MAN B&W
8.09
Page of 4
MAN Diesel
MAN B&W ME/ME-C/ME-GI engines
198 48 523.2
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. 8.09.0.
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. The quality of the hydraulic control oil
must fulfil the same grade as for our standard in-
tegrated lube/cooling/hydrauliccontrol oil system,
i.e. ISO 4406 XX/6/3 equivalent to NAS 638
Class 7.
The hydraulic control oil system comprises:
Hydraulic control oil tank
2 Hydraulic control oil pumps (one for standby)
Pressure control valve
Hydraulic control oil cooler, watercooled by the
low temperature cooling water
Threeway valve, temperature controlled
Hydraulic control oil filter, duplex type or auto-
matic selfcleaning type
Hydraulic control oil fine filter with pump
Temperature indicator
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:
Oil filling pipe
Outlet pipe for pump suctions
Return pipe from engine
Drain pipe
Vent pipe.
The hydraulic control oil tank is to be placed at
least 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 Fig. 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 on a separate
drawing.
The following data is specified in Fig. 8.09.02:
• Flow rate
• Adjustable differential pressure range across
the valve
• Oil viscosity range.
Hydraulic control oil cooler
The cooler must be of the plate heat exchanger or
shell and tube type.
The following data is specified in Fig. 8.09.02:
• Heat dissipation
• Oil flow rate
• Oil outlet temperature
• Maximum oil pressure drop across the cooler
• Cooling water flow rate
• Water inlet temperature
• Maximum water pressure drop across the cooler.
Temperature controlled threeway valve
The valve must act as a control valve, with an ex-
ternal sensor.
The following data is specified in Fig. 8.09.02:
• Capacity
• Adjustable temperature range
• Maximum pressure drop across the valve.
Содержание B&W S80ME-C7
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