Marine Installation Manual
2022-03
4-96
4 Ancillary Systems
4.9 Leakage collection system and washing devices
X62DF-S2.0
4.9.4
The iCER drainage system
During operation of the iCER system, water condensation is generated by the
cooling of the exhaust gas in the iCER system. This specifically occurs during gas
mode operation and under most conditions of diesel Tier III mode operation.
This water is used in the EGC (see section
) and collected in the
EGC circulation water tank which must be sized accordingly.
If the tank filling level value provided by the level transmitter exceeds the max
-
imum value as defined in the software, then the EGC circulation water pump
will pump out water from the EGC circulation water tank until a specific level
has been reached. If required, the water removal can also be manually activated
due to water contamination or other reasons. For safety purposes, in case the au
-
tomatic drainage system fails, a high-level switch is installed in the EGC drain
tank to initiate a shutdown of the iCER operation. The engine then trips to oper
-
).
The oil-in-water (o/w) content is continuously monitored when the EGC circu
-
lation water is drained from the EGC circulation water tank. When the vessel is
operating under conditions which allow overboard discharge and the oil-in-water
content is below 15 ppm, then a switching valve directs bleed-off water over
-
board. Otherwise the bleed-off water is stored in the EGC drain tank. When the
vessel is operating in special areas or under conditions which do not allow any
overboard discharge, the switching valve must be manually locked to direct the
bleed-off water to the EGC drain tank.
Arrangement of the iCER drainage system for installations which exclusively run
in gas mode
For iCER installations which run exclusively in gas mode, the iCER system does
not include any water treatment process for the EGC circulation water. Instead,
water treatment is provided for the bleed-off water and the SAC drain water
(during iCER operation).
The bleed-off water and the SAC drain water (during iCER operation) are di
-
rected through a pH-neutralisation dosing unit before entering the EGC drain
tank. This ensures that the water in the EGC drain tank maintains a proper pH
value (e.g. above pH 6).
If the oil-in-water content in the EGC drain tank exceeds 15 ppm, oil removal by
means of a water treatment unit is required. Otherwise, if the oil-in-water content
in the EGC drain tank does not exceed 15 ppm and the vessel is operating out
-
side an area of restricted overboard discharge, the water can then be directly
pumped overboard. Depending on the type of water treatment unit, coagulant
dosing may be required.
provides a sketch of the iCER
drainage system for installation with only gas mode operation. For details, please
refer to the supplier of the water treatment unit.
