The main engine safety devices are provided in the system to safeguard the main engine in case of any damage in the system Mainly are fitted in engine when all the alarm and trips fails to work then the last means for safeguarding the engine and components is these safety devices fitted in the main engine .These are mainly of the type of pressure relief valve which release the excess pressure built in case of malfunctioning of the engine and no action is will in advance to rectify or to avoid the situation
SOME OF THE MAIN ENGINE SAFETY DEVICES FITTED IN THE MAIN ENGINE :
● Crank case Relief Door
● Scavenge Space Relief Door
● The Starting Air LIne Relief valve .
● Cylinder head Relief valve
● Flame trap.
● Oil mist detector.
● Running Direction Interlock
● Turning gear Interlock.
Main Engine Slow Down
Main engine slow down automatically when there is problem in the system and to avoid the greater damage in the later stages when these defects are rectified the engine automatically tunes to the sea speed .This is the primary stage to rectify the defects and it also indicates there is a great damage to be taken place so rectify the defects as early as possible .
Main Engine Safety Trips :
Main engine safety trip which trips the main engine when no corrective action is taken to the alarm and in certain cases the main engine is tripped manual .
Manual tripping of main engine is done in chance of the collision or grounding of the ship when sailing in congested water and in navigation of the ship in restricted visibility .
So when any main engine trips are activated the Main engine stops and again it should be started with the help of starting air after correcting the faults .
SOME OF THE MAIN ENGINE TRIPS ARE :
1. Over Speed Trip
2. Low Lube oil pressure Trip
3. Camshaft Lube oil low pressure Trip
4. Jacket cooling water low pressure Trip
5. Piston cooling water low pressure Trip
6. Thrust Bearing High pressure Trip
7. Main Bearing high pressure and temperature Trip.
8. Oil Mist Detector
9. Spring air pressure Low Trip
10. Emergency Manual Trip.
