MAN B&W 8.02
Page 1 of 2
MAN Diesel
198 42 31-6.3MAN B&W 98-60ME/ME-C/-GI engines
Hydraulic power for the ME hydraulic-mechanical
system for activation of the fuel injection and the
exhaust valve is supplied by the Hydraulic Power
Supply (HPS) unit.
As hydraulic medium, normal lubricating oil is
used, as standard taken from the engine’s main
lubricating oil system and filtered in the HPS unit.
HPS connection to lubrication oil system
Internally on the engine, the system oil inlet RU is
connected to the HPS unit which supplies the hy-
draulic oil to the Hydraulic Cylinder Units (HCUs).
See Figs. 16.01.02a and 16.01.02b.
RW is the oil outlet from the automatic backflush-
ing filter.
The hydraulic oil is supplied to the Hydraulic Cyl-
inder Units (HCU) located at each cylinder, where
it is diverted to the electronic Fuel Injection sys-
tem, and to the electronic exhaust Valve Activation
(FIVA) system, which perform the fuel injection
and opens the exhaust valve. The exhaust valve is
closed by the conventional ‘air spring’.
The electronic signals to the FIVA valves are given
by the Engine Control System, see Chapter 16,
Engine Control System (ECS).
HPS configurations
The HPS pumps are driven either mechanically
by the engine (via a step-up gear from the crank-
shaft) or electrically.
With mechanically driven pumps, the HPS unit
consists of:
• an automatic and a redundant filter
• three to five engine driven main pumps
• two electrically driven start-up pumps
• a safety and accumulator block
as shown in Fig. 8.02.01.
With electrically driven pumps, the HPS unit dif-
fers in having a total of three pumps which serve
as combined main and start-up pumps.
The HPS unit is mounted on the engine no matter
how its pumps are driven.
HPS unit types
Altogether, three HPS configurations are available:
• STANDARD mechanically driven HPS, EoD: 4 40
160, with mechanically driven main pumps and
start-up pumps with capacity sufficient to de-
liver the start-up pressure only. The engine can-
not run with all engine driven main pumps out of
operation, whereas 66% engine load is available
in case one main pump is out
• COMBINED mechanically driven HPS unit, EoD:
4 40 167 with electrically driven start-up pumps
with back-up capacity. In this case, at least 15%
engine power is available as back-up power if all
engine driven pumps are out
• electrically driven HPS, EoD: 4 40 161, with 66%
engine load available in case one pump is out.
The electric power consumption of the electrically
driven pumps should be taken into consideration
in the specification of the auxilliary machinery ca-
pacity.
Hydraulic Power Supply Unit
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