Operation
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The BN 40 products can also be used safely with HFO that has a sulphur content in
the range 0.5% m/m to 1.5% m/m. It is possible that the feed rate must be increased
in relation to the remaining BN measured in the piston underside drain oil or
scrape-down samples.
There are intermediate (between BN 50 and BN 60) and other BN cylinder lubricating
oils available. To use these cylinder lubricating oils, make sure that their performance
is monitored regularly. Also, make sure that the cylinder lubricating oil feed rate is
adjusted to prevent a piston underside BN that is too low. Incorrectly adjusted piston
underside BN can cause high corrosive wear and scuffing (see the limits and
recommendations in paragraph 3.1.
Note: Use only the cylinder lubricating oils given in paragraph 8.2. The oil
company assumes all responsibility for the performance of the cylinder
lubricating oils in service of all Wärtsilä 2-stroke engines to the exclusion
of any liability of any Wärtsilä company belonging to the Wärtsilä group.
The oil company and other possible manufacturers and distributors of
the products in question shall indemnify, compensate and hold free from
liability, Wärtsilä and companies belonging to the Wärtsilä group from
and against any claims, damages and losses caused by the cylinder
lubricating oils in question.
To prevent problems with fuel sulphur content, keep sufficient fuel from the bunker
you took before. This can be used until an analysis of the sulphur content of the new
bunker is received. The results of the bunker analysis and the values given in the
Bunker Delivery Note (BDN) can be different. Always use the higher sulphur content
value to set the feed rate to make sure that the engine operates safely.
3.3 General Recommendations
Service experience has shown that the quantity of corrosion can change very much
while the engine operates at less than 60% CMCR (low load).
If the engine is to be operated at continuous low load (i.e. more than 24 hours of
operation below 60% CMCR) and the sulphur content of the used HFO is more than
2.5% m/m, Wärtsilä Services Switzerland Ltd. recommends the use of a BN 100
cylinder lubricating oil, as the cylinder oil feed rate cannot be adjusted to sufficiently
compensate for the lower alkalinity. If you use a cylinder lubricating oil other than
BN 100, BN 15 and BN 25, the permitted maximum feed rate is 1.2 g/kWh (see
7218−1 Cylinder Lubrication and 7218−3 Feed Rate − Adjustment). 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 (for 25 < BN < 100 lubricating oils), you must change to a
cylinder lubricating oil of BN 100.
For data about applicable cylinder lubricating oils, refer to paragraph 8.2.
Note: You can use the Wärtsilä Blending on Board package to adjust the base
number of the cylinder lubricating oil. For more data, speak to or send a
message to Wärtsilä Services Switzerland Ltd.
It is necessary to monitor the residual BN at regular intervals (see paragraph 3.1 and
paragraph 3.2). Wärtsilä Services Switzerland Ltd recommends an on-board
monitoring programme that, at a minimum, gives you an analysis of the residual BN
from the piston underside drain oil. Wärtsilä Services Switzerland Ltd. also
recommends the analysis of the total iron and chromium content in the piston
underside oil. A sudden increase of the iron or chromium content indicates excessive
cold corrosion. For more data, refer to Technical Bulletin RT-161.
CAUTION
Damage Hazard: The maximum permitted value of the piston
underside drain oil is BN50 (see Fig. 1). If the piston underside
drain oil has a higher BN, damage to the running parts can occur.
This is because of a too high alkalinity of the lubricating oil.
2016−11
Lubricating Oils
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