Kidde Fire Protection
MK6 OIL MIST DETECTION SYSTEM
Crankcase explosions due to ignition of oil mist can be disastrous to both vessel and crew, so marine safety equipment on board must be capable of dealing with a possible hazard in seconds. Since the potential hazard was first identified some 50 years ago, the Graviner oil mist detector has been used to monitor oil mist levels on many thousands of merchant ships and has been supplied to almost every ship-owning nation.
Benefits
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Multi-engine capability |
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High scan rate – 64 detectors in1.2 seconds |
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Complete flexibility – up to 8 engines on a single system |
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Pipe-free installation |
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Compact detectors mounted on engine with plug/socket connection |
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Control unit located in enginecontrol room or other suitable location, connected to detectors via junction box |
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Low initial cost and simple to extend |
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Simple cable run between engine and control unit |
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24v DC operation |
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No air supply or extractor fans needed |
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Event Log |
Efficiently lubricated machinery is as critical to the reliability and operating safety of modern diesel engines as it has always been. Rapid advances in lubrication technology and the latest computer aided production techniques have done much in recent years to significantly improve both marine and landbased diesels.
Occasional mechanical failures in the crankcase are inevitable. A minor problem with a bearing shell for example, will cause a ‘hotspot’ and generate large volumes of oil mist. If not detected quickly, major damage may be caused to the crankshaft and a crankcase explosion may result. Such occurrences may lead to time-charter delay, loss of revenue, salvage claims or even, in extreme cases, serious injuries or fatalities and loss of the vessel. The sensitivity of early oil mist detectors enabled very advanced warnings to be given of incipient bearing failures. In two-stroke engines, warnings were given up to 5-6 hours before any problems became apparent. As engine design improved, power outputs and bearing loads increased and tolerances to failure rapidly decreased.
To keep pace with these trends, oil mist detector design improved in terms of better sampling and faster response times. The time has now arrived where no further fundamental improvements can be made to existing system concepts, so a radical reappraisal of Oil Mist Detector operating principles was required. The new Graviner Mk6 OMD is the result.
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