New MAN engine gets type approval

The approval has been conducted in compliance with DNV rules for the classification of ships as well as high-speed light craft and naval surface-craft. The type approval covers a rating of 9,100kW at 1,000 rpm for 100% MCR and an additional 10% overload capacity for one hour every six hours of 10,000kW at 1,032 rpm. The four-stroke, medium speed engine is accordingly claimed to be the most powerful and fuel-efficient diesel engine in its class worldwide.

The V28/33D engine range has 12-, 16- and 20-cylinder configurations, a design featuring a high power density while maintaining full compliance with IMO-II and EPA Tier-II legislation.

The 280mm bore and 330mm stroke engine, developed from the former Ruston RK270/280 design, features a simple, functional and compact approach with a minimal number of components and is tailored for three main segments: multiple propulsion applications including all types of fast ferry, naval ships, super-yachts, an STC (sequential turbocharging) edition, and as gensets for offshore applications.

The new engine is characterised by its favourable power to weight ratio, high performance, shock resistance, quiet running and high reliability for maximum availability. The company claims that with its ease of installation and maintenance, it is a textbook example of a diesel engine featuring low operation and life-cycle costs.

Additional design features include a new, in-house-developed safety and control system, SaCoSone, and the new, high-efficiency TCA33 turbocharger, which has been optimised for the V28/33D engine. Due to its high pressure rate, the turbocharger can reach values of up to 500kW per cylinder.

The challenge of meeting the new, IMO-II and EPA Tier-II emission regulations, while maintaining the fuel-consumption and smoke-emission levels enjoyed by the 28/33D, has been overcome through the intensive development of an ‘Emission Tier II package’ that includes:

· optimised injection system;

· optimised combustion chamber;

· Miller cycling;

· a high-efficiency, charge-air cooler;

· improved NOx/SFC/soot trade-off; and

· simple customer connections (easy installation).

Type approval from the remaining classification societies is planned for later in 2010 and the first upgraded 20V28/33D engines on order are scheduled for delivery in the autumn.