Decommissioning in the North Sea
Ardent successfully decommissioned two Dogger Bank Meteorological Masts with the Seafox 5, a four-legged, self-elevating, self-propelled heavy lift vessel for Forewind Ltd.
The heaviest lift, of the suction bucket and monopole was calculated at 768 metric tons with clay-sticking.
The meteorological masts are composed of a 41 metric ton lattice tower, on a 58 metric ton platform, mounted on a single 53 meter tall pile, secured by a 15 meter diameter and 7 meter tall suction bucket.
The two Mast structures were installed four years ago to gather climate data to assess the feasibility of one of the UK’s largest potential offshore wind farm developments.
Ardent conducted a pre-removal survey to reduce any uncertainties, and to confirm the foreseen removal procedure of the weather data measuring equipment, lattice towers, platforms and suction bucket monopiles,
Ardent subsequently carried out the Project engineering, fabrication and decommissioned the structure. Ardent operated offshore operations with Seafox-5.
The Offshore operations were concluded slightly ahead of planned schedule in October 2017.
Ollie Flattery, SSE Project Manager said, “The successful and save removal of the structures is a great accolade for all parties involved in the project and a clear sign of the one team ethos, professionalism and diligence of the entire project team."
Forewind is a joint venture of SSE, Statoil and previously Innogy and Statkraft.