Cleaning heat exchanger pipe cluster
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Internal cleaning of the pipe cluster in sea water heat exchangers
Deposits may form on the sea water 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.
D Sea water filter contaminated
D Sea water inlet clogged up
D Flow rate of sea water sufficient
D Impeller of sea water pump worn
If all components of the cooling system are in order, but the coolant temperature remains nevertheless
high, cleaning the pipe cluster may eliminate the fault.
Proceed as follows:
D Lay or stand removed pipe cluster in a suitable container made of synthetic material such as PE, PP,
PVC, GRP etc.
D Fill container with undiluted genuine pickling liquid at room temperature (Lithsolventsäure or engine pick-
ling fluid RB-06) until the pipe cluster is completely submerged
D Allow pickling fluid to soak in for approx. 10 hours. If this period of time is not sufficient, allow another
5 hours
D The pickling period can be shortened by heating up the pickling fluid up to a maximum of 50°C and by
moving the pipe cluster from time to time
D After the pickling the pipe cluster is to be intensively rinsed with tap water and again installed in the heat
exchanger
D Use new seals (O-ring seals) for the caps
D Install pipe set and check heat exchanger 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. The sludge at the bottom must be taken to a special waste dump.
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