News - Week 26, 2004
TSH Dredger “Scelveringhe” handed over The sand/gravel trailing suction hopper dredger 'Scelveringhe' was recently handed over to Scelveringhe Scheepvaart BV by Shipyard K. Damen BV. The ship was ordered by the Den Herder family from Yerseke, the Netherlands. The 'Scelveringhe' is an advanced medium-size trailing-suction hopper dredger, designed for the winning of sand and gravel at sea. The vessel can dredge down to a maximum depth of 33.5 m. The hull and installations, as well as the loading and unloading installation, was designed and engineered by Shipyard K. Damen b.v. Particular attention has been given to the vessel's self-unloading facilities. To make the vessel maintenance-friendly, special emphasis was put on flush constructions on the weather deck. In addition, corrosion sensitive components and parts, such as window frames, ventilating gratings, hinges, stair steps, ladders, cable pipes etc. are of stainless steel construction. The underwater area of the hull is protected by an impressed current protection system (ICCP).
The steelwork for the hull and unloading system was carried out by Aker Braila under the supervision of Shipyard K. Damen b.v. A 4,320 kW MAK type M32C diesel engine drives a CP-propeller through a reduction gearbox providing the vessel with a service speed of 13 knots. For the loading the hopper, the vessel is equipped with a diesel driven dredge pump with a pumping capacity of 15,000 cum/h which is connected to the trailing suction pipe. A self-unloading system is installed, enabling the ship to discharge its dry cargo autonomously. The dredged sand or gravel can be treated when the vessel is homeward bound. Desalination of sand/gravel is achieved with the aid of large freshwater rinsing tanks, and the drying of the cargo is done with a drainage system, consisting of drainage tubes inside the hopper connected to de-watering pumps. Sand or gravel can be discharged with an unloading vehicle which is equipped with an 18 m3 grab, electric-hydraulic driven by one of the 1800 kW generators. This vehicle travels over the hopper and discharges its sand and gravel via its transverse conveyor to the longitudinal conveyor belt, the two connecting belts and the shore conveyor of 47 meter, which can be rotated over an angle of 360 degrees. The load can be discharged to shore at a transfer rate of approximately 2,000 cu.m/h.
Loading will take approximately one hour and unloading approx. 2 hours. This high capacity loading and unloading installation, in combination with the vessel's speed, enables the vessel to have a round-trip voyage within a relatively short time span. This makes this sand/gravel trailing suction hopper dredger 'Scelveringhe' more than competitive in the market it will work in.
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