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Rotech Subsea completes Walney Extension cable burial

By: Tom Russell 22/04/2020 Rotech Subsea

Equipment General Windfarms

Excavation and trenching specialist Rotech Subsea has completed a cable burial scope at the Walney Extension offshore wind farm for Ørsted.

The company was commissioned to charter the vessel and contract all relevant parties required, with the trenching project wrapping up in late 2019. It covered operations on the export cables for Walney 3 and 4, aand Walney Extension East and West.

Rotech Subsea - which designs, builds and operates its second generation “RS” range of non-contact excavation tools- deployed to provide its TRS1LD Jet Trenching tool equipped with HP jets to carry out the cable burial. The subsea spread of equipment was mobilised on the OSV Relume and deployed using the ship’s crane.

Two separate cables - totalling approximately 3.5km in length - were trenched to a specification of 2.0m TOC in the soft sand areas and to 1.0m TOC in the Stiff Clay areas. Water depth ranged from -2.0m to +14.0m LAT. The project was completed with the cables trenched at an average rate of 4m/min in soft sand areas and 2m/min in the stiff clay.

“This was a great project for Rotech Subsea as it saw us take on the role of contractor, chartering our own vessel and engaging all the relevant parties required to make the project a success,” said Rotech Subsea Director, Stephen Cochrane. He added: “The unrivalled capabilities of the new TRS1LD Jet Trenching tool made it perfect for this Irish Sea OWF scope. The TRS1LD Jet Trenching tool sets itself apart from mass-flow excavation tools because its patented design produces narrower, higher pressure jets which are up to seven times more powerful than some other excavation systems. This facilitated the scope being completed extremely efficiently and on budget.”

The Walney Extension offshore wind farm is owned by Danish offshore wind giant Ørsted and a consortium consisting of PKA and PFA, two leading Danish pension funds. It sits alongside the existing and operational Walney Phase 1 and Phase 2 offshore wind farms 14km west of Walney Island off the coast of Cumbria, in the Irish Sea, England. The project features 87 turbines; 40 MHI Vestas V164-8.0MW units and 47 Siemens Gamesa SWT-7.0-154. It has a capacity of 656 MW, enough to meet the electricity needs of more than 500,000 UK homes, and entered service in September 2018.

For more information on offshore wind farm grid connection systems, click here.

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Rotech Subsea completes Walney Extension cable burial

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