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Presentation at the International WorkBoat Show; compact and lightweight design; comprehensive performance portfolio for workboats from 324 to 1213 kW, US Tier 4 compliant.

© MAN Engines. The modular exhaust after-treatment System from MAN Engines consists of few components, making it compact and light.

At the International WorkBoat Show in New Orleans, LA, MAN Engines presented its modular exhaust after-treatment System (EAT), which meets the requirements of the US Tier 4 emissions standard for workboats.

This system stands out due to its great flexibility and extremely compact design, which are a distinct advantage in the varied installation situations on workboats, in which space is at a premium. The engineers of MAN Engines achieved this pioneering result by making the components freely placeable, allowing for an enormous range of variants of the EAT. This gives boat designers access to flexible system integration options with a high component density in a myriad of different installation situations.

But the essentially maintenance-free exhaust after-treatment System is also a particular benefit to end users: it allows the engine to be designed with a very favorable characteristics curve, so that the same performance can be achieved with lower fuel consumption. Thanks to the SCR catalyst being coated with vanadium, it is resistant to sulphur as well, and can therefore also be used in countries where only low-quality diesel fuel is available.

The modular exhaust after-treatment System is made up of an SCR (Selective engines and V engines from the industrial sector. Successful field trials for workboats are already in progress.

The US Tier 4 emissions standard applied from 1 October, 2017 for all workboats flying US flags with a power output of more than 600 kW (816 hp) per combustion engine. For diesel engines, the legislation includes a reduction in nitrogen oxides (NOx) of nearly 68 percent to 1.8 g/ kWh, as well as a reduction in particulate emissions of nearly 64 percent to 0.04 g/ kWh.

The legislation stipulates that, following a grace period, all workboats built after 1 October, 2017 with a power output of more than 600 kW (816 hp) per engine must be equipped with an exhaust after-treatment System. With its 6-, 8- and 12-cylinder engines, MAN Engines is therefore offering a comprehensive range of power outputs from 323 to 1213 kW (440 to 1650 hp) for the US Tier 4 emissions standard.

As part of this, all 12-cylinder engines in the D2862 series are fitted with the modular EAT. This can be incorporated into projects from now on.

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