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LESS is more for cruise control In-depth | PROPULSION


Caterpillar Marine Power Systems says that its latest ‘MaK Large Engine Protection/Safety System’ (LESS) reduces the time required for engine installation, commissioning and maintenance.


speed marine engines, comprising the M 25 C, M 32 C and M 43 C series. Currently, the technology suits main engines driving a Controllable Pitch Propeller (CPP). Now, a version tailored to easing operations of multi-engine plants, such as those used on large cruise vessels, is also being offered. MaK LESS, which is type-approved by


T


leading classification societies, integrates different functions involved in engine monitoring and control by using two small, resiliently mounted control boxes at the back of the engine. Te first contains


he MaK LESS package is said to be playing a pivotal role in the selection of larger MaK long-stroke medium-


the engine protection system, the revs/ min switch unit, the start/stop control, an LED display and a graphic display. Te second box contains the complete engine monitoring system and MODbus data output to the alarm system. Tis box can also be fitted with an exhaust gas mean value system as well as control devices for main and big-end bearing monitoring. If the MaK DICARE engine monitoring and maintenance system is onboard, CANbus data output to the DICARE PC will also be placed in the second box. Caterpillar says the LESS technology,


which is delivered ‘as-is’ to the yard, “has advantages for everyone involved


New EGR enters market


A new exhaust gas re-circulation (EGR) unit is making a significant impact in the Norwegian market for high and medium speed engine applications in the maritime and offshore sectors.


M


arine DNOx has been developed by a partnership involving STT Emtec and AS Nymo.


Norway recently established a ‘NOx-fee’,


bringing an immediate incentive for operators of coastal ships to apply NOx-reducing measures. In Europe and North America demands are simultaneously increasing for reduced pollution from offshore installations and ships. Marine DNOx has been developed


specifically for small- and medium-sized vessels in the maritime and offshore sector. STT Emtec is manufacturing the Marine


DNOx unit at its production facility in Sweden, while Nymo is responsible for distribution, installation and marketing of Marine DNOx throughout Norway to the maritime and offshore communities. EGR is a well-known and cost-effective


method for reducing NOx from automotive diesel engines. By recirculating a part of the


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exhaust gas back to into the air inlet, the formation of NOx in the combustion process can be cut. It is estimated that NOx emissions can be reduced by up to 50%. Te marine DNOx technology is a stand-


alone system specifically suited for retrofit installations due to limited space requirements and without any engine modification. Te partners say the Marine EGR system will be a cost-effective alternative to existing technologies, such as SCR and engine upgrades, especially in retrofit applications where limited space in enginerooms can be a considerable challenge. To date, the system has been specified for


20 vessels in Norway, with installation of the system taking around one week. Caterpillar dealer Pon Power has also


said that it will take responsibility for commercialising the product when associated with all MaK engines and gensets in the range of 7000kW to 16,000kW. NA


– the vessel operator, shipyard, engine manufacturer and commissioning dealer.” The shipyard saves installation time and space because there are no separate electronic components and less wiring. Engine commissioning is quick and easy because pre-tests and class approvals are done at the factory and there is reduced potential for wiring mistakes at the yard. Finally, the vessel operator is said to benefit from the integrated protection/safety system because there is maximum engine availability and minimum risk of failures. Should failure occur, however, the affected sensor or actuator is highlighted in the LESS display for easy repair or replacement. NA


Schematic diagram of the EGR system. The Naval Architect April 2009


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