21 November 2006 — In October 2006, MAN Diesel tested its new 51/60 DF engine (bore 510 x stroke 600 mm), a technology engineered for use in conjunction with LNG carriers. The DF engine is a dual-fuel power unit capable of running on boil-off gas from the tanks of LNG carriers or on conventional liquid fuels as back-up. It has been developed to give LNG carrier operators a more efficient alternative to propulsion systems based on steam turbines and offers a market-leading output of 1000 kW per cylinder. The full 51/60 DF range comprises inline versions with 6, 7, 8 and 9 cylinders and vee configuration versions with 12, 14, 16, and 18 cylinders.
For the three stagings of its “Dual Fuel Demo � 51/60 DF Live on Stage” MAN Diesel invited representatives from the main groups involved in the selection of LNG carrier propulsion systems to its headquarters in Augsburg, Germany. Each event hosted major ship owners, ship builders, ship charterers (oil and gas companies) and marine consultants from the LNG sector, and comprised two intensive days of lectures, and discussions. The highlight was a demonstration run of the 51/60 DF engine on the company test stand where guests witnessed the engine at full load and its capability to switch smoothly from gaseous fuel to liquid fuel without interruption of propulsion power.
As well as the technology of the 51/60 DF engine, MAN Diesel also emphasised its overall systems competence in LNG carrier propulsion, supported by gaseous fuel supply system specialists Atlas Copco and classification society Det Norske Veritas (DNV). Likewise, the economic aspects of LNG transportation formed a major part of program, as did the subject of operational safety, where MAN Diesel presented the detailed safety concept it has developed for LNG carriers and which has already been approved in principle by DNV and Lloyds Register.