Jan De Nul Group has launched the 6000 m³ Trailing Suction Hopper Dredger (TSHD) Sanderus. It is the company's fourth Ultra-Low Emission vessel.
The vessel is being built at the Keppel Offshore & Marine shipyard in Singapore. It is the first of two identical medium-sized hopper dredgers under construction at this shipyard.
Two-stage Filtering Technique
Jan De Nul's Ultra-Low Emission Vessels are fitted with a two-stage filtering technique for exhaust gases. In total, the company designed six such vessels for its fleet: five TSHDs and one Offshore Jack-Up Installation Vessel, the Voltaire.
The two 6000 m³ hoppers and the Voltaire are still under construction. Three 3500 m³ ULEvs, of which the first was launched in July 2018, recently left Keppel O&M’s shipyard in China on their maiden voyage to their first assignment.
Diesel-electric Design
The design of the Sanderus combines a shallow draught with high manoeuvrability, making it very suitable for working in confined areas. The TSHD is diesel-electric driven: all major drives (thrusters, dredge pump, jet pumps, and such) are electrically driven, and controlled by means of frequency converters. In this way, each system can operate at its optimal speed and power.
Power is generated by means of three diesel generator sets. A control system automatically starts and stops the sets depending on the power requirement. Asymmetric load sharing results in optimal load distribution over the diesel generator sets. All these measures result in a low fuel oil consumption, which is the best in its class.
