Maximum Continuous Rating (MCR)
-The maximum
output that can be produced by an engine continuously without causing failure
to the propulsion machinery.
-It is the
assured continuous power by the engine manufacturer to the ship owner according
to the contract agreed upon.
In real
scenario, this power is never used.
It may be
used only at rare emergencies like:
- Extreme
bad weather condition like a storm is (or is expected) on your course.
-Ship under
pirate attack.
Normal Continuous
Rating (NCR)
-The rating
at which the engine can be operated most efficiently, economically and with
least maintenance.
-typically
85~95% MCR
-this is
usually the contractual output for which the propeller is designed.
Ideal
Firing Speed
-The minimum
speed/rpm required to fire the engine.
-typically
8~12% MCR
Values
for my ship (plz know the values for your ship)
MCR -----> 23000kW @
73.9rpm
NCR------> 20700kW @
71.3rpm
Ideal firing speed
M/E--> 12rpm
A/E--> 200rpm
there are MCR fuel rack and actual fuel rack
ReplyDeletefor every speed, its a limit of fuel rack which is predefined
for avoiding overloading of engine. If engine gets loaded beyond
the MCR fuel rack at that load.
TELL ME ABOUT CRITICAl rpm
ReplyDeleteCritical rpm is a speed range at which resonance occurs. Resonance is a condition where the forced frequency of engine is equal to the natural frequency of hull. Where the amplitude of vibration is very high and more stresses act and chances of failure of machinery parts is high.
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ReplyDeletewhat is the formula in obtaining CSR power of MCR power?
ReplyDeletewhat is the formula in obtaining CSR power of MCR power?
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