Rotech Subsea has completed cable burial works for the 367MW Walney offshore wind project in the Irish Sea for developer Orsted.
The excavation and trenching contractor took on responsibility for all operations for the project, from chartering the vessel to contracting all relevant parties.
Rotech Subsea used its TRS1LD jet trenching tool to carry out the cable burial at the Walney site.
The TRS1LD kit was chosen due to its “unparalleled” technical performance and capabilities, which resulted in “increased productivity and a reduction of total project costs” said Rotech Subsea.
The subsea spread of equipment was mobilised on the offshore service vessel Relume and deployed using the ship’s crane.
Two separate cables, totalling approximately 3.5km in length, were trenched at an average rate of four metres per minute in soft sand areas and two metres per minute in areas of the seabed with stiff clay.
Rotech Subsea director Stephen Cochrane 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.
“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.”