Cummins has launched its first engine platform to receive IMO Tier III certification, the QSK60 engine package.
The International Maritime Organization (IMO) Tier III certified QSK60 engine package offers cleaner emissions and improved warranty and is available for a wide range of marine applications, from commercial workboats to luxury yachts.
QSK60
The QSK60, with modular common rail fuel system (MCRS) was introduced to the marine market in 2008. Its engine architecture has not changed, but Cummins has chosen selective catalytic reduction (SCR) to meet the new emissions requirements, while not changing fuel consumption.
To minimise total cost of ownership (TCO), the company has optimised diesel exhaust fluid consumption and aligned maintenance intervals of the aftertreatment with engine maintenance intervals for minimal planned downtime. Flexible installation arrangements also contribute to a decreased total cost of ownership, by reducing installation costs with eight different configurations to match different needs.
SCR System
The SCR system is fully serviceable, meaning the catalysts can be removed without the need for new or special tools and easily replaced when needed. Catalyst life is expected to match the engine life to overhaul, an example of aligning engine and aftertreatment maintenance intervals. In addition to the serviceability of the SCR system, the Vanadia-based catalyst is capable of tolerating up to 5000 ppm sulfur fuel.
Scheme A Approach
Cummins is offering a pre-certified system, using what is commonly referred to as a Scheme A approach, removing additional certification complexity from the equation for the shipyard, saving time and money on the total project. The Scheme A approach means the company has worked directly with an IMO-recognised agency to perform witness and emissions tests before the system arrives at the shipyard. The design is proven in the test cell to meet the emissions requirements and the various design configurations are all pre-approved.
Since this work has been done up front, no additional emissions tests are required once the construction is complete. This approach also ensures the engine and aftertreatment system work together and last over the life of the vessel.
