Turkey’s Gemak Group has been awarded a contract by Jan De Nul Group to undertake the mid-life refit project of the cutter suction dredger, Leonardo Da Vinci, one of the biggest vessels of its type in the world. Built in 1985 at IHC Holland Shipyard, with 129.7m length overall, 22.4m beam, 33.4m of dredging depth. The total installed diesel power - 20,257kW, Submerged pump power - 2740 kW, inboard pump power - 2 x 4,485kW, cutter power -5,480kW and propulsion power - 2 x 2,740kW.
The work scope of the contract included completely stripping out the accommodation areas, re-insulation, re-panelling, the removal and refitting and repairing of almost all of the dredging equipment and other heavy lifting gear. Gemak was also contracted to undertake a major refit of the deck crane and the renewal of crane tracks, major steel renewal and modification works, electrical system upgrades and renewals, the painting of equipment, tanks and open spaces, and overhauling the big cutter gearbox, which weighs around 120 tons.
One of the biggest challenges during the drydock operation was the removal of the 1200 tons cutter ladder from the vessel, blasting interior and exterior areas and applying silicone paint. All cutter ladder turning points, cutter ladder shafts, bearings, and hinge bores were also repaired, overhauled and reconditioned during the drydock period, which was recently completed. The vessel was the berthed alongside for final equipment installation, refitting and testing, prior to redelivery.
Dredger repairs and upgrades make up an important business segment for Gemak. During 2015 the company repaired four dredgers for DEME, three for Jan De Nul and one each for Van Oord and Baggerbedrijf de Boer, as well as the Leonardo de Vinci project.