Aberdeen-based excavation provider Rotech Subsea has completed a programme of cable IRM works at a key offshore wind farm in the Netherlands.
Headquartered in Aberdeen, Rotech is a group of companies which provides a range of trenching and excavation equipment, operated by Rotech Subsea, designed by Rotech Engineering and built in-house by Rotech Fabrication.
Rotech Subsea was commissioned by a European subsea service provider, mobilising its RS2 controlled flow excavation tool (CFE) mobilised from its base in in Q3, 2021.
The cable repair operations saw the RS2 de-bury approximately 800m of existing cable before carrying out the burial of new cable, with a September 2021 completion date.
The RS2 was deployed from the RS Sentinel vessel using the ship’s crane. Operating in water depths of 25m the cable was successfully de-buried from 1.64 – 2.2m below the seabed.
Following this, cable burial saw the RS2 mobilised on the CLV Elektron.
Rotech director of subsea, Stephen Cochrane said the on-time and on-budget delivery of the service confirmed RS as “the method of choice” for cable trenching in the European offshore wind sector.
“With yet more innovations due to be unveiled to the market in early 2022, our RS tools are providing deeper, narrower trenches than ever before, with progress rates more than double that of competing mass flow excavation tools,” he said.
The company has completed over 500 projects worldwide, using its suite of 14 non-contact CFE tools, developed by an in-house research, development and engineering team.
It said further “game changing” enhancements to CFE and related subsea services would be unveiled soon.
Drawing on a thirty-plus year track record in oil, gas and renewables, Rotech announced a return following the 2011 sale of its technology. The company emerged from the ensuing non-compete period in 2015 with a new and updated CFE range, and in 2016 launched its TRS2 systems for major sandwave clearance and pipeline trenching scopes.