Rotech Subsea has completed cable de-burial, cut and recovery works at the Triton Knoll offshore wind farm, in the North Sea, for an undisclosed dredging and marine contractor.
Aberdeen-based Rotech Subsea deployed its RS2-3 Hybrid CFE tool to complete the de-burial of approximately 500 metres of cable, with its proprietary RSG-C tool completing the cable cutting at both ends and recovery to ship’s deck.
Operating in water depths of 12-15 metres, Rotech’s RS2-3 was launched into the North Sea by vessel crane where it was suspended, traveling along the half a kilometre of cable to complete de-burial operations.
The two-metre excavation depth was monitored in real time using a tool-mounted sonar imager, with the de-burial completed in two passes.
Rotech Subsea Director of Subsea, Stephen Cochrane, said: “With hard soils expected, this promised to be a challenging project.”
Launched from the vessel stern, Rotech’s bespoke RSG-C spread of equipment grabbed, cut and recovered the de-buried cable to deck successfully and safely.
The 857MW Triton Knoll offshore wind farm is owned by RWE.