PROCEDURE
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 oil
to the applicable BN at the related time, refer to section 8.10 Change-over the diesel
fuel - general.
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 (for example 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 (for example 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.
NOTE: The viscosity of the fuel must not be less than 2 cSt.
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:
12.1 Wait until the system is completely flushed with MDO.
NOTE: This prevents contamination of the MDO with HFO.
12.2 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.
12.3 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.
CLOSE UP
• None
X92DF
AA00-0000-00AAA-131D-A
Operation Manual Change-over from HFO to MDO manually
Winterthur Gas & Diesel Ltd.
- 465 - Issue 002 2020-08
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