Dutch dredging giant Van Oord has placed an order for complete MAN Diesel & Turbo propulsion packages for two 17,000 m³ trailing suction hopper dredgers (TSHDs).
Being built by Spanish yard Construcciones Navales del Norte in Bilbao, the comprehensive MAN packages consist of: 6L48/60CR engines; RENK gearboxes with PTO; Alpha CP propeller systems; Alpha high thrust propeller nozzles; and Alpha AT3000 propulsion control systems.
The new TSHDs will each be 158 m long, 36 m wide and equipped with twin suction pipes with submerged electrically-driven dredge pumps. They will each also have two shore discharge dredge pumps, six bottom doors, total installed power of 23,680 kW, and accommodation for 38 persons.
“Special attention was paid to the energy-efficiency of the vessels,” MAN stated. “The design includes several aspects that result in substantial reductions in fuel consumption and consequently a fall in CO2 emissions. Both vessels will be equipped with innovative and sustainable systems and will both obtain a Green Passport and Clean Ship Notation.”
A MAN spokeswoman added that the dredgers would comply with the strict 2015 EU directive on emissions control areas in the Baltic and North seas, and were “accordingly designed for future operations in this area”.
She added, “Delivery dates for both dredgers are scheduled for 2017, but there will be some months between each delivery.”
Heart of the propulsion package is the 48/60CR engine, which MAN describes as, “One of the most successful engine types used in dredging. Currently, MAN has 14 such engines on order for installation aboard cutter- and hopper-dredger newbuildings for customers in Benelux and China. All engines will be built at MAN’s main facility in Augsburg, Germany.”
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The 48/60CR features in-house-developed technologies to optimise performance, including: TCA-type exhaust-gas turbochargers; electronic fuel injection systems; and hardware and software for engine control, monitoring, and diagnosis.
The Alpha CP ducted propellers are headbox-mounted AHT nozzles, driven via shaft lines – each shaft featuring a disc brake and locking system.
“A high degree of service friendliness is ensured since the propeller-hub mechanism can be inspected and dismantled from aft,” the MAN spokeswoman noted. “Additionally, by means of intermediate plates between propeller blades and blade flanges, the blades are predisposed to underwater replacement – avoiding the need for docking – should such a scenario arise.
“The twin-screw Alphatronic 3000 system will control the two propulsion lines via bridge and engine room control stations, and via an interface to joystick control for dynamic-positioning requirements,” she added.
Van Oord COO Paul Verheul stated, “The new vessels are a contribution to the further modernisation of Van Oord’s fleet and mark the start of a new generation of TSHDs.
“They will strengthen the mid-class section of our hopper fleet and are characterised by a large deadweight in combination with a shallow draught, which makes them very competitive in various markets, including that for coastal protection projects.”