Oily water separators (OWS), necessary for treating bilge water prior to discharge at sea, enable owners to comply with Marpol guidelines and corresponding Flag State rules. The OWS, officially called a ‘15 ppm bilge separator’ in IMO documentation (IMO Resolution MEPC.107(49), effective from January, 2005, is tied to a ‘15 ppm bilge alarm’ designed to measure the oil content of the discharge mixture and sound an alarm if the effluent exceeds the maximum oil content allow....

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