Mk6 Oil Mist Detection System For Engine

We are providing sales and service for Oil Msit Detectors and  keep spares for Mk6 and Mk7 models. Supporting brand in all Turkish ports and shipyards. Retrofits and upgrades old systems to Mk7.

Famous model on market

Graviner Mk6 is well known brand and model in ship industry.

1 Controller and 8 engines

The Mk6 Oil Mist Detection System is an analogue addressable oil mist detection system, capable of Monitoring up to 64 detector heads fitted on up to 8 engines. Each detector head monitors a single crankspace. It is a stand-alone device and assigned a unique address. It gathers oil mist density data and converts it to a signal for the control unit.

Mk6 Oil Mist Detection System Benefits

• 1 Control unit can monitor 8 engines and 64 detector
• Each detector head monitors a single crankspace.
• Analog addressible makes local monitoring for each detector
• All detectors can work stand alone
• Market leader brand
• Easy to access service and spares all around the world
• No delay on smoke detection
• RS485 commuication between detectors and control panel
  Certified by mayor marine class.

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 more than 50 years ago, the Graviner Oil Mist Detector (OMD) has been used to monitor oil mist levels on many thousands of merchant ships and has been supplied to almost every ship-owning nation.

Mk6 Oil Mist Detection System Benefits

• Multi-engine capability
• High scan rate – 64 detectors in 1.2 seconds
• Complete flexibility – up to 8 engines on a single system
• Pipe-free installation
• Compact detectors mounted on engine with plug/socket connection
• Control unit located in engine control room or other suitable location, connected to detectors via junction box
• Low initial cost and simple to extend
• Simple cable run between engine and control unit
• 24v DC operation
• No air supply or extractor fans needed
• 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 land-based 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 Graviner Mk6 OMD is the result.

Mk6 Oil Mist Detection System Approval

American Bureau of Shipping (ABS)
Bureau Veritas (BV)
China Classification Society (CCS)
Det Norske Veritas (DNV)
Germanischer Lloyd (GL)
Korean Register of Shipping (KRS)
Lloyd’s Register (LR)
Nippon Kaiji Kyokai (NKK)
Polish Register of Shipping (PRS)
Registro Italiano Navale (RINA)
Russian Register of Shipping (RRS)

The crankcase of any diesel engine will contain oil mist which is formed by condensation of oil vapour. The generation of oil vapour depends on temperature. Under normal conditions, generation of mist and its recombination into liquid oil will be in equilibrium and a constant level of oil mist density will be present.

When an incipient mechanical failure generates a ‘hotspot’, generation of oil mist increases rapidly and far exceeds the re combination rate. It is this rapid increase in oil mist which must be identified at an early stage, thereby giving warning of the incipient mechanical failure and initiating actions that prevent the oil mist density rising to an explosive level.

Mk6 Oil Mist Detection System Existing Systems

Oil mist detection requires a means of obtaining mist samples for measurement. This has always been achieved by means of a system of sample pipes fitted to the side of the engine. Later systems with individual detector heads still required some pipework. In addition, internal or external fans or pneumatic air movers were required to obtain the samples for analysis. Engine builders and owners have for some time called for a more flexible approach: A system which is simple to install, with no pipework and with no controls in the engine room. The Graviner Mk6 Oil Mist Detection System meets all these requirements.

Mk6 Oil Mist Detection System Description

The Mk6 OMD is an analogue addressable oil mist detection system, capable of monitoring up to 64 detector heads fitted on up to 8 engines. This is achieved without sample pipes and with minimum cabling. Each detector head monitors a single crankspace and is a stand-alone device. When assigned a unique address and supplied with 24V DC it gathers oil mist density data and converts it to a digital signal for transmission via the data cable to the control unit.

The control unit can be configured to monitor from one to eight engines. Detector addresses are identified and associated with the appropriate engine. Deviation levels, average alarm levels and alarm output requirements are all set from the control unit.

The large LCD display shows, on demand, the signal from each detector and indicates the average oil mist level for each engine. In the event of an alarm, the display immediately shows the oil mist signals for the relevant engine. It also enables the individual readings of each detector and the average on an engine to be displayed on demand and automatically under alarm conditions. In the event of a detector fault, that detector can be isolated without affecting the other detectors on the engine. The system will continue to operate while the faulty detector is replaced.

Mk6 Oil Mist Detection System Technical Data

Oil mist detection using well proven sampling method. System is selectable to scan between 1 and 64 detectors. Microprocessor electronics ensures very high degree of active fault indication. Each detector can be individually measured to enable condition monitoring of each crankspace.