Main Engine Shutdowns marine two stroke engines
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Transcript of Main Engine Shutdowns marine two stroke engines
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MAIN ENGINE&AUXILIARY ENGINESHUTDOWNSSLOWDOWNS TRIPSINTERLOCKS
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MAIN ENGINE SAFETY SYSTEMTHE ME SAFETY SYSTEM IS DESIGNED FOR PROTECTING THE DIESEL ENGINE AGAINST BREAKDOWN UNDER CONDITIONS DIFFERENT FROM THOSE OF NORMAL OPERATION.
THE SYSTEM CONSIST OF TWO INDEPENDENT SUB SYSTEMS :
SLOWDOWN SYSTEM - PROVIDES LOAD SHEDDING FOR A TWO-STROKE REVERSIBLE ENGINE WITH OUTPUT TO A FIXED PITCH PROPELLER,BY REDUCING ENGINE RPM.STUTDOWN SYSTEM - STOPS THE ENGINE BY CUTTING-OFF THE FUEL SUPPLY.IT OPERATES AFTER A TIME DELAY OF 10 SECS.
AFTER ACTUATION OF THE SYSTEM THE SAFETY RESET BUTTON MUST BE PRESSED TO UNLOCK.
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MAIN ENGINE SLOWDOWNSTHE ME SLOWDOWN OCCURS UNDER THE FOLLOWING CONDITIONS,
MAIN LO LOW PRESSURE 1.2BAR
CAMSHAFT LO LOW PRESSURE 2BAR
THRUST BEARING HIGH TEMP 75 deg C
PISTON COOLING OIL FLOW 16.9 KG/sec
SCAVENGE AIR HIGH TEMP 75 deg C
MAIN LO HIGH TEMP 70 deg C
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PISTON LO OUTLET HIGH TEMP 85 deg C
MAIN BEARING HIGH TEMP 80 deg C
EXHAUST HIGH TEMP 460 deg C
JACKET COOLING WATER HIGH TEMP 96 deg C
JACKET COOLING WATER LOW PRESSURE 0.5 BAR
PISTON LO PRESSURE LOW 0.5BAR
EXHAUST TEMP DEVIATION 45 deg C
OIL MIST DETECTOR ALARM
THRUST BEARING LOW LO PRESSURE
CONTROL AIR LOW PRESSURE
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MAIN ENGINE SHUTDOWNS
THE ME SHUTDOWN OCCURS UNDER THE FOLLOWING CONDITIONS AFTER A DELAY OF 10 SECONDS,
MAIN LO LOW PRESSURE 1.0BAR
CAMSHAFT LO LOW PRESSURE 1.5 BAR
MAIN ENGINE OVERSPEED
THRUST BEARING HIGH TEMP 85 deg C
T/C LO LOW PRESSURE TRIP
JCW LOW PRESSURE TRIP
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PISTON COOLING WATER LOW PRESSURE TRIP
MAIN BEARING HIGH TEMPERATURE AND PRESSURE TRIP
OIL MIST DETECTOR ALARM
SPRING AIR PRESSURE LOW TRIP
EMERGENCY MANUAL TRIP
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MAIN ENGINE INTERLOCKST/G INTERLOCK
RUNNING DIRECTION (WRONG-WAY) INTERLOCK
AUXILIARY BLOWER INTERLOCK
ME START LOCKING AFTER REVERSE SYSTEM FAILURE
ME START LOCKING AFTER FAILURE OF 3 STARTING ATTEMPTS
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AUXILIARY ENGINE TRIPS
ENGINE SIDE (ENGINE IS STOPPED)
LOW LO PRESSURE TRIP
OVERSPEED TRIP
COOLING WATER HIGH TEMPERATURE TRIP
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GENERATOR SIDE (IT SWITCHES THE GCB OFF)
REVERSE POWER TRIP - > 0.08Prated for 6 sec
UNDER VOLTAGE TRIP - < 320V (0.8Vrated) for more than 3 sec
OVER VOLTAGE TRIP - > 440V (1.1Vrated) for more than 3 sec
OVERCURRENT OR OVERLOAD TRIP (1.21Irated) for 40 sec
SHORT-CIRCUIT TRIP ( I > 3Irated ) for 0.2 sec
LOW FREQUENCY TRIP - < 45 Hz without time delay
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AUXILIARY ENGINE INTERLOCKS
CROW-BAR
LO PRIMING PUMP
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BOILER SHUT DOWNBURNER CUT OUTS LOSS OF PRIMARY/F.D AIR HIGH STEAM PRESSURE FLAME FAILURE L.L WATER LEVEL
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BOILER ALARMSLOW WATER LEVELLOW STEAM PRESSURELOW F.O TEMPERATURELOW ATTOMIZING PRE. FOR BURNERHIGH UPTAKE TEMP