Offshore Wind

Subsea Cable Installation

Best Practice

Name: Jacky Yao

Time: 9th May 2019

Table of Contents

• A Key Part in OWF Development

• Best Practice for Cable installation

• SBSS Business Scope

• SBSS Project Case Studies

Cable Installation

A Key Part in Offshore Wind Development

Submarine cable is the vital connection between the power

generated by turbines and onshore substation.

No Cable, No Power

Fishing operation

High tension during load/lay

Poor slack control

Complicated sea bead condition

Cable damage would happen!

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)

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

Best Practice

Offshore Wind Subsea Cable Installation

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

Overview of Export Cable Installation Process

1.Pre-lay Survey and Site

Inspection2.Draw up Plan of Work

Overview of Export Cable Installation Process

3.Vessel and Crew

Mobilization4.Cable Loading

Overview of Export Cable Installation Process

5.Transporting to the

Installation Site6.Route Clearance

Overview of Export Cable Installation Process

7.Shore-end Landing 8.Cable Lay and Burial

Overview of Export Cable Installation Process

9.J-tube Pull-in to Offshore

Platform10.Testing

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!

Best Practice- Professional Installer

How to Evaluate?

• Financial Status

• Track Record

• Assets and Personnel

• Solution

• Price Offering

• Warranty Terms

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)

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

Best Practice- Selection of Protection

Protection Methods

• Burial

• Pipe protection

• Sandbag

• Uraduct

• FCM protection

• Rock dumping

Offshore Wind Services

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

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

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.

SBSS Services Offering

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.

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

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.

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

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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