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 3.12: Free Swimming Cable Burial Machines 54 Type Burial Systems Available FREE SWIMMING CABLE BURIAL MACHINES Maximum Burial Capability Atlas 1 Jetting System Up to 1.0m in sands and low to medium strength clays Atlas 2 Jetting System Up to 1.0m in sands and low to medium strength clays Excalibur Jetting System Up to 3.0m in sands and low to medium strength clays Scorpion C/N Burial Sled Various Work Class ROVs with Burial Sleds Various Work Class ROVs with Burial Sleds Jetting System Up to 1.0m in sands and low to medium strength clays Jetting System Up to 1.0m in sands and low to medium strength clays Jetting System Up to 1.0m in sands and low to medium strength clays CT 1 Jetting System Up to 3.0m in sands and low to medium strength clays CMROV 1 Jetting System Up to 1.0m in soft soils only CMROV 2 Jetting System Up to 1.0m in soft soils only CMROV 3 Jetting system Up to 1.5m in sands and low to medium strength clays CMROV 4 Jetting system Up to 1.5m in sands and low to medium strength clays SCARAB III Jetting System Up to 1.0m in soft soils only Scarab IV Jetting System Up to 1.0m in sands and clays Triton ST200 Jetting System Up to 1.0m in sands and low strength clays Maximum depth of Operation Operator Manufacturer 2000m Global Marine Perry Slingsby Systems 2000m Global Marine Perry Slingsby Systems 2000m Global Marine Perry Slingsby Systems 3000m Acergy – formerly Stolt Offshore Saipem / Sonsub Canyon Offshore 2500m CTC Marine Projects Ltd 2500m CTC Marine Projects Ltd 2500m CTC Marine Projects Ltd 1500m CTC Marine Projects Ltd 1500m CTC Marine Projects Ltd 1000m – burial 2000m – inspection 1000m – burial 2000m – inspection 2500m Tyco Submarine Ltd Perry Slingsby Systems Sonsub - - SMD Hydrovision Ltd SMD Hydrovision Ltd SMD Hydrovision Ltd SMD Hydrovision Ltd ACMA Group Oceaneering Ltd ACMA Group Perry Slingsby Systems Perry Slingsby Systems
3.8.5 BURIAL SLEDS Cable types and installation techniques Most burial sleds are developed for the burial of the shore end section of cable systems and work in shallow water. As well as being used for open water shore end cable installation, these machines are often used for river crossing and estuary cable work. Most of the systems are relatively simple in their technology and consist of a basic frame structure to provide a pathway for the cable and a simple hydraulic function to allow for a jetting tool to be deployed to the required depth of cable burial. In most instances the water pumps for the jetting tools are provided from the host vessel with pipework direct to the burial sled. These low cost shallow water burial tools inevitably require diver intervention for cable loading and unloading. Burial sleds are also used in shallow water areas where the seabed or intertidal zone consists of very soft muds or where seabeds will not provide any bearing support to a tracked cable burial vehicle or a conventional subsea plough. The burial sled is likely to be a lot lighter than these types of burial machines, particularly if the burial systems utilise surface powered jetting systems which negates heavy subsea pumps and motors. It can be possible to make these burial sleds almost neutrally buoyant by the attachment of temporary buoyancy and diver lift bags. Hence, the lightweight configuration allows the burial sleds to work in soft seabeds which would be out of the range of other burial machines. A selection of typical burial sleds which are currently used worldwide are listed in Table 3.13. The same table also includes details of injector systems. Injectors are large specialised jetting tools which are typically used in harbours and anchoring areas where deep burial is required (up to 10m). These units are powered from the surface and use massive pumps and power packs to deliver a very potent force into the seabed to achieve the depth of burial required. 55
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REVIEW OF CABLING TECHNIQUES AND EN
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Review of Cabling Techniques and En
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Page 9 and 10: Abbreviations AIS Automatic Identif
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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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