Oil discharge monitoring equipment (ODME) is based on a measurement of oil content in the ballast and slop water, to measure conformance with regulations. The apparatus is equipped with a GPS, data recording functionality, an
oil content meter and a flow meter.
By use of data interpretation, a computing unit will be able to allow the discharge to continue or it will stop it using a valve outside the deck.
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Operating principle
A sample point on the discharge line allows for the analyzer to determine the oil content of the ballast now and slop water in PPM.
The analyzer is self-maintaining by periodical cleansings with
fresh water
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salt (chemistry), salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include ...
, and therefore requires a minimum of active maintenance from the crew.
The results of the analyzer are sent to a computer, which determines whether the oil content values are to result in overboard discharge or not.
The valves that direct the ballast water either over board or to slop tank are controlled by the integrated computer, and a GPS signal further automates the process by including special areas and completes the required input for the
Oil Record Book
All cargo vessels where MARPOL Convention is applicable must have an oil record book in which the officer responsible will record all oil or sludge transfers and discharges within the vessel. This is necessary for authorities to be able to monit ...
.
All oil tankers with a gross tonnage of larger than 150 must have efficient Oil Discharge Monitoring Equipment on board.
The oily discharge is sent out to sea through a pump. The oily mixture has to pass through a series of sensors to determine whether it is acceptable to be sent to the discharge pipe.
Based on regulations, the following values must be recorded by the system:
* Date and time of the discharge
* Location of the ship
* Oil content of the discharge in ppm
* Total quantity discharged
* Discharge rate
All records of Oil Detection Monitoring Equipment must be stored on board ships for no less than 3 years.
Oil Discharge Monitoring systems today consist of a computing unit that is installed in the cargo control room. The computer unit control and receives data from other ODME components.
[{{Cite web, title = ODME 2005 - Oil Discharge Monitor {{! Monitoring and control systems {{! Products {{! JOWA AB, url = http://www.jowa.se/page/products/monitoring-and-control-systems/odme-2005---oil-discharge-monitor, website = www.jowa.se, accessdate = 2015-07-23, first = Merreklam, last = www.merreklam.se]
ODME systems also have an analyzing unit that contains the
Oil content meter, a fresh water valve for cleaning purposes, and a pressure transmitter that monitors the sample flow through the measuring cell.
See also
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Marpol 73/78
The International Convention for the Prevention of Pollution from Ships, 1973 as modified by the Protocol of 1978, or "MARPOL 73/78" (short for "marine pollution") is one of the most important international marine environmental conventions. It ...
*
Marpol Annex I
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Oily water separators
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Oily water separator (marine)
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Oil Content Meter
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Magic Pipe
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IMO
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Port Reception Facilities
Port reception facilities are a place that international shipping ports must provide to collect residues, oily mixtures, and garbage generated from an ocean-going vessel. contaminants generated by ships cannot be discharged directly to the ocean. A ...
References
Waste treatment technology
Ocean pollution