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MAN B&W 9.01
Cylinder Lubricating Oil System
The cost of the cylinder lubricating oil <strong>is</strong> one of the
largest contributions to total operating costs, next
to the fuel oil cost. Another aspect <strong>is</strong> that the lubrication
rate has a great influence on the cylinder
condition, and thus on the overhauling schedules
and maintenance costs.
It <strong>is</strong> therefore of the utmost importance that the
cylinder lubricating oil system as well as its operation
<strong>is</strong> optim<strong>is</strong>ed.
Cylinder oils
Cylinder oils should, preferably, be of the SAE 50
v<strong>is</strong>cosity grade.
Modern high�rated two�stroke engines have a
relatively great demand for detergency in the cylinder
lube oil. Due to the traditional link between
high detergency and high BN in cylinder lube oils,
BN 70 lube oil has previously been used for all fuels
independent of the sulphur level.
Cylinder oil
storage or
service tank
Min. 3,000 mm
Min. 2,000 mm
Level alarm
Filling
pipe
Deck
The letters refer to l<strong>is</strong>t of ‘Counterflanges’
Fig. 9.01.01: Cylinder lubricating oil system
AC
Cylinder oil
storage or
service tank
Heater with set
point of 40 °C
Small box for
heater element
178 52 37�6.1
Company Cylinder oil
SAE 50, BN 60-80
BP Energol CLO 50 M
Energol CL 605
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As the BN (Base Number) gives the level of the
oil’s ability to neutralize the sulphuric acid, operation
on low sulphur fuel as well as LNG and BN
70 cylinder lube oil can give an unwanted amount
of Calcium surplus in the combustion, resulting in
too many deposits.
Therefore low BN 40�50 cylinder lube oils have
been developed and are recommended for use in
ME�GI engines operating continuously on gas and
5�10% pilot oil.
In periods when HDO operation with a high sulphur
fuel oil <strong>is</strong> used as a substitute for LNG, it can
be necessary to change to BN 70, depending on
the time of operation for cylinder feed rate and the
overall engine performance and condition.
The cylinder oils l<strong>is</strong>ted below have all given longterm
sat<strong>is</strong>factory service during heavy fuel operation
in MAN B&W engine installations:
Cylinder oil
SAE 50, BN 40-50
Energol CL 505
Energol CL-DX 405
Castrol Cyltech 70 / 80AW Cyltech 40 SX / 50 S
Chevron *) Taro Special HT 70 Taro Special HT LS 40
ExxonMobil Mobilgard 570 Mobilgard L540
Shell Alexia 50 Alexia LS
Total Talusia Universal
Talusia HR 70
Talusia LS 40
*) Includes Caltex, Chevron and Texaco
Cylinder oil feed rate (dosage)
Adjustment of the cylinder oil dosage to the sulphur
content in the fuel being burnt <strong>is</strong> further explained
in Section 9.02.
MAN B&W ME�GI engines 198 48 88�3.3
MAN Diesel