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Offshore Wind
Subsea Cable Installation
Best Practice
Name: Jacky Yao
Time: 9th May 2019
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Table of Contents
• A Key Part in OWF Development
• Best Practice for Cable installation
• SBSS Business Scope
• SBSS Project Case Studies
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Cable Installation
A Key Part in Offshore Wind Development
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Submarine cable is the vital connection between the power
generated by turbines and onshore substation.
No Cable, No Power
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Fishing operation
High tension during load/lay
Poor slack control
Complicated sea bead condition
Cable damage would happen!
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Financial Loss of Cable Fault
Subsea Cable Cost Others Subsea Cable Insurance Claim Others
Overall Construction Costs Insurance Claims Cost
5-7% 70-80%
90 subsea cable faults occurred in the past 7 years in Europe
=
over USD 400 million in incurred claims
(quoted from Gcube)
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Average
repair time
= 100 days
The cost of a wind turbine not
operating is around $15,000 in
lost revenue per day
This equates to approximately
$45 million for 30
turbines over 100 days
Financial Loss of Cable Fault
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Best Practice
Offshore Wind Subsea Cable Installation
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Overview of Export Cable Installation Process
1.Pre-lay Survey and Site
Inspection
2.Draw up Plan of Work
3.Vessel and Crew
Mobilization
4.Cable Loading
5.Transporting to the
Installation Site
6.Route Clearance
7.Shore-end Landing
8.Cable Lay and Burial
9.J-tube Pull-in to Offshore
Platform
10.Testing
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Overview of Export Cable Installation Process
1.Pre-lay Survey and Site
Inspection2.Draw up Plan of Work
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Overview of Export Cable Installation Process
3.Vessel and Crew
Mobilization4.Cable Loading
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Overview of Export Cable Installation Process
5.Transporting to the
Installation Site6.Route Clearance
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Overview of Export Cable Installation Process
7.Shore-end Landing 8.Cable Lay and Burial
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Overview of Export Cable Installation Process
9.J-tube Pull-in to Offshore
Platform10.Testing
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Best Practice- Detailed Planning
Site Study
Site Visit and Route Survey
Multi-sided Coordination
• Evaluation of existing cables, fishing
activity and permitting
• Ensure security and economic
feasibility
-Determine the protection and
installation requirements
-Determine the landing
Detailed planning is crucial!
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Best Practice- Professional Installer
How to Evaluate?
• Financial Status
• Track Record
• Assets and Personnel
• Solution
• Price Offering
• Warranty Terms
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Best Practice- Selection of Asset
Key Factors to Concern
• Vessel or Barge?
• DP or Anchor Handling?
• Simultaneous or Post Lay Burial?
• Experienced Crew
• Cable Lay Software: Navigator, Blue Spider, Makai.
• Ancillary Equipment (Turntable, Tensioner, Gantry, etc)
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Best Practice- Selection of Burial Methods
Burial Methods
Advantages:
Quicker, more effective and economical
Limitations:
Risky to damage the cable and
complicated catenary operation
Simultaneous Lay Bury (SLB)
Post Lay Bury (PLB)
Advantages:
Derisk, more jetting passes
Limitations:
Slower and less effective
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Best Practice- Selection of Protection
Protection Methods
• Burial
• Pipe protection
• Sandbag
• Uraduct
• FCM protection
• Rock dumping
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Offshore Wind Services
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SBSS Overview
S.B. Submarine Systems Co., Ltd.
(SBSS) is Asia’s leading provider
of submarine cable installation
and maintenance services.
Established in Shanghai in 1995,
SBSS is a joint venture between
China Telecom and Global Marine
Group.
SBSS is a technology-driven
marine engineering company who
owns and operates a capable
fleet of versatile and fully
integrated cable ships.
Who we are
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SBSS Highlights
Our key statistics
• 50,000km subsea cable
installed since 1995
• SBSS has buried 10,422km of
cable to a depth of 3m
• In excess of 20 power cable
installation projects completed
in Asia
• Played a key role in more than
90 of Asia’s major telecom, oil
and gas and power utility
infrastructure projects
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Business Sectors
Telecoms
Asia’s leading submarine
telecoms cable installer and
maintenance provider with
over 50,000km installed since
1995 and over 20 years
maintenance contract in
Yokohama Zone.
Oil and Gas
Specialized in inter-platform
submarine cable and umbilicals
installation with notable project
experience of BP Tangguh, KJO
and Hangyan Field.
Power Utilities
Track record of successful
completion of 20 power cable
projects globally including
the simultaneous lay in South
Korea and turnkey project in
Bangladesh.
Renewables
In partnership with CWind (UK),
we provide a range of integrated
services across the lifecycle of
an offshore wind farm including
cable installation, CTV design
and chartering and GWO
training.
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SBSS Services Offering
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Our Expertise
Pre-Project Planning & Cable Installation
50,000km unprecedented track record
1. Cable loading and transportation
2. Export and inter-array cable installation
3. Shore-end landing (HDD included) and J-tube pull-in
4. Subsea cable repair and maintenance
Trenching & Protection
Cutting-edge assets deliver precision
1. Export and Inter-array cable burial
2. Customized protection solution including sandbag,
mattressing and uraduct.
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Our Expertise
Subsea Survey Solution
In-house expertise
1. Assess the burial status of the cable
2. Identify cable damage
3. Assess the burial depth of the cable
Crew Transfer Vessel Chartering
Strategic Partnership with CWind
Advanced European-designed CTV chartering, sale and
purchase and newbuilt
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Hwawon-Anjwa Cable Case Study
Location: Hwawon-Anjwa
Activity: 2X7km 154kV power cable installation
Time: 2011
SCOPE OF WORK
• Transportation & Installation of 2*7km 154kV
power cabel
• Shore-end landing
• Uraduct protection
Adding Value: The exceptional DP operating
skills enabled the successful cable
installation in a harsh weather environment.
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Datang Binhai OWF Case Study
Customer: China Datang
Vessel: JJ3001 Barge | Burial Tool: Jetting Sledge
Location: Binhai, Jiangsu, China
Activity: 23km 220kV export cable installation and burial
Time: March –May 2017
SCOPE OF WORK
• Transportation & Installation of 1*23 km 220kV
export cable
• Shore-end landing and Horizontal Directional
Drilling (HDD) installation
• J-tube pull-in
• Export cable burial to 3m water depth
• Final testing
Adding Value: Bringing our extensive deep
water experience into shallow water wind
farms , we achieved precise installation and
ahead-of-time project delivery.
Binhai, China
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Longyuan Dafeng OWF Case Study
Customer: Longyuan Jiangsu
Vessel: Ailan 1 Barge | Burial Tool: Jetting Sledge
Location: Dafeng, Jiangsu, China
Activity: 19.5km 220kV export cable installation and burial
Time: Oct 2018 –Jan 2019
SCOPE OF WORK
• Transportation & Installation of 1*19.5 km 220kV
export cable
• Shore-end landing and J-tube pull-in
• Export cable burial to 3m water depth
• Bend restrictor installation and diver’s intervention
• Final testing Adding Value: Our exceptional project
management ensures seamless communication
among various parities including developer,
local authorities and suppliers.
Dafeng, China
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Any Questions?질문?
Thank you!감사합니다!
LINKING THE WORLD
LIGHTING THE FUTURE