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Oil mist detector regulation required for cylinder liner bore 0.3m, power output 2250KW
Oil mist Detector maintenance:
- sampling line to be blown through
- air supply filter to OMD is clean
- air pressure regulator is good working condition
- sensor face to be cleaned
- alarms to be check by injecting smoke
Regulations on Crankcase Relief Valve
- Diesel engines of a cylinder diameter of 200 mm and above or a crankcase gross volume of 0.6 m3 and above are to be provided with crankcase explosion relief valves of a suitable type with sufficient relief area.
- The relief valves are to be arranged or provided with suitable means to ensure that discharge is so directed as to minimize the possibility of injury to personnel.
- The relief valves are to be of the spring-loaded type capable of quickly relieving the over pressure in the event of an internal explosion and closing immediately thereafter to prevent any inrush of air.
- The valve covers are to be of metallic ductile material able to withstand the impact of the stops at the end of the lift.
- The discharge from the valves is to be properly shielded in order to reduce the possible danger from emission of flame.
- In a small engine, cylinder diameter not more than 0.3m, crankcase door may have relief valve
- In a large engine, cylinder diameter more than 0.3m, 1 relief valve placed at each crankcase door.
- Spring retify for opening pressure is 0.07bar at internal pressure and close when relief
OIL MIST DETECTOR
All alarms from oil mist detectors, no matter how suspect the instrument may be, are to be treated as an emergency situation and the engine stopped. Alarms must be reported to the Office immediately. Remember there are no false alarm. Alarm will be activated only if the conducive alarm condition is generated. If the equipment is faulty then failure alarm will be activated. Once Oil mist detector alarm is activated, check the type of alarm being activated. If alarm shows high mist following to be strictly followed:
1. Inform bridge and slowdown ME at earliest opportunity and increase the oil circulation by starting stby LO pump manually. Reset OMD alarm.
2. Inform CE and press Engineer’s Call alarm.
3. Shut down engine as soon the situation permits.
4. Engage ME turning gear, close starting air and open indicator cocks. Turn ME and monitor the bearing temperature from remote. DO NOT STAND NEAR THE Main Engine.
5. ER blowers should be running in supply mode.
6. After 30 minutes check crankcase door temp is not more than 45 degC. Once confirmed, stop LO pump and open the crankcase doors.
7. Ventilate the crank case and carry out physical inspection. Look for hot spots at sliding and rotating parts and squeezed bearing metal. Check bottom of crankcase for metal debris.
8. Start LO pump and look for areas with less flow or abnormally high flow.
9. If no abnormality is found close the crank case door and check the OMD. Clean the sensor and ensure the drain line is clear and drive air is free of moisture.
The Equipment is to be serviced by shore service company/ maker at interval of 36months / drydock.
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