Review of Cabling Techniques and Environmental Effects Applicable
Review of Cabling Techniques and Environmental Effects Applicable
Review of Cabling Techniques and Environmental Effects Applicable
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Cable types <strong>and</strong> installation techniques<br />
Each alternative cable protection methodology will have its relative merits <strong>and</strong><br />
detractions <strong>and</strong> the selection <strong>of</strong> the most appropriate form <strong>of</strong> cable protection<br />
will be dictated by the requirements at a particular location.<br />
Concrete mattresses<br />
Concrete mattresses are widely used on power cable <strong>and</strong> pipeline installations<br />
both as a means <strong>of</strong> primary cable protection <strong>and</strong> also for crossings over other<br />
existing subsea cables <strong>and</strong> pipelines. Concrete mattresses are prefabricated<br />
<strong>and</strong> consist <strong>of</strong> a number <strong>of</strong> concrete block sections connected by polypropylene<br />
rope. They are usually approved by other stakeholders, particularly fishermen<br />
who consider concrete mattresses to be potentially less damaging to their<br />
fishing gear than rock dumping. Figure 3.22 shows a concrete mattress being<br />
lifted <strong>and</strong> Figure 3.23 shows how a concrete mattress is deployed over a cable<br />
or pipeline.<br />
Figure 3.22: Concrete Mattress being Lifted by a Lifting Frame<br />
(Photo courtesy <strong>of</strong> FoundOcean Ltd)<br />
57