MAN B&W S65ME-C8.2-GI-TII, Project Manual

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MAN B&W 8.09
Page 1 of 4
MAN Diesel MAN B&W ME/ME-C/-GI engines 198 48 523.5
Separate System for Hydraulic Control Unit
As an option, the engine can be prepared for the
use of a separate hydraulic control oil system
Fig. 8.09.01.
The separate hydraulic control oil system can be
built as a unit, or be built streamlined in the engine
room with the various components placed and
fastened to the steel structure of the engine room.
The design and the dimensioning of the various
components are based on the aim of having a reli-
able system that is able to supply lowpressure oil
to the inlet of the enginemounted highpressure
hydraulic control oil pumps at a constant pres-
sure, both at engine standby and at various en-
gine loads.
Cleanliness of the hydraulic control oil
The hydraulic control oil must fulfil the same
cleanliness level as for our standard integrated
lube/cooling/hydrauliccontrol oil system, i.e. ISO
4406 XX/16/13 equivalent to NAS 1638 Class 7.
Information and recommendations regarding
flushing, the specified cleanliness level and how
to measure it, and how to use the NAS 1638 oil
cleanliness code as an alternative to ISO 4406,
are available from MAN Diesel & Turbo.
Control oil system components
The hydraulic control oil system comprises:
1 Hydraulic control oil tank
2 Hydraulic control oil pumps (one for standby)
1 Pressure control valve
1 Hydraulic control oil cooler, watercooled by the
low temperature cooling water
1 Threeway valve, temperature controlled
1 Hydraulic control oil filter, duplex type or auto-
matic selfcleaning type
1 Hydraulic control oil fine filter with pump
1 Temperature indicator
1 Pressure indicator
2 Level alarms
Valves and cocks
Piping.
Hydraulic control oil tank
The tank can be made of mild steel plate or be a
part of the ship structure.
The tank is to be equipped with flange connec-
tions and the items listed below:
1 Oil filling pipe
1 Outlet pipe for pump suctions
1 Return pipe from engine
1 Drain pipe
1 Vent pipe.
The hydraulic control oil tank is to be placed at
least 1 m below the hydraulic oil outlet flange, RZ.
Hydraulic control oil pump
The pump must be of the displacement type (e.g.
gear wheel or screw wheel pump).
The following data is specified in Table 8.09.02:
• Pump capacity
• Pump head
• Delivery pressure
• Working temperature
• Oil viscosity range.
Pressure control valve
The valve is to be of the selfoperating flow control-
ling type, which bases the flow on the predefined
pressure set point. The valve must be able to react
quickly from the fullyclosed to the fullyopen posi-
tion (t
max
= 4 sec), and the capacity must be the
same as for the hydraulic control oil lowpressure
pumps. The set point of the valve has to be within
the adjustable range specified in a separate draw-
ing.
The following data is specified in Table 8.09.02:
• Flow rate
• Adjustable differential pressure range across
the valve
• Oil viscosity range.