Cable Present Ranking in J-Tubes for Offshore Windfarms


To guard cables alongside their vertical trajectory from the seabed to the above-water construction the cables may be guided by way of a J-tube, an I-tube, or by way of the within of a basis through a gap.

A j-tube is a pipe that has a vertical bend and usually a bellmouth (which facilitates the pull-in of the cable) for cable entry taking the route from vertical to horizontal close to the seabed. The definition of a J-tube in accordance with DNV-RP-0360 [2] is that it’s “an open-ended, J-shaped part of a tube or pipe, connected internally or externally to a set offshore unit, for guiding and safety of a cable or cable meeting. The J-tube extends from a platform deck to and is inclusive of the underside finish close to the seabed. J-tube helps are used to attach the J-tube to the supporting construction.”

An I-tube, then again, ends vertically, and due to this fact your complete bend onto the seabed from vertically is made in free water close to the entry of the I-tube which makes the cables extra prone to scouring, abrasions, and better dynamic loading. I-tubes require considerably bigger distances between the tip of the tube and the undisturbed seabed to facilitate cable set up.

Cling-offs are positioned on the high of the J-tube or I-tube, close to the cable termination positions, that securely anchor the cables by the armour and electrically join the cable armour to the earthing/grounding system of the construction.



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