Operation
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Winterthur Gas & Diesel Ltd.
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Fig 1. shows the relation between the residual BN and the total iron content of the PU
drain oil. This data is only applicable when fuel with a sulphur content between
0.5% m/m and 3.5% m/m and cylinder lubricating oil with a BN between 40 and 100 is
used. For data about cylinder lubricating oils with a base number less than 40, refer to
0750−1 Lubricating Oils.
Fig. 1: PU Drain Oil − Relation between Residual BN and Total Iron
The empirical data can be used for future operation with the same cylinder lubricating
oil and fuel with the same sulphur content (±0.125 %m/m). When you use your
empirical data, Wärtsilä Services Switzerland Ltd recommends that you do a PU oil
sample. This makes sure that the used feed rate is applicable. For more data, refer to
Service Bulletin RT-161 Issue 2 Cylinder Lubrication.
2015-12
Feed Rate − Adjustment
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