Man B&W Alpha Cylinder Lubrication System; System Control Units - Man B&W L35MC6-TII Project Manual

MAN B&W
MAN B&W Alpha Cylinder Lubrication System
The MAN B&W Alpha cylinder lubrication system,
see Figs. 9.02.02 and 9.02.03, is designed to sup-
ply cylinder oil intermittently, every 2 to 20 engine
revolutions with electronically controlled timing
and dosage at a defined position.
Cylinder lubricating oil is fed to the engine by
means of a pump station which as standard is
mounted on the engine, EoD: 4 42 150, or could
be placed in the engine room, option: 4 42 152.
The pump station has two pumps (one operating,
the other stand-by with automatic start up) with
in-line filters and a heater, see Fig. 9.02.02.
The oil fed to the injectors is pressurised by
means of one or two Alpha Lubricators placed
on each cylinder and equipped with small
multipiston pumps, see Fig. 9.02.03.
Accumulator tanks on the lubricator inlet pipes
ensure adequate filling of the lubricator while ac-
cumulators on the outlet pipes serve to dampen
the pressure fluctuations. The oil pipes fitted on
the engine is shown in Fig. 9.02.03.
On engines with double lubricators, a by-pass
valve allows for circulating and heating the cyl-
inder oil before starting the engine under cold
engine room conditions. On engines with one lu-
bricator per cylinder, this is done by means of the
valve on the cylinderblock intended for emptying
the accumulator.
Prior to start-up, the cylinders can be pre-lubricat-
ed and, during the runningin period, the operator
can choose to increase the lubricating oil feed
rate to a max. setting of 200%.
MAN B&W K98MC6/7, K98MCC6/7, S90MC-C7/8, K90MC-C6,
S80MC6, S80MC-C7/8, K80MC-C6, S70MC6, S/L70MC-C7/8,
S60MC6, S/L60MC-C7/8, S50MC6, S50MC-C7/8, S46MC-C7/8,
S42MC7, S40MC-C9, S35MC-C9, L35MC6, S26MC6

System control units

The cylinder lubrication system is controlled by
the Master Control Unit (MCU) which calculates
the injection frequency on the basis of the engine-
speed signal given by the tacho signal (ZE) and
the fuel index.
Lubricating control functions such as 'mep de-
pendent' and 'load change dependent' are all
incorporated in the MAN B&W Alpha cylinder lu-
brication system.
The MAN B&W Alpha Cylinder Lubricator is pre-
ferably to be controlled in accordance with the
Alpha Adaptive Cylinder oil Control (Alpha ACC)
feed rate system. The Alpha ACC is explained in
the following page.
The MCU is equipped with a Backup Control Unit
(BCU) which, if the MCU malfunctions, activates
an alarm and takes control automatically or manu-
ally, via a Switch Board Unit (SBU), Fig. 9.02.04.
The MCU, BCU and SBU together comprise the
Alpha Cylinder Lubricator Control Unit (ALCU) in
shape of a single steel cabinet which is, as stand-
ard, located in the Engine Control Room. Fig.
9.02.05 shows the wiring diagram for the MAN
B&W Alpha Cylinder Lubrication System.
The yard supply should be according to the items
shown in Fig. 9.02.02 within the broken line.
MAN Diesel
9.02
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