What MAN Diesel & Turbo said is the largest and most powerful engine the company has designed and built has entered service.
Built by Doosan Engine in Korea and rated at 75 570 kW, the MAN B&W 11G95ME-C9.5 two-stroke engine is the prime mover aboard the MSC Jade. The 19 437-teu container vessel is operated by Mediterranean Shipping Company (MSC), the global container shipping company. Daewoo Shipbuilding (DSME) delivered the newbuilding in May, which subsequently sailed the short tour to Busan, Korea. The ship also uses four MAN L32/40 auxiliary engines—two 8L32/40 and two 9L32/40 units—each with a single MAN NR34/S turbocharger.
The engine is the first in a series of six ordered by MSC, with a second sister-vessel shortly scheduled for sea trials and two further vessels, currently finishing construction at Samsung Heavy Industries, due for sea trials during June.
“We attribute the G95’s popularity in this segment to its ability to provide sufficient power for such vessels to reliably achieve their desired operating speed,” said Ole Grøne, senior vice president, Low-Speed Sales and Promotions, MAN Diesel & Turbo. “Here, the G95’s rpm ensures that a propeller of optimal size can be employed, in turn delivering a low fuel-oil consumption for an optimal fuel economy.”
The ‘G’ prefix before an engine means it has a design that follows the principles of the large-bore, Mark 9 engine series that MAN Diesel & Turbo introduced in 2006 with an ultra-long stroke that reduces engine speed, which helped pave the way for ship designs with higher efficiency, the company said.
G-type engines’ longer stroke results in a lower rpm for the engine driving the propeller. This lower optimum engine speed is designed to allow the use of a larger propeller and is, ultimately, significantly more efficient in terms of engine propulsion, the
The engine, with a bore of 950 mm and a stroke of 3 460 mm, provides 6 870 kW/cylinder at 80 rpm and 21 bar MEP (in L1) and was introduced as a supplement to the S90ME-C9/10 engine types, allowing the engine to be further de-rated thanks to the larger cylinder bore and/or fewer cylinders to be installed, the company said.
Following this trend, as well as those for cost-down and downsizing, the S90ME-C has recently been supplemented with a G90ME-C10 version.
MAN Diesel & Turbo said that since August 2013, 68 of the G95 engines have been selected for the large capacity container market—container ships ranging in size from 9,000 to 21 000 teu, and in 8- to 11-cylinder versions.