Two-stroke power for multi-role ro-ros

08 Mar 2011
MAN Diesel & Turbo's 8S40ME-B9.2 will be employed in a twin-screw configuration

MAN Diesel & Turbo's 8S40ME-B9.2 will be employed in a twin-screw configuration

MAN Diesel & Turbo reports that Danish ferry operator DFDS has signed a contract for the construction of two ro-ro vessels, each to be powered by two MAN B&W 8S40MEB9 engines.

The ships are to be built by P+S Werften in Northern Germany, and are scheduled for delivery in 2012. The ‘multi-role’ label comes from the fact that the ships will meet the parameters laid down by the Danish-German ARK military project for the deployment of military material, but at the same time the design is tailored towards operation on the DFDS commercial network.

Each ro-ro will be powered by two MAN B&W 8S40ME-B9 main engines, rated 2 × 9,080 kW at 146 rpm, in a twin-screw configuration with each engine driving an Alpha Mk. 5 type VBS1350FF-ODS high-efficiency propeller. The FF-type propeller features a full feathering pitch position and employs the Alphatronic 2000 control system. This will allow a service speed of 18.6-18.7 knots on DFDS’ North Sea service, with a contracted maximum speed of 20.5knots. When sailing in military convoys, speed will be reduced to around 12 knots, on a single engine with the other engine stopped and its propeller fully feathered.

The ships will have a-capacity of 3,000 lane metres and room for 342 TEU on the weather deck – a special requirement of the ARK project. The ships will have an electrical system designed for fixed and floating frequencies, for which three MAN Holeby 16/24 gensets have been chosen for each vessel. The propulsion package also uses shaft-line tunnel gears for PTO-drive.

Ole Grøne, senior vice president low-speed promotion and sales, MAN Diesel & Turbo, said: “This order represents a very interesting reference for our company. Not just because of the engines and the overall specifications, but also the unusual, multirole nature of the vessels. Such vessels require multiple operational and propulsion modes built into their design. DFDS has chosen our ME-B engines as they are more flexible in relation to the significant operational variations that ARK ships experience.”

Grøne continued: “DFDS can safely be called front-runners when it comes to efficient ship and propulsion-package designs. In fact, between 2003 – 2006 we delivered six 60-bore MC engines for its successful ‘Flower’ series of ro-ro vessels where DFDS’s choice of low-speed engine broke with previous norms.”

In 2010, Germany extended its partnership in the Danish-led ARK project up to 2021. This provided the necessary incentive to DFDS – the current, commercial party in the project – to order specially modified tonnage included in the extended agreement.

With the new ro-ro order, the ARK project will have five ships at its disposal by mid-2012 that fulfil a list of special requirements. According to the terms of the ARK project, one ship will be chartered full-time by the Danish-German military while the others will operate normally on commercial schedules but, upon request, can revert to military use within 15-60 days.

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