Changeover of the supplied fuel from DO to HFO procedure when ME is operating

To protect high-pressure fuel equipment from sudden changes in temperature which could damage it, the fuel must be switched manually as follows:

a)    Make sure that the temperature of the HFO fuel in the daily service tank is at normal operating levels.
b)   Reduce engine load to 75% of normal load. The DO fuel must then be heated to a maximum temperature of 50 ° C using a steam system thermostatic valve or a manual viscosity control. This temperature will preserve the lubricating properties of diesel fuel and reduce the risk of high-pressure equipment failure.

NNOTE: the heating of the fuel must be regulated so that the temperature rises by about 2ºC per minute.

c)    The temperature of the fuel in the HFO daily service tank during switching shall not be more than 25ºC above that of the heated diesel fuel system.

NNOTE: the viscosity of diesel fuel must not fall below 2 cSt, as this can cause high-pressure fuel equipment to be struck and fail.

d)   When the diesel fuel is heated to the required temperature, the transition to HFO fuel is performed by opening the fuel oil supply valve from the HFO daily service tank and rotating the fuel supply three-way diverter valve, so that fuel can be pumped out of the HFO daily tank.
e)    Diesel supply valve needs to be closed.

FoForward increase the fuel temperature by approximately 2ºC per minute until the required viscosity is reached.

Changeover of supply fuel from DO to HFO when ME is operating