Man B&W S80ME-C7, Project Manual

Page: 175 / 353

MAN B&W 7.05
Page of
MAN Diesel
MAN B&W S90MEC, S80MEC, K80MEC 198 41 179.0
Fuel oil filter
The filter can be of the manually cleaned duplex
type or an automatic filter with a manually cleaned
bypass filter.
If a
double filter (duplex) is installed, it should
have sufficient capacity to allow the specified full
amount of oil to flow through each side of the filter
at a given working temperature with a max. 0.
bar pressure drop across the filter (clean filter).
If a filter with backflushing arrangement is
installed, the following should be noted. The re-
quired oil flow specified in the ‘List of capacities’,
i.e. the delivery rate of the fuel oil supply pump
and the fuel oil circulating pump, should be in-
creased by the amount of oil used for the back-
flushing, so that the
fuel oil pressure at the inlet to the main engine can
be maintained during cleaning.
In those cases where an
automatically cleaned
filter is installed, it should be noted that in order
to activate the cleaning process, certain makers
of filters require a greater oil pressure at the inlet
to the filter than the pump pressure specified.
Therefore, the pump capacity should be adequate
for this purpose, too.
The fuel oil filter 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 flow .........................see ‘List of capacities’
Working pressure ..........................................10 bar
Test pressure ...................... according to class rule
Absolute fineness .......................................... 50 µm
Working temperature .................. maximum 150 °C
Oil viscosity at working temperature ............15 cSt
Pressure drop at clean filter ........maximum 0. bar
Filter to be cleaned at a pressure
drop at ........................................maximum 0.5 bar
Note:
Absolute fineness corresponds to a nominal fine-
ness of approximately 30 µm at a retaining rate of
90%.
The filter housing shall be fitted with a steam jack-
et for heat tracing.
H4
H1
H2
H
H5
200
Top of fuel oil
service tank
60
Vent pipe,
nominal: D
Cone
Inlet pipe,
nominal: D2
Pipe,
nominal: D1
Outlet pipe,
nominal: D2
Fuel oil venting box
The design is shown on ‘Fuel oil venting box’, see
Fig. 7.05.02
Flow m /h Dimensions in mm
Q (max.)* D1 D2 D H1 H2 H H4 H5
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
Fig. 07.05.02: Fuel oil venting box
Flushing of the fuel oil system
Before starting the engine for the first time, the
system on board has to be flushed in accordance
with MAN B&W’s recommendations ‘Flushing of
Fuel Oil System’ which is available on request.
* The actual maximum flow of the fuel oil circulation pump
178 38 393.2