9.3 External cooling water system
It is recommended to divide the engines into several circuits in multi-engine installations. One
reason is of course redundancy, but it is also easier to tune the individual flows in a smaller
system. Malfunction due to entrained gases, or loss of cooling water in case of large leaks
can also be limited. In some installations it can be desirable to separate the HT circuit from
the LT circuit with a heat exchanger.
The external system shall be designed so that flows, pressures and temperatures are close
to the nominal values in Technical data and the cooling water is properly de-aerated.
Pipes with galvanized inner surfaces are not allowed in the fresh water cooling system. Some
cooling water additives react with zinc, forming harmful sludge. Zinc also becomes nobler
than iron at elevated temperatures, which causes severe corrosion of engine components.
Fig 9-5 Cooling water system, single main engine combined LT/HT (DAAF418507)
System components:
Air venting4S01Heater (preheater)4E05
Additive dosing tank4T03Central cooler4E08
Drain tank4T04Cooler (Installation parts)4E12
Expansion tank4T05Preheating unit4N01
Temperature control valve (HT)4V01Evaporator unit4N02
Temp control valve (heat recovery)4V02Stand-by pump (LT)4P03
Temp control valve (central cooler)4V08Circulating pump (preheater)4P04
Temperature control valv (charge air)4V09Stand-by pump (LT)4P05
Transfer pump4P09
DBAD209883 9-7
9. Cooling Water SystemWärtsilä 46DF Product Guide
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