6.3.5.4 MDF cooler (1E04)
The fuel viscosity may not drop below the minimum value stated in Technical data. When
operating on MDF, the practical consequence is that the fuel oil inlet temperature must be
kept below 45°C. Very light fuel grades may require even lower temperature.
Sustained operation on MDF usually requires a fuel oil cooler. The cooler is to be installed in
the return line after the engine(s). LT-water is normally used as cooling medium.
If MDF viscosity in day tank drops below stated minimum viscosity limit then it is recommended
to install an MDF cooler into the engine fuel supply line in order to have reliable viscosity
control.
Design data:
4 kW/cyl at full load and 0.5 kW/cyl at idleHeat to be dissipated
80 kPa (0.8 bar)Max. pressure drop, fuel oil
60 kPa (0.6 bar)Max. pressure drop, water
min. 15%Margin (heat rate, fouling)
50/150°CDesign temperature MDF/HFO installa-
tion
6.3.5.5 Black out start
Diesel generators serving as the main source of electrical power must be able to resume their
operation in a black out situation by means of stored energy. Depending on system design
and classification regulations, it may in some cases be permissible to use the emergency
generator. HFO engines without engine driven fuel feed pump can reach sufficient fuel pressure
to enable black out start by means of:
● A gravity tank located min. 15 m above the crankshaft
● A pneumatically driven fuel feed pump (1P11)
● An electrically driven fuel feed pump (1P11) powered by an emergency power source
6-20 DAAB605814
Wärtsilä 46F Product Guide6. Fuel Oil System
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