Review of Cabling Techniques and Environmental Effects Applicable
Review of Cabling Techniques and Environmental Effects Applicable
Review of Cabling Techniques and Environmental Effects Applicable
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<strong>Review</strong> <strong>of</strong> <strong>Cabling</strong> <strong>Techniques</strong> <strong>and</strong> <strong>Environmental</strong> <strong>Effects</strong> <strong>Applicable</strong> to the Offshore Wind<br />
Farm Industry – Technical Report<br />
Table 3.15: Guidance on the performance <strong>of</strong> burial devices<br />
(with burial device options) in various seabed sediments<br />
Cable Burial Devices Burial Device Options Sediment Type<br />
72<br />
S<strong>and</strong>s Silts Gravel Weak<br />
Clays<br />
Stiff<br />
Clays<br />
Cable Burial Ploughs Conventional narrow<br />
share cable ploughs <br />
Tracked Cable Burial<br />
Devices<br />
Free Swimming ROVs<br />
with Cable Burial<br />
Capability<br />
Rock<br />
Advanced cable ploughs <br />
Modular cable ploughs <br />
Rock ripping ploughs <br />
Vibrating share ploughs <br />
Jetting systems ? <br />
Rock wheel cutters P P P <br />
Chain excavators P P <br />
Dredging systems ? ? <br />
Jetting systems ? <br />
Dredging systems ? ? <br />
Burial Sleds Jetting systems ? <br />
KEY<br />
<br />
= Should be capable <strong>of</strong> burial.<br />
Rock wheel cutters P P P <br />
Chain excavators P P <br />
Dredging systems ? ? <br />
? = Performance will be related to the type <strong>of</strong> sediment <strong>and</strong> the power delivery to the burial device.<br />
P = Performance possible in the sediment type but not an ideal application.<br />
<br />
= Unlikely to be capable <strong>of</strong> burial.<br />
Cable burial for <strong>of</strong>fshore wind farms is usually undertaken using a barge which<br />
is specifically mobilised with cable h<strong>and</strong>ling <strong>and</strong> burial equipment. The same<br />
barge will also be equipped with a number <strong>of</strong> heavy duty tow winches which<br />
are capable <strong>of</strong> deploying a six or eight point anchor system to provide stability<br />
during cable burial operations. An anchor h<strong>and</strong>ling vessel is independently<br />
used to lift <strong>and</strong> place anchors in order to allow the cable installation barge to<br />
appropriately reposition itself as the burial works progress.<br />
In circumstances where the cable installation barge is the host vessel for cable<br />
burial operation using a towed subsea plough, the anchors are deployed in such a