Maas & Mersey

THE CHRISTENING CEREMONY OF THE TWO CUSTOM DESIGNED AND CUSTOM BUILD WATER INJECTION DREDGERS (WID) MAAS AND MERSEY TOOK PLACE ON 30 JUNE AT THE OFFICE OF VAN OORD IN ROTTERDAM. THE SHIPS ARE TWO STATE-OF-THE-ART WID’S WHICH VAN OORD HAS ORDERED AT THE SHIPYARD.

Water injecton dredging is an efcient and environmentally friendly way of maintaining the depth of navigaton channels, ports, marinas, and rivers. Hybrid vessels Maas and Mersey were developed by Kooiman Engineering in close cooperaton with Van Oord. Two electrically driven pumps deliver water under high pressure or with a lot of volume through the U-shaped water injecton pipe located at the rear of the ship. With this pipe, water is injected into the soil, releasing sediment

which is fushed away by the current. Multple injecton methods are possible, giving the vessel optmal usability. The vessels measure (length and width including the water injecton pipe) 43.07 x 12.4m with a depth of 3.4m.

In a recent interview, Kooiman Marine Group and Van Oord shared their experience in working together on the two vessels. Project Manager at Van Oord Rick Jansen explains, “Van Oord has a feet of ten to twelve water injecton vessels, however we started to see new opportunites for water injecton dredging and our feet started to get outdated. It was tme for renovaton, so we shifed our focus to building two new future-proof vessels which can deploy the latest water injecton technologies and are a lot more sustainable.” With their extensive knowledge and skills, Kooiman Marine Group showed Van Oord that they were able to adhere to the wishes of the envisioned new WIDs. Project Manager at Kooiman Marine Group, Maarten Kooiman shares, “Van Oord wanted the depth of the ships to be as short as possible so they could enter shallow rivers in the smaller harbours. This, in combinaton with all the technology systems on board and the limited measurements, made it quite a challenge.” Afer spending many hours together to discuss the ship’s details, the result showed how much efort both partes put in. It was

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WID NL Koninklijke Van Oord NV 2021 Scheepswerf Gebr. Kooiman 43.07m 12.4m 3.4m 2,044kW 24m

an open and constructve collaboraton in which both Kooiman Marine Group and Van Oord had the same goal; a goal that was successfully achieved.

The latest technological developments have been applied to both vessels, such as actve heave compensaton and dynamic positoning, which means that the dredging can be pre-programmed to a great extent and performed more efciently. This new generaton of vessels is versatle and has water injecton dredging, mass fowing and power jetng systems. Mr Kooiman explains, “The frst sea trial with Maas was performed some tme ago. The sea trials were very intensive. The vessel is equipped with many systems that reduce emissions and increase employability. We tested these extensively. The vessel has a batery-hybrid energy management and with the fexibility of one or two diesel generators which meet the IMO TIER 3 and Stage V emission requirements, the on-board network is powered. In additon, heat from the exhaust gases is converted into electrical power which is fed back into the grid.”

Mr Jansen notes, “In additon to the development of a sustainable ship, we have also chosen to optmise the dredging process. The vessel is equipped with Dynamic Positoning and it is very manoeuvrable because of the two electrically driven rudder propellers and the electrically driven bow thruster. Thanks to the very low draught, these vessels are partcularly suitable for maintenance dredging in shallow ports.” Mr Kooiman goes on, “We looked at the shape of the underwater vessel in detail. Within the length, width, and draught restrictons, the design has been hydrodynamically optmised and the resistance has been minimised. This allows for less power to be installed, which directly results in a reducton in fuel consumpton and even less CO2 emissions. In additon, the noise level of the vessel is extremely low, resultng in maximum comfort for the crew.”