Review of Cabling Techniques and Environmental Effects Applicable

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Review of Cabling Techniques and Environmental Effects Applicable to the Offshore Wind Farm Industry – Technical Report Table 3.9: Rock Ripping Ploughs 44 PLOUGH ROCK RIPPING PLOUGHS Type Maximum Burial Depth Operator Manufacturer Rock Plough 1 1.0m rock 3.0m soft soils Rock Plough 2 1.0m rock 3.0m soft soils ISU Plough (for offshore umbilicals) Figure 3.17: Rock Ripping Plough (Photo Courtesy of CTC Marine Projects) Vibrating share ploughs CTC Marine Projects SMD Hydrovision Ltd CTC Marine Projects SMD Hydrovision Ltd 1.0 to 1.2m CTC Marine Projects SMD Hydrovision Ltd A vibrating share plough consists of a narrow share (suitable for the burial of cable systems) which is then vibrated to ensure cutting progress through difficult seabed conditions such as chalk and gravel beds. The vibration action is usually achieved by a hydraulic actuator. Table 3.10 lists examples of vibrating share ploughs.
Table 3.10: Vibrating Share Ploughs Cable types and installation techniques PLOUGH VIBRATING SHARE PLOUGHS Type Maximum Burial Depth Operator Manufacturer ESV 12 Up to 2.2m Travocean Unknown ESV 11/3 Shallow Water Only (Up to 3 cables simultaneously) ESV 07/3 Shallow Water Only (Up to 3 cables simultaneously) Up to 1.3m Travocean Unknown Up to 1.1m Travocean Unknown The Travocean ESV 12 vibrating plough was successfully deployed to bury the Tangerine telecom cable off the east Kent coast adjacent to Dumpton Gap. The subsea cable system was successfully buried to a consistent burial depth of 1.4m in a chalk seabed as confirmed by the cable owner. 3.8.3 TRACKED CABLE BURIAL MACHINES There are a large number of tracked cable burial vehicles deployed around the world. These types of vehicles are generally divided into two sub-groups: ● ● Tracked Vehicles for Shallow Water Use (usually within the range of air divers); and Tracked Vehicles for Deep Water Use (in water depths up to 2500m). Table 3.11 describes a range of tracked cable burial vehicles used worldwide. 45
Page 1: REVIEW OF CABLING TECHNIQUES AND EN
Page 4 and 5: Review of Cabling Techniques and En
Page 9 and 10: Abbreviations AIS Automatic Identif
Page 11: TTS Temporary Threshold Shift TWA T
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Page 82 and 83: 4 Physical change 4.1 Introduction
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Review of Cabling Techniques and En
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6 Good practice measures This secti
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7 Gaps in understanding Research fo
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References Introduction Sinden, G.
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Appendix A: Standards and codes of
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Printed in UK on recycled paper. De
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