7.5 Flushing instructions
Flushing instructions in this Product Guide are for guidance only. For contracted projects,
read the specific instructions included in the installation planning instructions (IPI). The fineness
of the flushing filter and further instructions are found from installation planning instructions
(IPI).
7.5.1 Piping and equipment built on the engine
Flushing of the piping and equipment built on the engine is not required and flushing oil shall
not be pumped through the engine oil system (which is flushed and clean from the factory).
It is however acceptable to circulate the flushing oil via the engine sump if this is advantageous.
Cleanliness of the oil sump shall be verified after completed flushing.
7.5.2 External oil system
Refer to the system diagram(s) in section External lubricating oil system for location/description
of the components mentioned below.
7.5.3 Type of flushing oil
7.5.3.1 Viscosity
In order for the flushing oil to be able to remove dirt and transport it with the flow, ideal viscosity
is 10...50 cSt. The correct viscosity can be achieved by heating engine oil to about 65°C or
by using a separate flushing oil which has an ideal viscosity in ambient temperature.
7.5.3.2 Flushing with engine oil
The ideal is to use engine oil for flushing. This requires however that the separator unit is in
operation to heat the oil. Engine oil used for flushing can be reused as engine oil provided that
no debris or other contamination is present in the oil at the end of flushing.
7.5.3.3 Flushing with low viscosity flushing oil
If no separator heating is available during the flushing procedure it is possible to use a low
viscosity flushing oil instead of engine oil. In such a case the low viscosity flushing oil must
be disposed of after completed flushing. Great care must be taken to drain all flushing oil from
pockets and bottom of tanks so that flushing oil remaining in the system will not compromise
the viscosity of the actual engine oil.
7.5.3.4 Lubricating oil sample
To verify the cleanliness a LO sample shall be taken by the shipyard after the flushing is
completed. The properties to be analyzed are Viscosity, BN, AN, Insolubles, Fe and Particle
Count.
Commissioning procedures shall in the meantime be continued without interruption unless
the commissioning engineer believes the oil is contaminated.
DBAD209883 7-21
7. Lubricating Oil SystemWärtsilä 46DF Product Guide
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