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MAN Diesel & Turbo reports that its dual-fuel MAN L23/30DF engine successfully passed its type approval test (TAT) on November 2 at CSSC Marine Power (CMP), Zhenjiang, in front of the industry's main classification societies.

The five-cylinder test engine in China had an output of 125 kW per cylinder at a nominal speed of 720/750 rpm.

The TAT included tests of the engine's dual-fuel safety concept (including a test of the pilot fuel system), load-step performance and a components inspection.

The MAN L23/30DF's fuel injection is a simplified system, especially developed for high reliability and cost efficiency as the main injector valve is also used for the injection of pilot oil.

Finn Fjeldhoj, Head of Small-Bore, Four-Stroke Engineering – MAN Diesel & Turbo, remarked: "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. Encouragingly, shipowners around the world have already shown significant interest in the engine and we are very optimistic about its future prospects."

MAN points out also that the engine also requires relatively low investment costs as fewer parts need to be replaced, as evidenced by its extreme time between overhaul (TBO) of 36,000 hours.