Fuel Oil Filter; Fuel Oil Venting Box; Flushing Of The Fuel Oil System - Man B&W L35MC6-TII Project Manual

MAN B&W

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 increased
by the amount of oil used for the backflushing, 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
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. There-
fore, 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 of ........................................maximum 0.5 bar
Note:
Absolute fineness corresponds to a nominal fine-
ness of approximately 35 µm at a retaining rate of
90%.
The filter housing shall be fitted with a steam jack-
et for heat tracing.
MAN B&W MC/MC-C, ME/ME-C/ME-GI/ME-B engines,
MC/ME Engine selection guides

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 flow of the fuel oil circulation pump,
which is listed in section 6.0.
Flow m /h
3
Q (max.)*
D1
1. 150
2.1 150
5.0 200
8.4 400
11.5 400
19.5 400
29.4 500
4.0 500
* The maximum flow of the fuel oil circulation pump
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 Diesel's recommendations 'Flushing of
Fuel Oil System' which is available on request.
MAN Diesel
Dimensions in mm
D2 D H1 H2
2 15 100 600 171. 1,000
40 15 100 600 171. 1,000
65 15 100 600 171. 1,000
80 15 150 1,200 .5 1,800 1,100
90 15 150 1,200 .5 1,800 1,100
125 15 150 1,200 .5 1,800 1,100
150 15 150 1,500 402.4 2,150 1,50
200 15 150 1,500 402.4 2,150 1,50
7.05
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H H4 H5
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