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DPS 2100 Engine Safety System User Manual Doc. No. 921.450.021Descripción completa
Engine Safety CAT C7 C9
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Engine Safety Safet y devices d evices The main engine safety devices are provided in the system to safe guard 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 safe guarding 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 well 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
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The Starting ir relief valve . Cylinder head Relief valve
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!lame trap.
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"il mist detector.
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Running Direction #nterlock
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Turning gear #nterlock.
•
Main Engine Slo Don 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 T!i"s : 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 T#I$S A#E: $. "ver Speed Trip %. &ow &ube oil pressure Trip '. Cam shaft &ube oil low pressure Trip Trip (. )acket cooling water low pressure Trip *. +iston cooling water low pressure Trip ,. Thrust -earing igh pressure Trip
/. Main -earing high pressure and temperature Trip. 0. "il Mist Detector
1.Explosion relief valve The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high-pressure air in a combustion chamber. In common with all internal combustion engines the diesel engine operates with a fixed sequence of events, which may be achieved either in four strokes or two, a stroke being the travel of the piston between its extreme points. ach stroke is accomplished in half a revolution of the crankshaft. !s a practical safeguard against explosions which occur in a crankcase, explosion relief valves or doors are fitted. These valves serve to relieve excessive crankcase pressures and stop flames being emitted from the crankcase. They must also be self closing to stop the return of atmospheric air to the crankcase. "arious designs and arrangements of these valves exist where, on large slo w-speed diesels, two door type valves may be fitted to each crankcase or, on a mediumspeed diesel, one valve may be used. #ne design of explosion relief valve is shown in $igure. ! light spring holds the valve closed against its seat and a seal ring completes the joint.
! deflector is fitted on the outside of the engine to safeguard personnel from the out flowing gases, and inside the engine, over the valve opening, an oil wetted gau%e acts as a flame trap to stop any flames leaving the crankcase. !fter operation the valve will close automatically under the action of the spring.
2. The cylinder relief valve: The cylinder relief valve is designed to relieve pressures in excess of &'( to )'( above normal. ! spring holds the valve closed and its lifting pressure is set by an appropriate thickness of packing piece . #nly a small amount of lift is permitted and the escaping gases are directed to a safe outlet. The valve and spindle are separate to enable the valve to correctly seat itself after opening. The operation of this device indicates a fault in the engine which should be discovered and corrected. The valve itself should then be examined at the earliest opportunity.
3. Relief Valve
Its purpose is to relieve excess pressure in the air start manifold. It consists of a spring loaded valve disk which locates on a mating seat which is bolted to the end of the air start manifold. When the force exerted on the disk due to excessive pressure is greater than the spring force holding the valve closed, the valve will open and release the excessive pressure. 4. Flame Arrestors
The ame trap is manufactured from brass or aluminium alloy which both have a high specic heat capacity. number of holes are bored through the thick circular form to allow the air to pass through. They are tted in the main air line immediately before the air start valve to restrict the risk of a ame in the cylinder propagating back to the main air start manifold, by dissipating the heat energy in the ame.
6.OIL MIST DETECTOR The presence of an oil mist in the crankcase is the result of oil vapori%ation caused by a hot spot. xplosive conditions can result if a buildup of oil mist is allowed. The oil mist detector uses photoelectric cells to measure small increases in oil mist density. ! motor driven fan continuously draws samples of crankcase oil mist through a measuring tube. !n increased meter reading and alarm will result if any crankcase sample contains excessive mist when compared to either clean air or the other crankcase compartments. The rotary valve which draws the sample then stops to indicate the suspect crankcase. The comparator model tests one crankcase mist sample against all the others and once a cycle against clean air. The level model tests each crankcase in
turn against a reference tube sealed with clean air. The comparator model is used for crosshead type engines and the level model for trunk piston engines.
7. The Turning gear interloc!
The turning gear interlock is a valve which will not allow starting air to operate the system when the turning gear is engaged.
". . Running #irction interloc
Running direction interlock prevents engine to be started in reverse direction until all cam rollers of fuel pump have shifted. Telegraph position interlock allows engine to be started only in the direction intended by bridge. Distributor position interlock.checks whether distributor is whether in start or stop direction. It has to be in either in one direction to commence starting.