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26  SUSTAINABILITY SPECIAL                                                                                                                                                                                                                        27
































                                                                                                                                     IMO TIER III                                               For Damen, the IMO Tier III NO  regulations represent a significant move
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                                                                                                                                                                                                towards cleaner and greener operations. Improving air quality in harbours
                                                                                                                                                                                                is an important issue, especially when taking their proximity to urban
                                                                                                                                                                                                locations into account. Damen has a large number of tug-owning clients
                                                                                                                                                                                                in the North Sea and Baltic Sea Emission Control Areas. Therefore the
                                                                                                                                     READY FOR                                                 “We started brainstorming sessions on this subject back in 2012,” says
                                                                                                                                                                                                significance of IMO Tier III cannot be overestimated.

                                                                                                                                                                                                Jeffrey Jacobs, Technical Manager Tugs. “Looking for the best NO
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                                                                                                                                                                                                emission reduction systems on the market, we had technical challenges and
                                                                                                                                     THE FUTURE                                                 exhaust emission reduction system with our engine silencers. To support
                                                                                                                                                                                                space was one of the limiting factors. Therefore we needed to combine an
                                                                                                                                                                                                our Damen philosophy by giving our customers the opportunity to choose
                                                                                                                                                                                                a green product with short delivery times, or deciding to easily upgrade
                                                                                                                                                                                                their vessels when needed, we set another requirement which was difficult
                                                                                                                                                                                                to meet.
                                                                                                                                                                                               “Being able to meet these tough requirements and provide our clients with
                                                                                                                                                                                                the standard, reliable, robust and Damen-quality products, suitable for
                                                                                                                                                                                                multiple marine diesel engines, we decided to develop our own Damen
                                                                                                                                                                                                after-treatment systems.”

                                                                                                                                     Explained IMO Tier III                                     80% reductions
                                                                                                                                                                                                With this decision a Damen After-Treatment Team was established. Its first
                                                                                                                                                                                                assignment was to develop a NO reduction system for the new generation
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                                                                                                                                                                                                of Tugs: the ASD Tug 3212, ASD Tug 2813, ASD Tug 2811, ASD Tug
                                                                                                                                     The International Maritime Organization’s regulations
                                                                                                                                     regarding nitrogen oxide emissions have got steadily stricter   2312 and RSD Tug 2513. This involved partnering with after-treatment
                                                                                                                                     over the last two decades. This started with the so-called   company Emigreen, he adds. “This partnership joins twenty years of
                                                                                                                                     IMO Tier 1 controls in 2000, and continued with IMO Tier II   knowledge, R&D and experience of after-treatment systems with 90 years
                                                                                                                                     in 2011. IMO Tier III entered force in 2016, but only in North   of experience of designing and building vessels.”
                                                                                                                                     American and US Caribbean waters. For the European market,
                                                                                                                                     Tier III regulations will come into effect in the North Sea and   The cooperation with Emigreen was fruitful, leading to an in-house
                                                                                                                                     Baltic Sea Emission Control Areas from 1  January 2021. This   designed and developed system which has been tested on multiple test
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                                                                                                                                     means that all vessels with an engine output greater than 130   benches. “The resulting Damen Marine NO  reduction system is a fully
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                                                                                                                                     kilowatts, with a keel-laying date after 2016 for US waters and   certified and type approved IMO Tier III system, reducing NO  emissions
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                                                                                                                                     2021 for North Sea and Baltic Sea waters entering these areas   by 80% compared with IMO Tier II requirements.”
                                                                                                                                     must comply with IMO Tier III regulations.
                                                                                                                                                                                                Plug and play
                                                                                                                                                                                                For owners of Damen’s new generation of tugs wanting to switch to IMO
                                                                                                                                                                                                Tier III, the process will be straightforward. “You can compare it to what we
                                                                                                                                                                                                have been doing for years with firefighting systems. We prepare the vessel
                                                                                                                                     Explained NO  reduction                                    as much as possible and then can install the optional equipment within a
                                                                                                                                                                                                matter of weeks – a plug and play technique.”
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                                                                                                                                     The Damen Marine NO  reduction system is an advanced active   Damen’s extensive preparations for NO  regulations have paid off: “We
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                                                                                                                                     emissions control system using SCR (selective catalytic reduction)   are showing the maritime market that we are ready for this sustainable
                                                                                                                                     technology for NO  reductions up to emissions standards    change. The first projects have been successfully developed, tested and
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                                                                                                                                     according to IMO Tier III, suitable for marine diesel engines and   delivered to our customers.” The Damen After-Treatment Team is currently
                                                                                                                                     fuels. It has been designed and optimised for the specific sailing   expanding its product portfolio to provide the numerous Damen Business
                                                                                                                                     profile of a vessel, and is able to operate on both high and low   Units with the best technical solutions for NO  reduction systems.
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                                                                                                                                     loads in ambient conditions from -30⁰C up to 45⁰C. Its robust
                                                                                                                                     design is suitable for high sulphur fuels (DMA ISO 8217:2017)   These can even be combined with soot reduction technology to comply
                                                                                                                                     capable of using both automotive (AUS32) and marine quality   with the new Euro Stage V requirements. “These are fit-for-purpose,”
                                                                                                                                     urea (AUS40). Combined with 45dB(A) silencers, the system limits   concludes Jeffrey. “And take into account the operational profile and
                                                                                                                                     the emissions of NO  and noise, thus contributing to a healthier   specific requirements of the variety of vessels, while keeping our standard
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                                                                                                                                     and more sustainable environment.                          product approach.”
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