both on-board and on-shore in ports and container terminals. Additionally, in vessels where the engine room is unmanned for long periods, the instruments can easily be connected to automatic bridge monitoring systems using standard industry protocols. Modern condition monitoring
devices such as these use high-precision laser-based technology linked to integrated sensing cells to measure particles down to a few microns in size. This enables the units to provide a considerably more accurate indication of contamination levels than popular but limited observational methods, which suffer from a degree of subjectivity and the potential for human error. This more accurate approach to
condition monitoring has a number of benefits, showing clearly the quality of fluids and also providing an early warning that the condition of other system components is changing. For example, an increase in the moisture content of an oil may be indicative that the seals on the cooling units are failing, while high concentrations of metallic particles can highlight the fact that the bearings are beginning to wear.
Filtration While monitoring the condition of oil provides a cost effective way to optimise the efficiency and life of hydraulic and lubrication systems, this can only be achieved if the technology is used together with effective filtration, preventing problems from occurring by ensuring that contaminants are removed before they can cause damage. A wide range of filters is available to
achieve this, including both in-line and off-line components. For example, the latest suction filters are designed to protect pumps effectively while at the same time making element changeovers simple and fast. Likewise, return filters can be fitted either in-line or in-tank, making installation easy and allowing effective filtration to be carried out on many different types of system. Return filters are excellent at catching particles that have entered oil from worn components or through degraded seals, before it enters the reservoir and is re-circulated around the system. Parker’s Duplex filters and automatic clean-up filters are proven solutions for marine lube systems.
“Off-line filtration solutions can extend the
service life of oils by continuously polishing the fluid”
Off-line filtration solutions can extend the
service life of oils by continuously polishing the fluid, even if the system is shut down. Specific cleanliness levels can be accurately achieved and maintained, while the discharge line can be directed to the main pump to supercharge the system with clean, conditioned fluid simply. With filtration carried out off-line, servicing is possible without the main system being shut down, enabling maintenance costs to be kept to a minimum. In addition to using effective, fit-for-
Parker Hannifi n FBO fi ltration unit is compatible with a range of fi lter elements.
purpose filters, it is vital that the filter elements are changed regularly. Often, filter elements are fitted and either forgotten about until a system malfunction occurs
Ship & Boat International November/December 2008
Parker Hannifi n’s ParFit fi lter element family (credit: Parker Hannifi n).
or until a major service is carried out. In each case it is likely that the efficiency of the filter element will have fallen below its optimum level long before a replacement is considered. Partially clogged or blocked filters can
add considerably to costs, being unable to remove particles that are potentially harmful to components, and to a reduction in oil circulation, which can lead to increased energy consumption for pumps. At a time when the cost of a litre of oil is higher than that of a filter element, the case for replacing elements regularly is clear.
Conclusion With the price of oil mounting pressure on ship owners and managers to increase the efficiency of their vessels, effective condition monitoring and filtration of hydraulic and lubrication systems offers a simple and cost-effective way to do so. By ensuring that oils continue to work
effectively for extended periods, the life of many different system components can be maximised, minimising both direct and indirect maintenance costs. Operators may be at the mercy of fuel prices, but by taking a proactive approach to maintenance as part of a wider strategy to increase vessel efficiency, they can continue to operate profitably. SBI
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