Rotech Subsea Completes Walney Cable Job

Rotech Subsea has completed a cable burial scope for Ørsted at the Walney offshore wind farm in the Irish Sea.

Rotech said it was responsible for all operations for the project, from chartering the vessel to contracting all relevant parties.

The UK company provided its TRS1LD Jet Trenching tool, equipped with HP jets, to carry out the cable burial at the wind farm.

The subsea spread of equipment was mobilized on the OSV Relume and deployed using the vessel’s crane.

Two separate cables, totaling 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, Rotech said.

“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.

“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 367 MW Walney offshore wind farm comprises 102 Siemens turbines that were put into operation in 2012.

Photo: Rotech