Operation0270−1/A1
Winterthur Gas & Diesel Ltd.
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7. Change-over from MDO to HFO
See 0720−1 Fuel Treatment and Fuel System, Fig. 1.
To change−over from MDO to HFO, do as follows:
1) Make a full time schedule for the change−over to obey the ECA rules.
2) Make sure that you have changed the cylinder lubricating oil to the applicable
BN, refer to paragraph 5.
3) Set to ON the trace heating of the fuel pipes and fuel rail.
4) If the engine room is cold, after a minimum of one hour make sure to get correct
heating.
5) Make sure that HFO cannot flow into the MDO system.
a) 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 HFO leakage
tank.
b) If the fuel return of the pressure control valve goes into the MDO service tank,
set the valve positions to have the fuel return go into the HFO service tank.
6) Close all covers on the rail unit.
7) Decrease the load of the engine to max. 75% 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.
8) Set the viscosimeter to 13 cSt to increase the temperature of the fuel.
The viscosimeter controls the end-heater, which keeps the fuel temperature at the
necessary viscosity.
9) Follow the instructions of the plant to slowly change−over the fuel supply from
MDO to HFO. Make sure that you increase the fuel temperature a maximum of
2_C each minute.
Note: Sudden temperature changes can stop the movement of the fuel pump
plungers.
10) If the temperature changes too much, wait until the fuel temperature is stable.
Then you can continue the procedure.
11) Do a check of the temperature, viscosity and pressure of the supplied fuel.
12) If the temperature, viscosity, or pressure is not correct, find the cause and repair
the fault.
13) Keep the engine in operation 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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