introduction to oil discharge monitoring control system
TRANSCRIPT
MarineLogy Marine logics…defined simply
Oil Discharge and Control Monitoring System
Content:
• Introduction of ODMCS• Working line diagram• Source for oily water and contaminants• Requirements for ODMCS• Principle of operation• Entries and Records
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Introduction to ODMCS:
• Oil discharge monitoring and control system is used on board the Oil Tanker ships, having GRT> 150 T, to effectively monitor and control the oily ballast / water from slop tanks or from other tanks which are filled with oil contaminated water from the ship to the sea.
• Slop tanks are filled with cargo tank(s) washing water (oily water) and must be given atleast 24 hrs time to settle, before discharging the content, and the discharge must be monitored by ODMCS.
• The requirements for ODMCS is as per MARPOL 73/78 Annex I, IMO Resolution A.586 (14) and MEPC. 108 (49)
Source for Oily water and contaminants
• Oil contaminated water from cargo tank areas and slop tanks• Oily water from tank washings• Hydraulic oil leaks and spills during filling up• Solvent from paints and parts cleaning• Waste oil from cleaning and other activity, etc
Requirements:
For ODMCS, following requirements must be met:• Arrangement to supply the ship’s speed to control unit• A flow meter for overboard affluent• Arrangement for automatic stopping the overboard discharge when oil content or the rate of discharge
increases the maximum allowed limits as per regulation• Interlocking arrangements where overboard discharge cannot take place unless monitoring and control
system is not in operation• overboard valve control arrangement where the overboard valve is kept closed and the recirculation valve
to slop tank is kept open at all times except when the computer recognizes permissible discharging conditions
Principle of operation:
• The principle of light scattering is used in the measuring cell of the analyzer unit of ODMCS. • This is based on the property that Oil particles emulsified in water scatter the light and the amount of light
scattered is proportional to the number of oil particles and thus to the oil concentration expressed in parts per million (ppm).
•The sample of discharge water passes through the measuring cell tube, in which it is subjected with infrared light path.
•When no oil particles are present in the sample, light passes straight through the cell as a direct beam. •When oil particles are in the sample as a homogeneous mixture, light scatters at different angles
depending on the density of oil droplets and their particle size relative to the wavelength of radiation.
Entries and Records
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 rateAll records of Oil Detection Monitoring Equipment must be stored on board ships for no less than 3 years.
Thank you
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