Jan De Nul Group launched their 6.000m³ trailing suction hopper dredger (TSHD) Sanderus in Singapore last week.
This green vessel – Jan De Nul’s fourth Ultra-Low Emission – is the first of two identical medium-sized hopper dredgers under construction at Keppel O&M’s shipyard in Singapore, fitted with a two-stage filtering technique for exhaust gases.
The design of the Sanderus combines a shallow draught with high maneuverability, making her very suitable for working in confined areas.
The TSHD, built at the Keppel Offshore & Marine shipyard, is diesel-electric driven; all major drives (thrusters, dredge pump, jet pumps, etc) are electrically driven, and controlled by means of frequency converters.
According to Jan De Nul, “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.”
In total, Jan De Nul Group designed six Ultra-Low Emission vessels (ULEvs) for its fleet: five trailing suction hopper dredgers and one offshore jack-up Installation vessel, the Voltaire.
The two 6.000m³ hoppers and the Voltaire are still under construction. Three 3,500 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.