Dredger conversion made more efficient with PTO installation

Dredger conversion made more efficient with PTO installation

Malcolm Latarche

Malcolm Latarche · 04 September 2019


Netherlands-based electrical engineering specialist Bakker Sliedrecht has improved the efficiency of Faasse Groep’s new trailing suction hopper dredger Schenge by installing a shaft generator on the main engine. The new set up generates the electricity for the entire dredging installation. As a result, the ship works more efficiently, needs less maintenance and has an optimised lay-out.

Early this year, Faasse bought the 1996-built general cargo ship Mandeo in order to convert it into the trailing suction hopper dredger Schenge. After its completion in 2020, the vessel will be deployed for sand extraction in the North Sea. The Schenge has a hopper capacity of approximately 2,600m3, divided over two holds, so that it can carry two types of product.

For the electric drive of the dredging installation and jet pumps, a shaft generator with matching frequency drive from Bakker Sliedrecht has been added. This is connected to the existing main engine by means of a new PTO shaft. The vessel has an adjustable propeller (CPP) and because the main engine runs at a low load for propulsion during dredging, this power can be used for the electrical dredging installation.

As a result, the trailing suction hopper dredger does not require any auxiliary diesel generators saving fuel, space, piping, and maintenance. “We use the power that the main engine does not need during dredging. That makes the ship much more efficient and also ensures energy-efficient operations,” said Senior Electrical System Designer Marcel Bakker and Sales Engineer Wim Verlek of Bakker Sliedrecht. “Moreover, this solution saves a lot of space and allows a flexible and optimised lay-out of the vessel.”

During the conversion of the ship, Bakker also supervised the installation on board and the commissioning. The crew was also trained in dealing with the frequency drive so that they are familiar with the operation of the systems and the supplied manuals.

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