Rotech Subsea completes major North Sea sand-wave clearance scope ahead of schedule

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04 December 2019

Rotech Subsea Ltd. has competed a major sand-wave clearance for Van Oord at the Norther Off-shore Wind Farm in the Belgian North Sea. Aberdeen-based subsea excavation pioneer, Rotech, de-ployed its state-of-the-art TRS2 Controlled Flow Excavation tool to carry out the scope of work.

The TRS2, part of Rotech’s fleet of 2nd generation non-contact excavation tools, was selected by Van Oord due to its unique performance characteristics. The result was that instead of the two cam-paigns originally programmed to clear the route, the entire scope was completed in a single cam-paign, bringing the client’s schedule of works forward.

"The capabilities of the TRS2’s Controlled Flow Technology and its ability to pre-sweep a wide cor-ridor extremely quickly and effectively resulted in increased productivity and a reduction on the project’s total costs,” said Rotech Subsea Director, Stephen Cochrane. "Sand-waves up to 2.5m in height were excavated successfully in water depths of up to 35m. The project was a huge success, allowing for the Norther IAC to be accessed for burial. Soil conditions were described as Very Dense Silty Sand to Clay, and the TRS2 achieved an excellent average excavation rate of 3m/min.”