MAN B&W Alpha Cylinder Lubrication System
The MAN B&W Alpha cylinder lubrication system,
see Figs. 9.02.02a and 9.02.02b, is designed to
supply cylinder oil intermittently, e.g. every four
engine revolutions with electronically controlled
timing and dosage at a defined position.
The cylinder lubricating oil is pumped from the
cylinder oil storage tank to the service tank, the
size of which depends on the owner’s and the
yard’s requirements, it is normally dimensioned
for minimum two days’ cylinder lubricating oil
consumption.
Cylinder lubricating oil is fed to the Alpha cylinder
lubrication system by gravity from the service
tank.
The storage tank and the service tank may alter-
natively be one and the same tank.
The oil fed to the injectors is pressurised by
means of the Alpha Lubricator which is placed
on the HCU and equipped with small multipiston
pumps.
The oil pipes fitted on the engine is shown in Fig.
9.02.04.
The whole system is controlled by the Cylinder
Control Unit (CCU) which controls the injection
frequency on the basis of the enginespeed signal
given by the tacho signal and the fuel index.
Prior to start-up, the cylinders can be prelubric-
ated and, during the runningin period, the opera-
tor can choose to increase the lubricating oil feed
rate to a max. setting of 200%.
The MAN B&W Alpha Cylinder Lubricator is pref-
erably to be controlled in accordance with the Al-
pha ACC (Adaptive Cylinder oil Control) feed rate
system.
The yard supply should be according to the items
shown in Fig. 9.02.02a within the broken line. With
regard to the filter and the small box, plese see
Fig. 9.02.05.
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