MAN B&W 7.05
Page of
MAN Diesel
MAN B&W MC/MC-C, ME/ME-C/ME-GI/ME-B engines,
MC/ME Engine selection guides
198 47 35-0.2
Fuel oil lter
The lter can be of the manually cleaned duplex
type or an automatic lter with a manually cleaned
bypass lter.
If a double lter (duplex) is installed, it should
have sufcient capacity to allow the specied full
amount of oil to ow through each side of the lter
at a given working temperature with a max. 0.
bar pressure drop across the lter (clean lter).
If a lter with backushing arrangement is
installed, the following should be noted. The re-
quired oil ow specied in the ‘List of capacities’,
i.e. the delivery rate of the fuel oil supply pump and
the fuel oil circulating pump, should be increased
by the amount of oil used for the backushing, so
that the fuel oil pressure at the inlet to the main en-
gine can be maintained during cleaning.
In those cases where an automatically cleaned
lter is installed, it should be noted that in order
to activate the cleaning process, certain makers of
lters require a greater oil pressure at the inlet to
the lter than the pump pressure specied. There-
fore, the pump capacity should be adequate for
this purpose, too.
The fuel oil lter should be based on heavy fuel oil
of: 10 cSt at 80 °C = 700 cSt at 50 °C = 7000 sec
Redwood I/100 °F.
Fuel oil ow .........................see ‘List of capacities’
Working pressure .......................................... 10 bar
Test pressure ...................... according to class rule
Absolute neness .......................................... 50 µm
Working temperature .................. maximum 150 °C
Oil viscosity at working temperature ............15 cSt
Pressure drop at clean lter ........maximum 0. bar
Filter to be cleaned at a pressure
drop of ........................................maximum 0.5 bar
Note:
Absolute neness corresponds to a nominal ne-
ness of approximately 35 µm at a retaining rate of
90%.
The lter housing shall be tted with a steam jack-
et for heat tracing.
Fuel oil venting box
The design of the Fuel oil venting box is shown in
Fig. 7.05.02. The size is chosen according to the
maximum ow of the fuel oil circulation pump,
which is listed in section 6.0.
178 38 393.3
Flushing of the fuel oil system
Before starting the engine for the rst time, the
system on board has to be ushed in accordance
with MAN Diesel’s recommendations ‘Flushing of
Fuel Oil System’ which is available on request.
Flow m
3
/h
Q (max.)*
Dimensions in mm
D1 D2 D H1 H2 H H4 H5
1.
150 2 15 100 600 171. 1,000 550
2.1 150 40 15 100 600 171. 1,000 550
5.0 200 65 15 100 600 171. 1,000 550
8.4 400 80 15 150 1,200 .5 1,800 1,100
11.5 400 90 15 150 1,200 .5 1,800 1,100
19.5 400 125 15 150 1,200 .5 1,800 1,100
29.4 500 150 15 150 1,500 402.4 2,150 1,50
4.0
500 200 15 150 1,500 402.4 2,150 1,50
* The maximum ow of the fuel oil circulation pump
Fig. 07.05.02: Fuel oil venting box
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