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BMT'S LNG FERRY DESIGN PROVEN IN SEA TRIALS

Friday, July 3, 2020 

BMT has announced the successful completion of sea trials for its latest design, the first of two 70m 100% LNG-fuelled ro-pax ferries designed for the operator Rederij Doeksen of the Netherlands, and built by Strategic Marine Shipyard (Vietnam) while final outfit and commissioning were completed by the operator.

With an operating area within an UNESCO World Heritage Site, the main focus for Rederij Doeksen and BMT was on reducing the environmental impact of the vessel operation. BMT provided the technical solution to reduce NOx, CO2, and noise while increasing the efficiency of the design to achieve lower operational costs. Various newbuild options were considered. The medium speed aluminium catamaran platform was selected to achieve significant fuel consumption reduction compared to an equivalent monohull. Having considered these requirements together with the specificity of the route BMT developed the ship full detail design.

Sylvain Julien, Director of Naval Architecture, Specialised Ship Design, BMT, said: “The development of a full aluminium vessel to meet national rules that typically assumes steel construction has, as always, been a challenge. Despite this, the end result demonstrates the benefits in terms of low power consumption, and specifically for Rederij Doeksen’s operation, the low operating draught”.

The development of the hull form followed a multi design criteria optimisation approach to account for the many constraints on the projects such while offering the lowest possible power requirement across the ferry's operational range. The outcome of this work was successfully confirmed through model testing. The low power requirement confirmed through this work also bolstered Rederij Doeksen’s decision to use LNG as sole fuel onboard the vessel. The propulsion system selected is based on the new MTU pure gas engines providing both fuel efficiency and sustainability with no marine gas oils being required for operation (unlike the more common dual fuel engines). The IMO Tier III and EU stage V compliant engines each deliver 1,500 kW and drive a Veth VZ contra-rotative unit to achieve a service speed of 14 knots.

Aside from the LNG used for the main propulsion and boilers, BMT and Rederij Doeksen paid particular attention to minimising energy consumption through a waste heat recovery and battery system to power the vessel bow thrusters and provide peak shaving capabilities.

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