M/E Alarms, safeties, trip

.me alarms and safety trips .me safety

Different Engine Slow Down Situations

In this situation the main engine will come to dead slow RPM i.e. below 30 RPM as the slow down protection gets activated. Following are different slow down situation for main engine:

• Lube oil pressure falls to 1.5 bar
• Cam shaft pressure falls below 2 bar
• Control air pressure is low < 5.5 bar
• There is no flow of piston cooling media (water or oil)
• Oil mist detector or Main bearing sensors has been activated
• Lube oil temperature at the inlet of engine is high > 60 deg C
• Piston Cooling temperature is  high > 75 deg C
• Jacket water Temperature is high > 88 deg c
• Engine cylinder exhaust temperature is high > 450 deg C
• Scavenge air temperature is high > 65 deg C
• Thrust block temperature is high > 75 deg C
• Low flow of Cylinder lube oil

Different Shut down Situations

• Lube oil inlet pressure to engine is very low <1 bar
• Cam shaft Lube oil pressure is very low < 1.5 bar
• Low Jacket cooling water pressure < 0.1 bar
• Lube oil inlet pressure for turbocharger is low < 0.8 bar
• Very high Jacket cooling water temperature >95 deg C
• No flow of Cylinder lube oil
• Thrust block temperature very high > 90 deg C
• Over speed of the engine which activates shut down at 107 % of Max. continuous rating MCR

Different Starting Interlocks are

• Turning gear engage interlock
• Auxiliary blower off interlock
• Lube oil and other important pump not running interlock
• Running Direction Interlock

Safety Devices

1. > Crank case relief door
2. > Scavenge space relief door
3. > Cylinder head relief valve
4. > Starting air relief valve
5. > Starting airline flame trap
6. > Oil mist detector
7. > Rotation direction interlock
8. > Turning gear interlock