2-stroke diesel marine engines with FIVA valves from Bosch Rexroth consume less fuel and operate with minimum emissions. The specially tailored maintenance program oﬀered by Bosch Rexroth‘s Marine Service forms the basis for ensuing optimum performance is maintained costeﬃciently throughout the entire life cycle. Owners, superintendents and crew members can draw on the ﬁve measures outlined below to make their ship operation even more proﬁtable, simpler and safer.
Ships‘ engines must operate reliably around the clock. At the same time, however, they should also ensure the lowest possible emissions and minimum operating costs. This can only be achieved with optimum control of the fuel injection and exhaust gas outlet. Bosch Rexroth‘s hydraulic servo valve is designed to follow the performance curve of large 2-stroke diesel engines precisely, thus allowing fuel consumption and NOX emissions to be minimized. When it comes to ensuring reliable operation, another key aspect is optimum ease of handling: Bosch Rexroth‘s FIVA valve fulﬁ lls this requirement thanks to its integrated electronics. The complete valve can be replaced during a service call without adjustment. This signiﬁcantly reduces failure times, unproductive layovers and ultimately maintenance costs. The total cost of ownership can be further reduced however by drawing on the special maintenance oﬀ ered by Bosch Rexroth‘s Marine Service. Why is this the case? These are the reasons why:
WHY DO BREAKDOWNS HAPPEN AT SEA?
The best engine is only as good as its components. When shipping companies opt for FIVA valves from Bosch Rexroth, they know that they have chosen a robust and high-precision solution. Yet, like any hydraulic valve, this component does not remain wear-free either and also operates under harsh conditions. In extreme situations and where maintenance is deﬁcient or neglected, spontaneous failures can also happen on occasion.
Cause 1: Overheating of the electronic controls
The temperature exerts an enormous inﬂuence on the lifecycle of the electronics. If FIVA valves are used with a proportional valve as a pilot, electronics failures caused by overheating represent the most frequent cause of failure during operation. The reason for this is that the mechanical principle of operation requires high currents of up to 3.5 A. In contrast, the FIVA valve from Bosch Rexroth with servo pilot valve is controlled with just up to 0.03 A. Compared with proportional valves, considerably less waste heat is therefore generated, which together with the high temperatures and vibrations in the engine room loads the electronic controls and can lead to premature failure.
Cause 2: Contaminated engine oil
Control valves in marine diesel engines do not have their own hydraulic circuit, rather use engine oil, which is fed by the pump through a ﬁlter system. The problem with this is that if the oil cleanliness is inadequate, smaller particles can impair the precision of the pilot valve and main stage of the FIVA valve over time. If the particles are larger, clogging in the pilot valve can even cause malfunctions. Simple plug & play replacement of the pilot valve provided as a spare part can help here (see point 4).
5 POINTS FOR RELIABLE ENGINE PERFORMANCE
The following ﬁve measures will help you to avoid unnecessary costs and ensure smooth and optimum operation:
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Author: Volker Tenhaeff
Job title: Head of Global Service Support
Volker is the head of Global Service Support for Industrial Hydraulics at Bosch Rexroth. He has more than 8 years of global experience in sales, service and application engineering in hydraulic drive systems for various industry sectors like metallurgy, marine & power generation. He holds a Master of Engineering in mechanical engineering from Technical University Munich, Germany.
Author: Luc Staub
Job title: Senior Manager Global Ship Service
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