Jan De Nul Group orders a 6,000 m3 and a 18,000 m3 trailing suction hopper dredger


Both hopper dredgers will be fully diesel-electric.
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.

In addition to these measures, an exhaust gas treatment system is installed.
The Selective Catalytic Reduction (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 18.000 m3 dredger in its shipyard in Dalian in China.
Delivery is foreseen in 2020.
The 6,000 m3 dredger is the second of this type ordered by Jan De Nul Group at Keppel Singmarine Pte. Ltd. in Singapore.
The order for the first one was given in May 2017.

Main characteristics of the 18,000 m3 dredger:

Total installed power:22.540 kW
Pump power (discharging): 14.000 kW
Hopper capacity: 18.000 m3
Length o.a.: 166,1 m
Breadth: 36,0 m
Draught: 9,8 m
Speed: 15,5 kn
Suction pipe: 1 x 1.200 mm
Dredging depth: 86,0 m

Main characteristics of the 6,000 m3 dredger:

Total installed power:7.700 kW
Pump power (discharging): 4.000 kW
Hopper capacity: 6.000 m3
Length o.a.: 111,7 m
Length b.p.: 71,8 m
Breadth: 24,6 m
Draught: 7,0 m
Speed: 12,5 kn
Suction pipe: 1 x 1.000 mm
Dredging depth: 35,0 m

Source: Jan De Nul Group, 5 February 2018