69
7.5 OPERATIONAL ALARMS
NOTE:
At all times the Oilcon
®
Oil Discharge Monitoring and Control System must be operated
as directed by MARPOL 73/78 to prevent discharge of oil contaminated water
overboard.
There are necessarily a number of alarm conditions in the MCU. Irrespective of what caused the
alarm, the result is the same. An alarm message will appear on the display alongside whatever
caused the alarm. Also the internal buzzer will sound. A control signal will be sent to stop the ballast
water discharge.
Should any alarm occur during normal operation, the alarm menu is displayed in the screen.
Press the ACK key to will silence the audible alarm and leave the alarm menu.
However the fault must be cleared before any discharge of ballast can take place.
Figure 61
The following alarms can occur:
Alarm Description
No air
If for any reason there is no air supply to the Oilcon
Oil Discharge
Monitoring and Control System, in “Control” mode, a mismatch is detected between the overboard valve
command and the overboard valve position indication.
Discharge ratio
If during operation of the Oilcon
Oil Discharge Monitoring and Control System the rate of discharge exceeds 30
l/NM the DISCHARGE RATIO alarm is activated.
The system will continue operation in the Sample mode, although the ballast water discharge will be stopped.
According to the Regulations the maximum discharge rate is 30 litres/nautical mile and the discharge rate alarm
level is set to this limit, but may be set to a lower figure, if required. This can be done with the setup menu.
Total discharged
oil limit
If the total discharge oil limit exceeds 1/30,000 of the last cargo carried, the TOTAL DISCHARGED
OIL LIMIT alarm is activated.
The limit is normally set by the operator and is calculated as:
- 1/30,000 of the last cargo carried (for new ships) or
- 1/15,000 of the last cargo (for existing ships).
The result, in litres, is entered in the setup menu.
If this limit is exceeded, no further discharge of ballast water can take place on that particular
voyage.
The TOTAL OIL DISCHARGED can only be reset at the start of a new ballast voyage. (i.e. after a
cargo has been carried and the vessel is again ballasted). A record is logged when the total oil limit
is reset.
Bad shut-down
If during the previous usage of the system the unit was shut-down in an incorrect manner,
(i.e. without going through shutdown flush sequence) then this message will appear briefly on the
display at the next start up. The event will be logged within the systems own internal memory.
CONTROL Sample point: 1 22-11-11
alarm Oil type: 5 10:38
ALAR M
EPU No communication
EPU: no communication
free: 1927296 kB
ACK
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