Dutch contractor Van Oord has awarded Damen Marine Components (DMC) an order for three sets of steering and rudder systems for three dual-fuelled trailing suction hopper dredgers (TSHDs)
The dredgers are currently being built at Keppel Offshore & Marine’s Singapore shipyard. These 138 m long vessels, due for delivery in 2021, will have a hopper capacity of 10,500 m³.
Rudders and propellers will be supplied by Damen’s subsidiary Van der Velden.
Each vessel comes with two of Van der Velden’s commander piston-type steering systems and two master rudders will feature a fish-tail design bulb. The commander piston-type has an inhouse cylinder design and is available in a range of options with regard to rudder stock connections, rudder angles and cylinders.
DMC said this will make the installation process efficient and will reduce the amount of space required.
The rudders for Van Oord’s TSHDs will have an area of approximately 14 m² and will be class approved by Bureau Veritas for speeds of up to 15 knots. Each rudder will be executed with a rudder bulb to improve the propeller wake field.
The rudder angles, which go up to 65º, offer high lift and their fish-tail design can be optimised to the purpose of the vessel. DMC area sales manager Bogdan Mocanu said the rudder profile has been optimised during model tests for best manoeuvring performance at low speeds and in shallow waters.
The company said this design will help save energy, reduce fuel consumption, and increase thrust at higher loads. Energy saving has been a feature of Damen’s newest designs.