VAF instruments OILCON MARK 6M, Technical Manual

Page: 68 / 175

67

Increase the speed of the cargo pump. Watch the discharge rate on the MCU, it will increase
as the speed of the cargo pump is increased.
NOTE:
If the discharge rate approaches the maximum permissible (i.e. 30 l/NM), it can be
reduced by slowing down the cargo pump.
The system is now operating fully automatically. If any of the permitted limits are exceeded
or if any other alarm is activated, an alarm will be given, the overboard valve will be closed
and the ballast will be diverted to the slop tank.
When the system is running normally, the oil content will be displayed. At regular intervals a
record of the monitor status is logged, which will build up to give a complete record of the
ballast discharge. Whenever there is a discharge overboard the total oil discharged will be
incremented.
Every 3 minutes the window wash will operate automatically. This is indicated in the display
by windows wash. During the operation extra manual window flushing can be carried out, if
required by pressing the W WASH key.
If it is suspected that the detector cell is particularly dirty, extra cleaning can be carried out
by pressing the FLUSH key. It should be noted however, that this will cause the discharge
overboard to be stopped automatically. The monitor will not be measuring the discharge
overboard whilst flushing.
7.3.2 Shutdown of discharging operations
To stop operation the following steps should be performed:

Stop cargo pumps

Press the STOP key
o
The display changes from sample mode to idle mode.\
o
The overboard valve command changes from “COM: O” to “COM: C”.
o
The sample pump stops.

Press the STOP key again.
o
The shutdown mode is started. This is an automatic flush sequence to clear the
pipework of oil contaminated water, leaving the monitor clean for the next time it is
used.
o
The display will indicate shutdown.
o
The valve V10 opens to select clean water.
o
The valve V11 closes.
o
The selected sample valve opens.
o
The sample pump starts.
o
After 2 minutes of back flush the system changes to the forward flush mode
o
Display indicates “Shutdown mode”
o
The valve V11 opens.
o
The window wash pump V12 operates for 12 seconds.
o
After 2 minutes of forward flush the system changes to standby mode.
The display indicates standby
o
All valves are closed.
o
The sample pump is stopped.

Switch the MCU to “OFF”.
The system is now shut off. All manual valves in the system may be closed and all auxiliaries
may be shut off. The only active electronics will be the clock/calendar and the overboard
valve position control. If for any reasons there is a change in the overboard valve position
from CLOSE to OPEN or vice versa, a record is made of the event.