how marine propulsion engine of the ship is protected

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How Marine Propulsion Engine of theShip is Protected?NOVEMBER 9, 2011 BY MOHIT — 2 COMMENTS

A ship’s propulsion engine is what keeps the ship going at sea. Considered as the heart of

any vessel, the marine engine of the ship takes the entire load to propel the ship forward. Of

course, without an engine a ship is almost a “dead ship.”

Throughout its life, the propulsion engine of the ship goes through various loads and

stresses from rough weather to harsh manoeuvring and breakdowns.

To avoid any major loss or damage to the marine engine, several protective devices are tted

to safeguard the engine from major damages and breakdown.

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Dierent Types of Protections on a Ship’s Marine Engine

Basically there are four main types of protection systems used to safeguard propulsion

engine:

1. Alarm: In case of deviation of engine parameters from a set value, an audible and visual

alarm will sound which will give an early warning of the problem.

http://www.marineinsight.com/misc/marine-safety/different-types-of-alarms-on-ship/


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2. Slow down: It is the next stage of protection when actions taken are not sucient to

control the ongoing problem; hence engine slow down is done to counter the disturbed

parameter.

3. Shut down: When there is a higher uctuation in the engine parameters which can harm

other systems of the engine, the shut down protective devices cut o the fuel supply and the

engine stops.

4. Starting Interlock: This will not allow the engine to start from the stand-still condition if

some important system within the engine has not been operated or arranged properly.

Dierent 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 dierent slow down situation for main engine:

Lube oil pressure falls to 1.5 bar

Cam shaft pressure falls below 2 bar

There is no ow 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 ow of Cylinder lube oil

Control air pressure is low < 5.5 bar

Dierent Shut down Situations:

Lube oil inlet pressure to engine is very low


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10 Safety Points forRemote Manoeuvring

System of Marine

Engine

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Cam shaft Lube oil pressure is very low < 1.5 bar

Very high Jacket cooling water temperature >95 deg C

Low Jacket cooling water pressure < 0.1 bar

No ow of Cylinder lube oil

Thrust block temperature very high > 90 deg C

Lube oil inlet pressure for turbocharger is low < 0.8 bar

Over speed of the engine which activates shut down at 107 % of Max. continuous

rating MCR

Dierent Starting Interlocks are:

Turning gear engage interlock

Auxiliary blower o interlock

Lube oil and other important pump not running interlock

Apart from safety protections on a ship’s engine, various other systems to ensure that various

other operations are not aected.

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About Mohit

Mohit Kaushik is a marine engineer sailing with Maersk Shipping. He handles website

development and technical support at Marine Insight. Apart from handling web

development projects, he also manages a logistics company and have a keen interest in modern

logistic technologies .

Comments

jerry says

NOVEMBER 10, 2011 AT 1:39 PM

great!

some engine scavenge pressue and governor interlock.

Angel saysOCTOBER 22, 2015 AT 12:23 AM

Dear Mohit,

Could you describe some ways to activate these alarms by simulating the situations which

trigger above described slow down or shutdown of the ME?

Thanks!

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