Ecosse Subsea-plough clears 50,000 boulders for DONG Energy offshore wind farm foundations


An Ecosse Subsea  SCAR plough aboard the Havila Jupiter
An Ecosse Subsea SCAR plough aboard the Havila Jupiter

Banchory-based Ecosse Subsea Systems has successfully completely a major boulder-clearance and seabed preparation campaign on behalf of DONG Energy.

The subsea engineering specialist cleared almost 50,000 boulders and other obstructions from 33 routes spread over a distance of 30 miles at the Westermost Rough wind farm, five miles off the coast of Yorkshire.

Set up in 1996 in Aberdeen, Ecosse Subsea specialises in offshore engineering consultancy and subsea technology for the subsea energy and offshore renewables markets.

The company deployed its multi-functional SCAR seabed-plough and, working from the Havila Jupiter  support vessel, completed ploughing and surveying operations within 20 metre corridors located between 33 turbines and the offshore sub-station.

The 72 day campaign, which had been mobilised in a 47-hour time-frame from Aberdeen, was delivered on time and within budget, and demobilisation took less than 24 hours. The Ecosse Subsea team comlprise offshore management and operations workers, including survey and ROV specialists.

Mike Wilson, Managing Director, Ecosse Subsea, said: ““The workscope covered multi-pass boulder clearing on up to 33 routes, covering an area of 720,000 sq metres and involved complex seabed navigation with ROV back-up to ensure pinpoint accuracy between passes.

 “Our SCAR plough is now well-established as preferred tool by leading oil, gas and renewables companies and its credentials as a safe, economic and reliable seabed clearance solution has caught the attention of many of the major operators.”

The Westermost Rough sea-bed clearance project was ESS’s third seabed clearance contract in the renewable sector – following on from Baltic 2 and Humber Gateway projects. The company and currently seeking to fill another 10 jobs. Clients include Shell, CNR International, Bibby Offshore, Subsea 7, Technip Offshore, BP, Nautricity and Eon Renewables.

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