Type approval for MAN dual-fuel genset

The TAT on 2 November included tests of the engine’s alarm and safety system (SaCoSone), dual-fuel safety concept (including a test of the pilot-fuel system), load-step performance and a components inspection. The engine was also granted a certificate for compliance with IMO Tier III regulations in gas mode without any after-treatment equipment.

The five-cylinder test engine in China had an output of 125 kW per cylinder at a nominal speed of 720/750 rpm. In addition, the engine can provide up to 110% power output (against its rated output) in both gas and fuel modes.

Finn Fjeldhøj, head of small-bore, four-stroke engineering, MAN Diesel & Turbo, said: “The L23/30DF covers a power range of 625-1,200kW, which makes it particularly attractive for such ocean-going vessels as bulkers of most sizes, general cargo ships, chemical tankers, and smaller LNG-carriers, as well as ships operating in ports and near the coast.”

Baltic dry bulk operator ESL Shipping has already ordered the first six L23/30DF gensets for two 25,000-dwt cargo carrier newbuildings, currently under construction at CSC Jinling shipyard in China.

The MAN L23/30DF boasts a simplified fuel injection system, with the main injector valve also used for the injection of pilot oil. Accordingly, the MAN L23/30DF requires fewer parts to be replaced than other dual-fuel engines, offering a time between overhaul of 36,000 hours.

The engine is based on the conventionally fuelled MAN L23/30H. MAN said the engine – the first version of which was launched in 1965 – is popular with shipowners for its reliability and ‘forgiving’ service demands.