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IMO Tier III certificated

3/22/2018 | Words: Silke Rockenstein | Pictures: MTU


The latest generation of MTU’s Series 4000 engines equipped with the SCR system for ships has successfully completed the IMO Tier III (MARPOL Annex VI) certification tests in the presence of representatives of the ABS, BV, DNVGL, KR, NK, LR and RS certification bodies.Thereby the systems have been given the approval to sail in IMO III areas (emission controlled areas). 

With a variety of technical advances to the turbocharging system, the combustion process and the injection system of the engines combined with MTU’s new SCR system, NOx emissions have been reduced by 75% compared with IMO II and particulate emissions by 65% compared with EPA Tier 3. An additional diesel particulate filter is not required.

MTU Series 4000 with SCR for workboats: Customers benefit from a perfectly integrated concept for IMO Tier III and EPA Tier 4 comprising an MTU drive and SCR system which is compact and which offers an excellent power-to-weight ratio. 

For yachts and patrol boats the engines are currently available from MTU as 12, 16 and 20-cylinder versions for a power range extending from 2,160 to 3,900 kW. The first yacht to be fitted with an IMO Tier III propulsion system from MTU (2 x 16V Series 4000 M73 engines + 2 x SCR systems) is currently under construction at the Istanbul-based Bilgin Yachts shipyard. The 80-metre long megayacht is scheduled to be commissioned in mid-2019. 

For work boats such as tug boats and ferries, MTU will gradually be introducing the engines complying with IMO Tier III and EPA Tier 4 emission regulations onto the market as 12, 16 and 20-cylinder versions covering a power range from 1,119 to 3,220 kW. The work boat engines will thus offer a 45 per cent increase in output compared with the predecessor versions and will thus be the only high-speed work boat engines delivering an output of up to 3,220 kW. In addition to power ships output and environmental compatibility, life-cycle costs were also a key focus during the development of the new MTU engines, the aim of which was to create significant benefits for ship owner/operators. It was also possible to reduce fuel consumption by a further 5 per cent compared with the predecessor model. MTU has already delivered the first EPA Tier 4 compliant propulsion systems for new catamarans operated by the WETA (Water Emergency Transportation Agency) in California.

Flexible: MTU’s new SCR system
MTU’s new integrated system consisting of propulsion system and SCR exhaust gas aftertreatment system, is requiring a minimum of space. It is designed for flexible installation and features an excellent power-to-weight ratio. MTU’s SCR system is fully controlled, with real-time NOx measurement both upstream and downstream of the SCR system. This ensures that the precise amount of reactant is introduced. Besides the IMO Tier III certified engines, MTU will continue to offer IMO Tier II engines.

New ships built after 1 January 2016 that are operated in so-called Emission Control Areas, (referred to as ECAs) on the North American coast and in the US Caribbean ECA, must comply with NOx limits in accordance with the IMO Tier III requirements as defined in MARPOL Annex VI regulation. Next ECAs will be North– and Baltic Sea from 2021. EPA Tier 4 applies to US flagged vessels (vessels registered and operated in US). 


The content of the stories reflects the status as of the respective date of publication. They are not updated. Further developments are therefore not taken into account.

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