“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 |
About Jan De Nul Group
Innovation, expertise and sustainability. These are the driving forces of Jan De Nul Group. Thanks to our committed employees and tailored solutions, the Group is the current market leader in dredging and marine works as well as a specialised provider of services for the offshore market of oil, gas and renewables. The Group is also a major player in civil engineering, environmental and brownfield development projects.
The professional and innovative solutions of Jan De Nul Group are trusted across the industry. Whether it concerns the construction of new locks in the Panama Canal, the installation of offshore wind turbines or the redevelopment of contaminated industrial sites, together with its clients Jan De Nul Group builds for future economic development. I www.jandenul.com I annualreport.jandenul.com
