IMO 3 Compliance Issued
09 November 2017
Caterpillar announced the Motoren GmbH & Co. KG facility has received IMO 3 notice of compliance from the classification society DNV-GL for its M 25 E medium-speed marine engine platform.
Caterpillar said Motoren GmbH & Co. KG is one of the first engine manufacturers to release an IMO 3 factory certified medium-speed engine group for main propulsion and auxiliary applications.
“Customers seeking an IMO 3-certified engine solution now have the choice to select a serialized certified engine product which guarantees safe and reliability vessel operation, while meeting the latest emission standards,” said Detlef Kirste, product definition specialist for Caterpillar Marine.
The M 25 E utilizes selective catalyst reduction (SCR) technology and exhaust gas temperature management. SCR works by injecting urea into the exhaust stream; a catalyst helps convert nitrogen oxide into harmless diatomic nitrogen carbon dioxide and water vapor.
The Cat SCR technology is a closed-loop system that senses required NOx reduction, adjusting the amount of urea injected appropriately.
“This closed looped control, along with advanced engine combustion calibration, ensures exhaust gas temperatures are intolerance for the SCR catalyst and for cost-efficient SCR operation,” Kirste said. “This eliminates the risk of catalyst damage that could occur from too high and too low exhaust gas temperatures as well as urea overdosing, seen in many of today’s installations.”
The engine also utilizes an optimized charge air system for increased back pressure capability allowing for a much smaller SCR system. The M 25 E engine comes in six-, eight- and nine-cylinder configurations and has a bore and stroke of 255 x 400 mm. Its power range is 2100 to 3100 kW.
Caterpillar’s SCR technology minimizes total cost of ownership by cutting the diesel and urea expenses by offering the lowest total fluid consumption. “Our SCR systems are constantly monitored and require minimal routine maintenance, and most importantly, lifetime is aligned to meet or exceed engine overhaul intervals,” said Kirste.
The system approach of SCR technology with the engine control and monitoring system linked together, make the M 25 E unique in the 1.8 to 3.15 MW medium-speed marine engine power range. Scheme A pre-certified M 25 E engines can be installed and commissioned without onboard emission verification tests. This allows the shipyard to avoid testing and certification related costs and to plan for shortest commissioning times.
The MaK M 25 E engine will be delivered with factory EIAPP certification and backed by the worldwide Cat dealer network.