Operation
0720−1/A1
Winterthur Gas & Diesel Ltd.
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4. Configuration of the Fuel System
In the recommended standard plant, pressure is kept in the full fuel system to prevent
the evaporation of water in the fuel at the temperature necessary for the heavy fuel
oil (HFO). Refer to Fig. 1.
At the applicable position of the three-way valve (10), the low pressure pumps (19)
supply heavy fuel oil from the daily tank (3, 4) to the mixing unit (21). The booster
pumps (22) supplies the fuel from the mixing unit (21) through the end-heaters (23)
and fuel filter (24) to the fuel pumps in the supply unit (28). The rated capacity of the
booster pump (22) is more than that necessary for the engine. The fuel that the
engine does not use flows back to the mixing unit (21). Fuel oil leakage from the
mixing unit (21) flows into the clean fuel oil leakage tank (33) or the fuel oil overflow
tank (33). You can use the clean fuel oil leakage tank (33) to isolate marine diesel
oil (MDO) or marine gas oil (MGO) leakage from HFO leakage.
The pressure regulating valve (17) sets the applicable system pressure. The pressure
retaining valve (27) sets the pressure at the inlet to the fuel pumps (for the adjustment
value, see 0250−1 Operating Data Sheet).
The pump (19) supplies only as much heavy fuel oil from the HFO daily tank (3) as
necessary for the engine. If necessary, the temperature of the heavy fuel oil in the
HFO daily tank (3) must be increased.
Note: The official safety regulations give a maximum temperature limit of the
heavy fuel oil (HFO).
The temperature of the fuel between the mixing unit (21) and the fuel system on the
engine must be increased to the applicable injection temperature. The
end-heater (23) increases the temperature of this fuel. If necessary during the
temperature increase, the heating systems of the mixing unit (21) and the return pipe
can be set to on.
HFO must not go into the marine diesel oil (MDO) daily tank (6).
2015-07
Fuel Treatment and Fuel System
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