Components For Lubricating Oil System; Lubricating Oil Pump; Lubricating Oil Cooler; Lubricating Oil Temperature Control Valve - Man B&W S80ME-C7 Project Manual

MAN B&W

Components for Lubricating Oil System

Lubricating oil pump

The lubricating oil pump can be of the displace-
ment wheel, or the centrifugal type:
Lubricating oil viscosity, specified...75 cSt at 50 °C
Lubricating oil viscosity .......... maximum 400 cSt *
Lubricating oil flow .............. see 'List of capacities'
Design pump head .......................................4.6 bar
Delivery pressure .........................................4.6 bar
Max. working temperature ............................. 70 °C
* 400 cSt is specified, as it is 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 arange from 00
to 2% of the capacity stated.
The pump head is based on a total pressure drop
across cooler and filter of maximum  bar.
The bypass valve shown between the main lubri-
cating 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 is recommended
to install a throttle valve at position '005' to pre-
vent an excessive oil level in the oil pan if the
centrifugal pump is 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 lubri-
cating 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 is recommended to install a 25 mm valve (pos.
006), with a hose connection after the main lubri-
cating oil pumps, for checking the cleanliness of
the lubricating oil system during the flushing pro-
cedure. The valve is to be located on the under-
side of a horizontal pipe just after the discharge
from the lubricating oil pumps.
MAN B&W S90MC-C7/8, S90MEC7/8,
K90MEC6/9, S80MEC7/8/9

Lubricating oil cooler

The lubricating oil cooler must be of the shell and
tube type made of seawater resistant material, or
a plate type heat exchanger with plate material
of titanium, unless freshwater is used in a central
cooling water system.
Lubricating oil viscosity, specified...75 cSt at 50 °C
Lubricating oil flow .............. see 'List of capacities'
Heat dissipation .................. see 'List of capacities'
Lubricating oil temperature, outlet cooler ...... 45 °C
Working pressure on oil side .......................4.6 bar
Pressure drop on oil side ............maximum 0.5 bar
Cooling water flow .............. see 'List 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 lubricat-
ing oil cooler, we recommend that the seawater
temperature is 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 viscosity, specified ....75 cSt at 50 °C
Lubricating oil flow .............. see 'List of capacities'
Temperature range, inlet to engine .........40  47 °C
MAN Diesel
8.05
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