A 1,500-cubic-meter trailing suction hopper dredge (TSHD) under construction by Netherlands-based Kooiman Marine Group will have optimum maneuverability, even in narrow rivers, thanks to a relatively short length of about 75.9 meters and its twin Schottel RudderPropellers.
The TSHD, the Heggeman V, is being built for Germay’s Detlef Hegemann AG and is designed to carry out multiple types of dredging activities at specific locations.
The dredge was developed by Kooiman in close cooperation with the owner. With a suction pipe on the starboard side and an inboard dredge pump, the vessel is able to fill its 1,500-cubic-meter hold with silt or sand. When unloading through a row of bottom doors, the vessel must be maneuvered and positioned precisely.
In addition, the material can be pumped out by either one or two dredge pumps connected in series with discharge connections on both sides of the vessel, or via a bow connection.
Scheduled for delivery in July 2022, the 75.9- by 15.8-meter dredge is designed for worldwide operations and is operated by a crew of eight. To maintain ports and waterways, it will also be able to load up to 1,930 cubic meters of lower density materials.
The propulsion system consists of two Schottel RudderPropellers type SRP 270 (840 kW each), featuring fixed pitch propellers with a diameter of 1.85 meters. The azimuth thrusters will be driven by diesel-electric systems meeting the strictest emission requirements.
With medium-sized rudder propellers, Schottel is responding to trends in the international maritime market that include shifted engine power classes, new ice class rules and the growing trend towards electric or hybrid-drive vessels.
Combining the latest technologies in mechanical engineering, hydrodynamics, and digitalization, the medium-sized thrusters are available in three sizes which correspond to common engine power classes: SRP 210 (640 kW), SRP 240 (850 kW) and SRP 270 (1,000 kW).