Cleaning heat exchanger pipe set
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Internal cleaning of the pipe set in raw water heat exchangers
Deposits may form on the sea–water side of the pipe cluster in the heat exchanger, impairing the heat tran-
sition 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 Raw-water filter contaminated?
D Raw-water inlet clogged up?
D Flow rate of raw water sufficient? Impeller of raw-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 set 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 (engine pickling fluid RB-06)
until the pipe set 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 (120_F)
and by moving the set of pipes from time to time.
D After the pickling the pipe set 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 conditioning
With the aid of soda lye the drained and used cleaning and pickling fluid is conditioned to a pH value of 7.5
to 8.5. After the sediments have settled the clear fluid above can be drained into the sewerage system. The
sludge is to be taken to a dump for special waste.
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