The Oily Water Separator (OWS) is one of the most critical systems in the engine room of a cargo ship.
From my experience as a marine engineer, I can say that this system is directly linked to environmental compliance and legal operation of the vessel.
MARPOL regulations
According to the International Maritime Organization and MARPOL Convention:
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Discharged water must contain less than 15 ppm oil
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A monitoring system must be installed
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All operations must be recorded
How OWS works
The system separates oil from bilge water using gravity and filtration.
Steps include:
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Bilge water enters
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Initial separation
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Coalescing filters
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15 ppm monitoring
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Discharge or recirculation
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Daily operation
During operation, I always check:
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system pressure
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valve positions
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alarm status
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discharge line
The 15 ppm monitor is the most critical part.
Maintenance
Routine maintenance includes:
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cleaning filters
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checking sensors
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testing alarms
Proper record keeping is also essential.
Importance on board
From my experience, improper use of OWS can lead to serious legal consequences.
That is why marine engineers treat this system with maximum attention.
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