1

Oil Discharge Monitoring & Control System Equipment (ODMCS)

• The unit should have a certificate of “type approval” issued by the flag state administration.

• The unit should also have an approved operating manual.

2

ODMCS Category ‘A’

A category ‘A’ monitoring system should be fitted to oil tankers of 4000 dwt & above.

Category ‘A’ systems employ:

• A control unit

• A starting interlock

• Overboard discharge controls

3

ODMCS Data to Control Unit

The control unit receives:

• Oil content of the effluent

• Flow rate of discharge

• Ship’s speed in knots

• Date & time (GMT)

• Status of the overboard discharge control

4

ODMCS Starting Interlock

The starting interlock prevents:

• The initiation of the opening of the discharge valve before the monitoring system is fully operational.

5

ODMCS Overboard Discharge Control

The overboard discharge control initiates:

• The sequence to prevent the discharge in alarm conditions.

6

ODMCS Printer

The control unit must include a digital printer. This must provide:

• Instantaneous rate of discharge.

• Instantaneous oil content (ppm).

• Total quantity of oil discharged.

• Time & date (GMT)

• Ship’s speed.

• Effluent flow rate.

7

ODMCS PrinterFurther information to be recorded on the printer:

• Overboard discharge status.

• Oil type selector setting (where applicable).

• Alarm condition.

• Failure (ie no flow, fault, etc).

• Override action (ie manual override, flushing, calibration etc).

8

ODMCS PrinterData should print out automatically:

• Time discharge is started.

• Time discharge is stopped.

• Record printout intervals not exceeding 10minutes.

• When an alarm condition develops.

• When normal conditions are restored.

9

ODMCS Printer

Data should print out automatically:

• When input data are introduced.

• Whenever the computed rate of discharge varies by 10 litres / nM.

• When zero-setting or calibrating modes are selected.

• On manual command.

10

ODMCS Alarms• Instantaneous rate > 30 litres /

nM.

• Total oil discharged > 1/30,000.

• Power failure.

• Loss of sample.

• Significant failure of the measuring or recording system.

• If the input of any sensor exceeds the effective capacity of the system.