Who should check and certify accuracy of 15ppm bilge monitor?
The accuracy of 15 ppm bilge alarms is to be checked through the calibration and testing of the equipment, to be conducted by the manufacturer or by persons authorised by the manufacturer.
How do you test a 15ppm alarm?
Check lamps 11, 17, 18 turned off and lamp 13 lighting up. Hold the OIL ALARM switch 33 pressed. OIL ALARM is issued in 2 seconds. OIL ALARM lamp 17 blinks and 15 PPM is displayed.
How many years does the oil content meter and calibration certificate last before it expires?
The validity of this certificate should not be more than 5 years.
What would be the result if the 15 ppm bilge alarm monitor activates during operation of the OWS?
If the oil content is less than 15 ppm, the OCM allows the water to be discharged overboard. If the oil content is higher than 15 ppm, the OCM will activate an alarm and move a three-way valve that, within a short period of time, will recirculate the overboard discharge water to a tank on the OWS suction side.
How often must the accuracy of a 15ppm bilge monitor be checked?
five years
The accuracy of 15 ppm bilge alarms is to be checked by calibration and testing of the equipment conducted by a manufacturer or persons authorized by the manufacturer and should be done at intervals not exceeding five years after its commissioning, or within the term specified in the manufacturer’s instructions.
How do OWS work on ships?
Operating Procedure
- OWS overboard manual discharge valve is to be kept locked and keys are to be kept with the chief engineer.
- Open the desired bilge tank valve from which the oily water mixture is to be discharged from OWS.
- Open air if the control valves are air operated.
How does a oily water separator work?
Oil water separators are designed specifically to target oil based on the gravity difference between oil and water, allowing for heavier solids (sludge) to settle to the bottom while oil rises to the top, leaving additional wastewater in the middle layer.
What ppm of oil in water is allowed in OWS?
15 parts per million
As per maritime regulations, the oil content in the water processed from the OWS must be less than 15 parts per million of oil.
What are the alarms for oily water separator?
A 15ppm Bilge Alarm is normally used in connection to a ship’s oil filtering equipment (also known as “bilge water separator”), monitoring the oil content of the separated/filtered water and stopping the discharge into the sea if the oil content exceeds 15ppm (parts per million).
What principle can be used to detect oil content ppm in an oil content monitor?
light scattering measurement principle
These oil content meters work using a light scattering measurement principle. The sample is passed through an optical cell and the light scatter algorithms will calculate the level of oil content, measured by PPM (parts per million).