Jan De Nul Group orders 6,000 m³ and 18,000 m³ Trailing Suction Hopper Dredgers
“These compact and medium-sized vessels are provided with features making it the best in their class for efficiency and emissions”, says Robby de Backer, Director Newbuilding Department.
Lower fuel oil consumption and lower emissions
Both hopper dredgers are in fully diesel-electric execution. This is exceptional for a hopper dredger as large as the 18,000 m3 vessel. All main drives, including the main propellers are electrically driven via frequency converters. In this way each system runs at its optimal operation point, resulting in lower fuel oil consumption, and lower emissions. Power is generated by three diesel-driven generator sets. A-symmetric load sharing, ‘fuel-mapping’, and automatically starting/stopping the engines in function of the power demand is implemented. This again allows reduction of fuel consumption and emissions.
Exhaust gas treatment system
In addition to these measures, an exhaust gas treatment system is installed. The SCR system reduces NOx emissions to the future EU Stage V level, which is more stringent than the requirements of IMO tier II and IMO tier III. ‘Fuel-mapping’ allows us to select the operational regime of the engines; specific fuel consumption can be optimized in function of the loading of the engine, and in synchronization with the exhaust gas treatment system.
The 18,000 m³ vessel is equipped with a single suction pipe, with a submerged dredge pump. The hopper is subdivided in two parts, enabling sailing on even keel, at all loading conditions. Two double-walled shore-discharging pumps with a total power of 14,000 kW are installed.
Cosco (Dalian) Shipyard Co.Ltd. will build the vessel in its shipyard in Dalian in China. Delivery is foreseen in 2020. Keppel Singmarine Pte. Ltd. will build two 6,000 Trailing Suction Hopper Dredgers in Singapore.
Main characteristics of the 18,000 m³ dredger
Hopper capacity
18,000 m³
Deadweight
30,000 ton
Length o.a.
166.1 m
Breadth
36.0 m
Draught loaded
9.75 m
Maximum dredging depth
86.0 m
Diameter suction pipe
1,200 mm
Pump power (trailing)
3,400 kW
Pump power (discharging)
14,000 kW
Propulsion power
2 x 7,500 kW
Total installed diesel power
22,540 kW
Speed
15.5 kn
Accommodation
32 p
Main characteristics of the 6,000 m³ dredger
Hopper capacity
6,000 m³
Deadweight
9,880 ton
Length o.a.
111.7 m
Breadth
24.6 m
Draught loaded
7.0 m
Maximum dredging depth
35.0 m
Diameter suction pipe
1,000 mm
Pump power (trailing)
1,500 kW
Pump power (discharging)
4,000 kW
Propulsion power
2 x 2,150 kW
Total installed diesel power
7,700 kW
Speed
12.5 kn
Accommodation
16 p
These compact and medium-sized vessels are provided with features making it the best in their class for efficiency and emissions.
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