Operation0750−1/A1
Winterthur Gas & Diesel Ltd.
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3.4 Intermediate BN Lubricating Oils
CAUTION
Damage Hazard: Intermediate BN lubricating oils (between BN 50
and BN 60) are applicable only, if the sulphur content of the used
HFO is in the range of 0.5% m/m to 2.5% m/m. Damage to the
engine can occur.
If an intermediate BN cylinder lubricating oil (where the BN is more than 50 mg KOH/g
and less than 60 mg KOH/g) is used, Wärtsilä Services Switzerland Ltd. recommends
the use of an on-board monitoring programme. That programme gives you an
analysis of the residual BN from the piston underside drain oil.
You can adjust the cylinder lubricating feed rate related to the analysis of the piston
underside drain oil. The permitted maximum feed rate is 1.2 g/kWh.
If the analysis of the piston underside drain oil shows that an adjustment to a higher
feed rate than 1.2 g/kWh is necessary, you must change to a higher BN cylinder
lubricating oil.
4. Turbocharger Oil
To select the turbocharger lubricating oil and keep this oil in a satisfactory condition,
refer to the recommendations given in the turbocharger instruction manual.
The turbocharger lubricating oil is usually system oil or turbine oil.
5. Turning Gear Oil
To select the turning gear oil and keep this oil in a satisfactory condition, refer to the
recommendations given in the instruction manual of the turning gear manufacturer.
6. Lubricants − Flywheel and Pinion Gear Teeth
To select and apply the lubricants, refer to the specification in the Maintenance
Manual 3206-1, and the recommendations from the engine manufacturer.
The lubricant suppliers are given in paragraph 8.4.
7. Environmentally Acceptable Lubricants
Environmentally Acceptable Lubricants (EAL) are currently necessary for ships
operating in USA waters, and this area may be extended in future.
These lubricants, which are required for all oil-to-sea interfaces (and include stern
tubes, thrusters, rudders, stabilizers, variable pitch propellers, underwater ropes,
machinery and underwater transmissions) are made with base oils and additives
which are different to those used for system and cylinder oil.
Thus, EAL must not be mixed into system or cylinder oils where they are to be used in
engine applications. Small quantities of contamination of EAL (related to base oil
quality) in system and cylinder oil can cause elastomer compatibility, water
emulsification and high temperature deposit formation problems.
2016−11
Lubricating Oils
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