MarQuip, the leading expert in underwater exhaust outlets and water-cooled exhaust systems, is creating a marinised IMO TIER III-certified exhaust system for a leading Italian yard. Working in close cooperation with its partners, the Dutch company has developed a fully custom module silencer/SCR system that will combine the working principles of Selective Catalytic Reduction – which eliminates most harmful NOX compounds – with highly efficient noise reduction.
The silencer/SCR module is fitted on MarQuip’s effective water-injection piece with underwater exhaust, and achieves a noise reduction of 35 dB(A) while complying fully with IMO TIER III NOX limitations. The marine-proof new system successfully fulfilled a range of requirements linked to the client’s needs and the engine specifications.
The first challenge was staying within the maximum backpressure specified by the engine manufacturer. This was particularly complicated by the fact that adding after-treatment equipment to exhaust systems can have the adverse side effect of increasing backpressure. MarQuip’s specially designed underwater scoop helped reduce backpressure significantly while staying well within the designated dimensions.
The second step was noise reduction. This goal was achieved by utilising the high-frequency noise reduction capabilities of the SCR unit and complementing them with a dedicated low and medium-frequency silencer part.
The third and last step was to make the SCR unit fit for marine use. MarQuip engineers knew from experience that pressure pulses in waves of up to 500 mbar in heavy weather cause equipment to undergo low cycle fatigue. They carried out strength calculations which showed that a standard SCR unit fails after only 600 pressure pulses. The design was strengthened accordingly, and its ability to withstand pressure pulses significantly increased. The new solution complies with the highest marine standards.
Production of the new silencer/SCR system has already started, and it is slated for delivery in the beginning of September.
The Monaco Yacht Show is the representative of the luxury yachting sector: shipyards, brokers, designers, equipment manufacturers and other luxury goods. Holland’s leading role in the superyacht industry has created a special relationship with the Monaco Yacht Show. Each year the Dutch pavilion is packed with visitors keen to see what our members have to offer, and the quays also have many Dutch superyachts on the show.
Personality, stability, Heritage … and much more besides await you. Join us as we showcase 10 stands of Dutch suppliers, all packed with new innovations. Enjoy the Dutch hospitality and share your thoughts with specialists from every area of the Dutch superyacht industry.We look forward to seeing you in our Holland Pavilion to give you all the information you need about our members!
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