TT Line ro-pax to feature MAN’s first dual-fuel propulsion package

Malcolm Latarche

Malcolm Latarche · 21 May 2019

ShipInsight


A TT line ro-pax being built at the Jinling Shipyard in China will feature a complete MAN propulsion package, besides the engines, including propellers, a fuel-gas-supply system (FGSS), and HyProp ECO – MAN’s innovative, fuel-saving, hybrid propulsion system. Four MAN 51/60DF engines will be at the heart of the propulsion system.

The 230m newbuilding is based on TT-Line’s ‘Green Ship’ design, developed in collaboration with Copenhagen-based designer, OSK-Shiptech, and is scheduled for delivery in 2022, serving TT-Line’s route network in the Baltic Sea. It will have the capacity for 800 passengers and over 200 articulated lorries. While designing the vessel, a particular emphasis was put on flexibility and fast, in-port turnaround-times. TT-Line currently has six ferries operating on various routes in the Baltic Sea. Operating on LNG, the new vessels will have 50% fewer emissions than TT-Line’s previous generation of vessels.

Lex Nijsen, Head of Four-Stroke Marine Sales – MAN Energy Solutions, said: “Running on LNG, our propulsion package will enable this vessel to operate on such low emissions that it will become the most environmentally friendly ro-pax ferry in the Baltic. Our business, to a great extent, is based on offering systems such as this that help our customers to increase the efficiency of their plants and reduce emissions, while leading the way to a carbon-neutral future.”

MAN Energy Solutions will provide the scope of supply in association with Aspin Kemp & Associates (AKA), in which it has a 40% stake. AKA specialises in power supply, energy management and drive systems for marine and industrial applications. Similarly, MAN Energy Solutions’ fuel-gas specialist – MAN Cryo – will supply the new vessel’s fuel-gas-supply system.

The package to be supplied by MAN includes:

  • 2 × 8L51/60DF + 2 × 6L51/60DF MAN engines offering a total power of 29,400 kW
  • MAN Alpha twin-screw CPP propellers
  • 2 × twin-in, single-out gearboxes
  • An MAN Cryo FGSS featuring 2 × 500-m2 vacuum insulated Type-C tanks
  • AKA’s advanced HyProp ECO system
  • AKA drives, electric generators and motors for the PTO and bow thrusters.

In respect to the last point, five different operational modes for the shaft alternator (PTO) will enable a fuel-saving power generation in combination with a smart and flexible supply of the bow thrusters.

The HyProp ECO is a system solution that combines a diesel engine with a frequency-converter-driven shaft-alternator/motor and features multiple operational modes. The system combines the advantages of a bi-directional operating frequency converter for the shaft machine with a high-efficiency CP propeller plant. HyProp ECO can also accommodate shore connection and the integration of energy-storage devices/batteries.

Nijsen added: “This order is the very first MAN dual-fuel, diesel-mechanical propulsion system for a ferry application, which reflects our strategic direction of developing sustainable technologies and solutions – as shown by the contribution of AKA and MAN Cryo. It also fulfills our desire to increasingly become a supplier of complete solutions."

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