The latest generation of MTU’s Series 4000 engines equipped with the SCR system for ships has successfully completed the IMO Tier III certification tests. Representatives of the ABS, BV, DNVGL, KR, NK, LR and RS certification bodies initially tested the 20-cylinder version, which was awarded approval as being representative of the remaining versions. This means that the engines now comply with the emission regulations in accordance with IMO MARPOL Annex VI, IMO Tier III.

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.

For yachts 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 80m superyacht is scheduled for delivery in 2020.

MTU’s new integrated system consists of a propulsion system and SCR exhaust gas after treatment system, it is designed to require a minimal amount of space – space has been a major concern during IMO Tier III developments. Superyachts will be able to switch between IMO Tier II and Tier III modes during operation in order to comply with the emission requirements of the region in which the yacht is sailing in. MTU’s SCR system is fully controlled, with real-time NOx measurement both upstream and downstream of the SCR system.

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