Rotech Subsea has completed three remedial cable burial scopes of work in relation to offshore wind farms off Germany for an undisclosed European cabling company.
Rotech Subsea mobilised its RS1-2 Hybrid CFE tool for the operations, deploying it at various locations across multiple export cables.
The tool operated in water depths between 3-13 metres in silty sands with intermittent hard layers.
The RS1-2 tool buried one export cable at the first offshore shore wind farm to client specification of 1.5 metres with remaining export cables at two further offshore wind farms lowered to three metre depths, or best endeavours, with possible hard and cemented areas anticipated to be encountered along the route.
Deployed from a vessel crane, forward and aft deck winches were used as orientation tuggers on the CFE tool, routed through snatch blocks fixed to pad eyes on the extended outriggers.
The RS1-2 remained suspended above the seabed / cable along the route to complete all trenching operations with the vessel’s DP positioning system used to move the CFE tool along the cable RPL routes/areas requiring trenching works.