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Alpha cylinder lubrication system, is designed to supply 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, or could be placed in the engine room.The pump station has two pumps (one operating, the other stand-by with automatic start up) with in-line filters and a heater. 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. Accumulator tanks on the lubricator inlet pipes ensure adequate filling of the lubricator while accumulators on the outlet pipes serve to dampen the pressure fluctuations. On engines with double lubricators, a by pass valve allows for circulating and heating the cylinder oil before starting the engine under cold engine room conditions. On engines with one lubricator 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-lubricated and, during the runningin period, the operator can choose to increase the lubricating oil feed rate to a maximum setting of 200%.

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 dependent’ and ‘load change dependent’ are all incorporated in the MAN B&W Alpha cylinder lubrication system.
       The MAN B&W Alpha Cylinder Lubricator is preferably to be controlled in accordance with the Alpha Adaptive Cylinder oil Control (Alpha ACC) feed rate system. 
The MCU is equipped with a Backup Control Unit (BCU) which, if the MCU malfunctions, activates an alarm and takes control automatically or manually, via a Switch Board Unit.
The MCU, BCU and SBU together comprise the Alpha Cylinder Lubricator Control Unit (ALCU) in shape of a single steel cabinet which is, as standard, located in the Engine Control Room.