WinGD X72 - Fuel Sulphur Content and Cylinder Lubricating Oil Base Number

Operation
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Winterthur Gas & Diesel Ltd.
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3.2 Fuel Sulphur Content and Cylinder Lubricating Oil Base Number
Fig. 2 shows recommendations of applicable cylinder lubricating oils related to the
sulphur content of the used fuel. Also shown is the data for fuel with a sulphur content
in the range of 1.5% m/m to 3.5% m/m and cylinder lubricating oil with a base number
between BN 50 to BN 100.
If you do not use an on-board monitoring programme to monitor the piston underside
drain oil, use the data given in Fig. 2 to choose an applicable cylinder lubricating oil.
For data about the applicable feed rates, see 7218−1 Cylinder Lubrication and
7218−3 Feed Rate − Adjustment.
5
4
3
2
1
WCH03461
Fig. 2: Relation between Fuel Sulphur Content and Cylinder Lubricating Oil BN
D Range 1 (see Fig. 2): When the fuel sulphur content is more than 0.1% m/m and
less than 0.5% m/m during operation with BN 15 to BN 25 cylinder lubricating oil,
you must do an analysis of the piston underside drain oil from the on-board
monitoring system. You must obey the data that follows:
D The residual base number must not be less than BN10.
D The iron (Fe) content must be less than 500 ppm.
D Do regular checks of the piston and piston ring conditions through scavenge
port inspections. If necessary, increase the cylinder lubrication oil feed rate
to more than 1.2 g/kWh (see 7218−1 Cylinder Lubrication and 7218−3 Feed
Rate − Adjustment).
D Range 2 (see Fig. 2): When the fuel sulphur content is more than 0.1% m/m and
less than 0.5% m/m during operation with BN 40 cylinder lubricating oil, operation
is permitted only, when you do an analysis of the piston underside drain oil from
the on-board monitoring system. You must obey the data that follows:
D Do regular checks of the piston and piston ring conditions through scavenge
port inspections.
D Do regular checks of the cylinder liner condition.
D You must obey the data given in Fig. 1.
2016−11
Lubricating Oils