A 15 ppm bilge alarm, also called an oil content meter, monitors the oil content of treated bilge water and stops the overboard discharge when it exceeds the limit. It is the last safeguard between the bilge and the sea, and it is checked at every inspection.
10 models from 5 manufacturers. Below: the manufacturers at a glance and the full model list.
Oily water from the engine room bilges is cleaned in an oily water separator before it may be discharged overboard. The separator does the cleaning, but the oil content meter does the checking: it measures the oil concentration in the outgoing water, and when the reading goes above 15 parts per million it raises an alarm and triggers an automatic stop of the discharge, normally by switching a three-way valve so that the water returns to the bilge tank. The device also records its readings, discharge times and alarms, which makes it a key source of evidence for the oil record book. For that reason it is among the first items an inspector looks at after a pollution case.
MARPOL Annex I requires oil filtering equipment for the machinery space bilges, and a 15 ppm alarm and automatic stopping device that fit it. The technical specifications are set in the IMO guidelines for pollution prevention equipment for machinery space bilges, and the equipment must be tested and certified according to those guidelines. The alarm must be in service whenever the separator is used, and the discharge is only allowed through it. Records from the alarm and the oil record book are inspected during port state control.
Test the alarm and the automatic stop together on a regular basis, and note the result in the log. An alarm that has never been seen to switch the valve is a risk to the ship in an inspection.
All 5 manufacturers with models of 15 ppm Bilge Alarm (Oil Content Meter). Names with a manufacturer page open it; the others open a search across the full library.
All manufacturersThe best-documented model of each manufacturer first, then the next — 10 of 10 models in 15 ppm Bilge Alarm (Oil Content Meter). Every row links to full specifications, documents and service notes.
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