Jan De Nul Group and the shipyard Neptune Marine near Dordrecht in the Netherlands launched the new water injection dredger Cosette on 12 October. The new build is a sister vessel to the Pancho, delivered earlier this year. The design of both vessels is based on an existing design from Neptune’s workboat portfolio.

The godmother of the vessel is the four-year-old Cosette Goethals, daughter of Julie De Nul and granddaughter of ir. J.P.J. De Nul.

For this vessel, Jan De Nul, together with Neptune’s engineering department, has integrated its in-house designed and built dredging equipment, which includes the dredge pump, the dredge pipes, winches, hydraulics and the necessary equipment for an adapted pipeline routing on the fore ship.

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Ultra Low Emission vessel

Cosette is an Ultra Low Emission vessel or ULEv. Jan De Nul’s latest generation of vessels are equipped with a highly advanced dual exhaust gas filtration system that removes up to 99 per cent of the polluting nanoparticles from the exhaust gases, using a diesel particulate filter (DPF), plus a selective catalytic reduction system (SCR) for significantly reducing NOx emissions.

‘With Cosette, we conclude an investment program of two new water injection dredgers that are even more compact than our existing fleet of water injection dredgers,’ says Jan Van de Velde, Head of the Newbuilding Department at Jan De Nul Group. ‘Thanks to their compact character combined with an exceptional depth range, Cosette and Pancho are perfectly suited for maintenance dredging works in harbours and rivers. The cooperation with the Neptune Marine shipyard during the construction of Pancho and Cosette was enriching, and we are now looking forward to completion this Autumn.’

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Water injection dredger

A water injection dredger is smaller than a trailing suction hopper dredger and is ideal in ports and rivers where the work area is often smaller. In water injection dredging, water is injected under low pressure into the subsoil, enabling the soil material to be removed.

This dredging technique is especially suitable for maintenance dredging in areas with recently deposited sediments, or for moving fine sand over shorter distances.

Jan De Nul currently has five water injection dredging vessels in its fleet, of which Cosette will be the newest addition.

Picture: Four-year-old Cosette Goethals christened her namesake in the presence of her mum, dad and two sisters.

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Neptune Jan De Nul