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 3.13: Burial Sleds 56 BURIAL SLEDS Type Burial Systems Available Maximum Burial Capability Operator Manufacturer Bantam Jetting System 2.2m Global Marine Systems Ltd Injector Deep Water Jetting Tool – Specialised Application Between 2.0m and 10.0m Global Marine Systems Ltd Panzer Jetting System Between 2.0m and 5.0m Global Marine Systems Ltd Sabre Surface Powered Jetting Inductor Tool 2.0m Global Marine Systems Ltd ETA Ltd Unknown Unknown Unknown TJV 06 Jetting System 2.0m Travocean Unknown TJV 05 Jetting System Up to 4.0m Travocean Unknown TJV 04 Jetting System Up to 2.0m Travocean Unknown TM7 Jetting System Up to 3.0m Land and Marine Unknown 3.8.6 ALTERNATIVE CABLE PROTECTION METHODOLOGIES When cable protection cannot be achieved by cable burial, or for operational reasons cable burial is not the preferred method for cable protection, there are a number of other alternative cable protection methodologies available to ensure subsea cables are protected from hostile seabed intervention. The alternative cable protection methodologies which are reviewed in this section are employed on a worldwide basis and are suitable for all offshore wind farm development projects. Typical examples where alternative cable protection methodologies would be utilised are as follows: ● ● ● ● ● ● Sections of cable close to J-tubes where the cable burial machine commences burial at a transition point away from the J-tube (typically 10m to 20m in distance); Areas along the cable route where the subsea cables cross existing cables or pipelines; Areas of surface laid cable which has resulted from the need to recover a subsea cable plough due to weather or other operational reasons; Where burial has been difficult to achieve and sections of cable have been surface laid in the original cable burial operation; Where for operational reasons it has not been practical to mobilise a cable burial machine; and Environmentally sensitive coastal and sea cliff areas where directional drilling is employed.
Cable types and installation techniques Each alternative cable protection methodology will have its relative merits and detractions and the selection of the most appropriate form of cable protection will be dictated by the requirements at a particular location. Concrete mattresses Concrete mattresses are widely used on power cable and pipeline installations both as a means of primary cable protection and also for crossings over other existing subsea cables and pipelines. Concrete mattresses are prefabricated and consist of a number of concrete block sections connected by polypropylene rope. They are usually approved by other stakeholders, particularly fishermen who consider concrete mattresses to be potentially less damaging to their fishing gear than rock dumping. Figure 3.22 shows a concrete mattress being lifted and Figure 3.23 shows how a concrete mattress is deployed over a cable or pipeline. Figure 3.22: Concrete Mattress being Lifted by a Lifting Frame (Photo courtesy of FoundOcean Ltd) 57
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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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