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MAN B&W 8.05
Components for Lubricating Oil System
Lubricating oil pump
The lubricating oil pump can be of the d<strong>is</strong>placement
wheel, or the centrifugal type:
Lubricating oil v<strong>is</strong>cosity, specified...75 cSt at 50 °C
Lubricating oil v<strong>is</strong>cosity .......... maximum 400 cSt *
Lubricating oil flow ..............see ‘L<strong>is</strong>t of capacities’
Design pump head .......................................4.4 bar
Delivery pressure .........................................4.4 bar
Max. working temperature ............................. 70 °C
* 400 cSt <strong>is</strong> specified, as it <strong>is</strong> normal practice when
starting on cold oil, to partly open the bypass
valves of the lubricating oil pumps, so as to reduce
the electric power requirements for the pumps.
The flow capacity must be within a range from
00 to 2% of the capacity stated.
The pump head <strong>is</strong> based on a total pressure drop
across cooler and filter of maximum bar.
The bypass valve shown between the main lubricating
oil pumps Fig. 8.0 .0 may be omitted in
cases where the pumps have a built�in bypass or
if centrifugal pumps are used.
If centrifugal pumps are used, it <strong>is</strong> recommended
to install a throttle valve at position ‘005’ to prevent
an excessive oil level in the oil pan if the
centrifugal pump <strong>is</strong> supplying too much oil to the
engine.
During trials, the valve should be adjusted by
means of a device which permits the valve to be
closed only to the extent that the minimum flow
area through the valve gives the specified lubricating
oil pressure at the inlet to the engine at full
normal load conditions. It should be possible to
fully open the valve, e.g. when starting the engine
with cold oil.
It <strong>is</strong> recommended to install a 25 mm valve (pos.
006), with a hose connection after the main lubricating
oil pumps, for checking the cleanliness of
the lubricating oil system during the flushing procedure.
The valve <strong>is</strong> to be located on the underside
of a horizontal pipe just after the d<strong>is</strong>charge
from the lubricating oil pumps.
MAN B&W S70MC6, S70MC-C7/8, S70ME-C7/8,
S70ME-GI7/8, S65ME-C8, S65ME-GI8
MAN Diesel
Lubricating oil cooler
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The lubricating oil cooler must be of the shell and
tube type made of seawater res<strong>is</strong>tant material, or
a plate type heat exchanger with plate material
of titanium, unless freshwater <strong>is</strong> used in a central
cooling water system.
Lubricating oil v<strong>is</strong>cosity, specified...75 cSt at 50 °C
Lubricating oil flow ..............see ‘L<strong>is</strong>t of capacities’
Heat d<strong>is</strong>sipation ..................see ‘L<strong>is</strong>t of capacities’
Lubricating oil temperature, outlet cooler ...... 45 °C
Working pressure on oil side .......................4.4 bar
Pressure drop on oil side ............maximum 0.5 bar
Cooling water flow ..............see ‘L<strong>is</strong>t of capacities’
Cooling water temperature at inlet:
seawater ......................................................... 32 °C
freshwater ....................................................... 36 °C
Pressure drop on water side .......maximum 0.2 bar
The lubricating oil flow capacity must be within a
range from 00 to 2% of the capacity stated.
The cooling water flow capacity must be within a
range from 00 to 0% of the capacity stated.
To ensure the correct functioning of the lubricating
oil cooler, we recommend that the seawater
temperature <strong>is</strong> regulated so that it will not be
lower than 0 °C.
The pressure drop may be larger, depending on
the actual cooler design.
Lubricating oil temperature control valve
The temperature control system can, by means of
a three�way valve unit, by�pass the cooler totally
or partly.
Lubricating oil v<strong>is</strong>cosity, specified ....75 cSt at 50 °C
Lubricating oil flow ..............see ‘L<strong>is</strong>t of capacities’
Temperature range, inlet to engine .........40 � 47 °C
198 42 39�0.3