Operation
0270−1/A1
Winterthur Gas & Diesel Ltd.
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6. Change-over from HFO to MDO
See 0720−1 Fuel Treatment and Fuel System, Fig. 1.
To change−over from HFO to MDO, do as follows:
1) Make a full time schedule for the change−over to obey the ECA rules.
2) If you operate the engine with MDO for a long period, you must change the
cylinder lubricating oil to the applicable BN at the related time, refer to paragraph
5.
3) Set to OFF the trace heating of the fuel pipes and fuel rail approximately one
hour before the change−over. The correct time is related to the pipe diameter and
the waste heat in the system.
4) Set the viscosimeter to 17 cSt to decrease the temperature of the fuel.
5) Set to OFF all heating sources in the system (e.g. fuel heaters) some minutes
before the change−over.
6) Decrease the load of the engine to max. 50% CMCR. The decrease of the engine
power is related to the total quantity of fuel that flows in the system, e.g. the
larger the mixing tank, the less decrease in load is necessary.
7) Follow the instructions of the plant to slowly change−over the fuel supply from
HFO to MDO. Make sure that you decrease the fuel temperature a maximum of
2_C each minute.
8) If the temperature changes too much, wait until the fuel temperature is stable.
Then you can continue the procedure. Try to decrease the temperature as
linearly as possible.
9) When the temperature of the fuel is near the applicable value, you can start the
cooler slowly to give a linear and smooth temperature change at minimum
viscosity.
10) Do a check of the temperature, viscosity and pressure of the supplied fuel.
11) If the temperature, viscosity, or pressure is not correct, find the cause and repair
the fault.
12) If you have to collect the MDO from the leakage and return pipes, do as follows:
a) Wait until the system is completely flushed with MDO.
Note: This prevents contamination of the MDO with HFO.
b) If also a MDO leakage tank is installed, move the 3−way valve in the pipe from
the outlet of the fuel leakage fuel pump and injection control to the MDO leakage
tank.
c) If the fuel return of the pressure control valve goes into the HFO service tank, set
the valve positions to have the fuel return go into the MDO service tank.
13) If you have to stop the engine, wait until the change−over procedure is fully
completed.
Note: This prevents problems during the subsequent engine start because of a
mixture of HFO and MDO in the system.
Change-over from Heavy Fuel Oil to Marine Diesel Oil and Back
2017−08
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