9.2 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 9-1 Example diagram for single main engine (DAAF301503A)
System components:
Air venting4S01Stand-by pump (HT)4P03Heat recovery (evaporator)4E03
Drain tank4T04Circulating pump (preheater)4P04Heater (preheating unit)4E05
Expansion tank4T05Stand-by pump (LT)4P05Central cooler4E08
Temp. control valve (heat recovery)4V02Transfer pump4P09Suction strainer (sea water)4F01
Temp. control valve (central cooler)4V08Circulating pump (sea water)4P11Preheating unit4N01
Temp. control valve (charge air)4V09Circulating pump (evaporator)4P19Evaporator unit4N02
16V12V - 14V8V - 10VPipe connections:
DN150DN125DN100HT-water inlet401
9-2 DBAE248994
Wärtsilä 31DF Product Guide9. Cooling Water System
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