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RO/RO

May 4, 2010

MAN Diesel & Turbo power for advanced RO/RO

Built at the Bahia de Cadiz shipyard of Spanish shipbuilder Navantia, the 209 m roll-on/roll-off vessel Jose Maria Entrecanales is powered by four MAN 9L48/60B main engines and three MAN 8L21/31 auxiliary engines. It is the first of two RO/RO's with this engine configuration ordered by Acciona Transmediterranea, a division of the Acciona group..

The twin vessels are the largest in the Spanish market in terms of RO/RO cargo capacity and speed.

The Jose Maria Entrecanales' four nine-cylinder MAN 48/60B main engines each deliver 10,800 kW at 500 rpm. This configuration is widely used in tankers, cruise liners and containerships.

The 48/60 series has been redesigned recently to further improve performance. Primarily, this concerns the cylinder head where a higher-pressure injection results in improved atomization and better combustion, ultimately reducing both fuel consumption and emission levels. The cylinder head also contains a system for automatically adjusting injection timing (VIT) to minimize NOx emissions.

The TCA axial-flow turbocharger that MAN Diesel & Turbo initially introduced to the market in 2001 also plays a vital role in the success of the 48/60B engine and the Jose Maria Entrecanales has integrated the TCA66 model into its propulsion system. The turbocharger•s components have been optimized with regard to flow control and stress reduction through 3D-modeling, CFD and FEM calculations, resulting in highly resistant turbine blades. In addition, the removal of the turbocharger•s damping wire has also improved efficiency and facilitates maintenance.

Another new design feature is the incorporation of high-performance thrust bearings and floating bushes to minimize mechanical losses and improve turbine performance. Furthermore, inspection of the thrust bearing no longer requires removal of the shaft.

Auxiliary engines

The new RO/RO cargo vessel features three eight-cylinder, auxiliary MAN L21/31 engines, delivering 1,935 kW per engine at 1,000 rpm and characterized by a pipe-less design that includes:

a front-end box housing cooling-water pumps, thermostatic valves, fuel-oil and lube-oil pumps, a lube-oil cooler and a lubricating-oil filter

a cylinder-unit concept including cylinder heads, liners, pistons, connecting rods and fuel-injection valves. This enables the swapping in of a spare cylinder unit aboard, dispensing with the need to break voyages to return to the workshop in the event of breakdown

Delivered in March, the Jose Maria Entrecanales is now operating on the Barcelona - Alicante - Las Palmas de Gran Canaria (Canary Islands) - Santa Cruz de Tenerife - Agadir (Morocco) - Barcelona route. This requires a significant cruising speed to complete the weekly round-trip of 1,500 nautical miles.

RO/RO ENGINE ROOM

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