84
OXE 150/200 HP SERVICE MANUAL
CLEANING THE HEAT EXCHANGER
Cleaning seawater heat exchanger
Deposits may form on the seawater side of the pipe cluster in the heat exchanger,
impairing the heat transition to such an extent that the coolant heat can no longer
be sufficiently conducted away. This is bound to cause an increase in the coolant
temperature.
In the event of an increase in coolant temperature, check all other components of
the cooling system first.
-
Seawater filter contaminated.
-
Seawater inlet blocked.
-
Insufficient seawater flow rate.
-
Worn or damaged seawater pump/impeller.
If all components of the cooling system are in order, but the coolant temperature
remains high, cleaning the heat exchanger may eliminate the fault.
Proceed as follows:
1.
Place removed heat exchanger in a suitable container made of synthetic
material.
2.
Fill container with undiluted genuine pickling liquid at room temperature until
the heat exchanger is completely submerged.
3.
Allow pickling fluid to soak in for approx. 10 hours. If this period of time is not
sufficient, allow another 5 hours.
4.
The pickling period can be shortened by heating up the pickling fluid up to a
maximum of 50°C and by moving heat exchanger from time to time.
5.
After the pickling the heat exchanger is to be intensively rinsed with tap water.
6.
Install heat exchanger to engine and check for leaks.
Waste water treatment
Drained and spent cleaning and pickling fluid should be brought up to a pH value
of 7.5 to 8.5 with the aid of caustic soda. Once the precipitation has settled to the
bottom of the container, the clear fluid above can be tipped into the sewer system.
!
CAUTION
Risk of contamination of drinking water. Dispose of the sludge at the bottom
according to local environmental legislation.
HEAT EXCHANGER REPLACEMENT
Содержание 30-0100-125
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