G45 ‘green’ engine gains type approval

14 May 2015
The new MAN G45 engine features a fully electronically-controlled system that is said to optimise a vessel’s ‘green’ profile

The new MAN G45 engine features a fully electronically-controlled system that is said to optimise a vessel’s ‘green’ profile

The world’s first 45-centimetre bore, ultra-long stroke, low-speed engine, MAN B&W 5G45ME-C9.5, has passed its type approval test.

Development of the new MAN G45 engine, built by STX Heavy Industries, focused on reducing exhaust gas emissions to a minimum, while the introduction of a fully electronically-controlled system that is said to optimise a vessel’s ‘green’ profile.

MAN offers the example of a G45 installed aboard an 800-teu container ship to show a typical application for the new engine type.

Given a design draught of 8m for the vessel a 5.7m four-bladed propeller could be used. With this propeller and a service speed of 17 knots, MAN says an SMCR engine speed of around 105 rpm would be optimal and the SMCR power would be around 6,070 kW. At a normal continuous rating of 5,465 kW, a typical, modern, low-speed engine would have a specific fuel-oil consumption of 166 g/kWh, resulting in a daily fuel-oil consumption of 24.2 t/day.

In contrast, MAN says applying a B&W 6G45ME-C9 unit using the same parameters, the specific fuel-oil consumption would be 161.4 g/Kwh – a significant reduction in the daily fuel-oil consumption of 2.85%.

In addition, further improvements can be made, according to MAN, by increasing the propeller diameter to make use of the G-engines lower shaft-speed range.

MAN says the reason for introducing the G-type engine is to help the industry meet the changing optimum propeller speed of oceangoing ships and reducing the impact of CO2 emissions from ships and therefore the fuel consumption.  

The new engine is the first in a series of eight individual main-engines bound for vessels currently under construction by Chinese shipyard NanTong Sinopacific Offshore and Engineering Co Ltd and ordered by Odfjell.

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