Featured Listings

MarQuip Builds Exhaust with Silencer and SCR

Image: MarQuip

Posted by Eric Haun

Manufacturer of underwater exhaust outlets and water-cooled exhaust systems MarQuip said it is creating a marinized IMO TIER III-certified exhaust system for an Italian shipyard. 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 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 system 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.
Production of the new silencer/SCR system has already started, and it is slated for delivery in the beginning of September.

Jul 17, 2017

Construction and Design
Layout on deck is entirely customizable to suit your needs. Whether you are in the market for a tender, a family cruiser or a weekend warrior, arrangement on deck can be tailored specifically to your style of yachting on any given day. (Photo: Rambler Yacht Co.)

Rambler Introduces New American Yacht Line

Rambler Yacht Co. has announced the Rambler 38, the first model in a line of new American yachts.

Emelina Joins The Burgess Sales Fleet

Burgess has announced that the 51m motor yacht Emelina has joined the sales fleet with an asking price of $23,950,000. The highly customized Emelina was built by a very knowledgeable owner who oversaw every facet of the design and build process. This meticulous attention-to-detail has ensured that E

(Photo: Oceanco)

World's Largest DynaRig Sailing Yacht Delivered

Oceanco Yacht delivered 106.7M (350 ft) Black Pearl— the largest Dynarig sailing yacht in the world.

All news in Construction and Design

Silver Lining (Photo: IYC)

IYC to Present 11 Yachts at PBI Boat Show

IYC will be presenting an impressive fleet of 11 yachts including 54m (164’) Silver Lining

Silent 64 (Photo: Silent Yachts)

World's First Solar Yacht Debuts

Silent Yachts announced that this week at the Palm Beach International Boat Show it will showcase

Book Ends (Photo: Heesen Yachts)

47m Book Ends to Debut in Palm Beach

Book Ends was delivered to her owner upon completion in June 2017.  The boat is now making her

All news in Power