing

• Wind Turbines were locked @ Wind Speed of 25m/s

• Blade length – 44m

• 38 Blades out of 60 (3 x 20 units) were damaged

• Loss amount ~ USD48mil


3

IEC Wind Classes for WTG

50 year peak gust speed(1-minute average)280km/h = 78m/s

Typhoon Melor (2009)


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North Sea Europe Asia

50 Year Peak Gust Speed

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Vessels used for the foundation of offshore wind turbine

Vessels for 1 unit of Foundation

6


HGU Infrasea Solutions GmBH (2011)

North SeaVessels

for 1 unit of Foundation

7



North SeaAsia/Korea

S. Korea (2015-2017)


(Source:Swiss Re, photo by HyunTae Cho)

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North SeaAsia/Korea

S. Korea (2015-2017)


1 Anchor handling boat,2 Towing tugs,2 Floating barges,1 Shear leg crane1 Revolving crane barge1 SEP jack up barge


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Vessels used for the Offshore Wind Turbine

Installation of the first wind turbine for Gemini Project(Van Oord, 600MW=150@4MW, 2015)

(Source : Van Oord)

1 vessel => 6 WTGs

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Vessels used for the offshore wind turbine

Installation of the first wind turbine for Tamra OWF(30MW=10@3MW, 2016)


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Vessels used for OWF in Asia/Korea

• No Specialized Vessel for OWF

• More Vessels, More Difficult, More Time, …

• More Exposure!!!


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Conditions of Vessels used for OWF in Asia/Korea

• No specialized vessels for OWF

• Lowest bidding for vessels

• Poor quality shabby vessels

• High exposure of pollution from vessels


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Conditions of Vessels used for OWF in Asia/Korea

• No specialized vessels for OWF

• Lowest bidding for vessels

• Poor quality shabby vessels

• High exposure of pollution from vessels


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Cable Laying Barge?

= Flat Top Barge + Cable Laying Equipment ??


(Source:Van Oord, Nexus)

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Cable Laying Barge

= Flat Top Barge + Cable Laying Equipment ??

Flat Top Barge

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DCM Barge Collapse

Deep Cement Mixing Barge for soft sea bed

= Flat Top Barge + DCM equipment

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DCM Barge Collapse

Crane Vessel collapse

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Issues about many vessels and barges

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Issues about mooring line of flat top barges

(Source : Swiss Re, photo by HyunTae Cho)

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Issues about mooring line of flat top barges


Offshore Substation

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Fire on offshore substation caused by lighteningduring the construction !

Submarine power cable

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Submarine Power Cable Damage

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Jacket damage by vessel collision

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Issues on Construction Management

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Issues on Construction Management

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• Various and Multiple parties working together

• Less understanding on other parties work

• Various Delay Scenarios due to work practice, untimely delivery and completion of work

• Anyone who can manage ???

J F M A M J J A S O N D J F M A M J J A S O N D

Design

Lead Time and Manufacture

Installation

Design


Installation

Design and Routing


Installation

Design and Routing


Installation

Design


Installation

Design


Installation

WTG

Installation

Export Cables

Offshore

Substation

Onshore

Substation

2020

Q1 Q2 Q3 Q4

Inter Array

Cables

WTG

Foundation

Q1 Q2 Q3 Q4

2019

28

Document Review

Vessel Inspection

On-site Surveillancefor loading & unloading of major components including submarine power cable

On-site Surveillanceto the Installation Site

Marine Warranty Surveyor for OWF

Document Review

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• Design Load check• Method Statement check• Vessel, barge, crane adequacy check• Sea fastening plan check• and so on

Vessel Inspection

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On-site surveillance – loading & cable loadout

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On-site surveillance – Installation at site

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Conclusion

• Ending of our findings & lessons

36

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Conclusion

Increasing Risk Exposure !

More Vessels

More Contracts

More Documents

TC or EQLess

Experience


Design


Installation

Design


Installation

Design and Routing


Installation

Design and Routing


Installation

Design


Installation

Design


Installation

WTG

Installation

Export Cables

Offshore

Substation

Onshore

Substation

2020

Q1 Q2 Q3 Q4

Inter Array

Cables

WTG

Foundation

Q1 Q2 Q3 Q4

2019

38

Conclusion

Increasing Risk Exposure !

More Vessels

More Contracts

More Documents

TC or EQLess

Experience


Design


Installation

Design


Installation

Design and Routing


Installation

Design and Routing


Installation

Design


Installation

Design


Installation

WTG

Installation

Export Cables

Offshore

Substation

Onshore

Substation

2020

Q1 Q2 Q3 Q4

Inter Array

Cables

WTG

Foundation

Q1 Q2 Q3 Q4

2019How to minimize these risks ??

Legal notice

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