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MAN B&W 8.09
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 reliable
system that <strong>is</strong> able to supply low�pressure oil
to the inlet of the engine�mounted high�pressure
hydraulic control oil pumps at a constant pressure,
both at engine stand�by and at various engine
loads. The quality of the hydraulic control oil
must fulfil the same grade as for our standard integrated
lube/cooling/hydraulic�control oil system,
i.e. ISO 4406 XX/ 6/ 3 equivalent to NAS 638
Class 7.
The hydraulic control oil system compr<strong>is</strong>es:
Hydraulic control oil tank
2 Hydraulic control oil pumps (one for stand�by)
Pressure control valve
Hydraulic control oil cooler, water�cooled by the
low temperature cooling water
Three�way valve, temperature controlled
Hydraulic control oil filter, duplex type or automatic
self�cleaning 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 <strong>is</strong> to be equipped with flange connections
and the items l<strong>is</strong>ted below:
Oil filling pipe
Outlet pipe for pump suctions
Return pipe from engine
Drain pipe
Vent pipe.
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The hydraulic control oil tank <strong>is</strong> to be placed at
least m below the hydraulic oil outlet flange, RZ.
Hydraulic control oil pump
The pump must be of the d<strong>is</strong>placement type (e.g.
gear wheel or screw wheel pump).
The following data <strong>is</strong> specified in Fig. 8.09.02:
• Pump capacity
• Pump head
• Delivery pressure
• Working temperature
• Oil v<strong>is</strong>cosity range.
Pressure control valve
The valve <strong>is</strong> to be of the self�operating flow controlling
type, which bases the flow on the pre�defined
pressure set point. The valve must be able to react
quickly from the fully�closed to the fully�open position
(t max = 4 sec), and the capacity must be the
same as for the hydraulic control oil low�pressure
pumps. The set point of the valve has to be within
the adjustable range specified on a separate
drawing.
The following data <strong>is</strong> specified in Fig. 8.09.02:
• Flow rate
• Adjustable differential pressure range across
the valve
• Oil v<strong>is</strong>cosity range.
Hydraulic control oil cooler
The cooler must be of the plate heat exchanger or
shell and tube type.
The following data <strong>is</strong> specified in Fig. 8.09.02:
• Heat d<strong>is</strong>sipation
• 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 three�way valve
The valve must act as a control valve, with an external
sensor.
The following data <strong>is</strong> specified in Fig. 8.09.02:
• Capacity
• Adjustable temperature range
• Maximum pressure drop across the valve.
MAN B&W ME/ME-C/ME-GI engines 198 48 52�3.2
MAN Diesel