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RELIABLE EFFICIENCYSYSTEMATIC FUEL FILTRATION
FUEL FILTER MAHLE COM plus
of highly viscous fluids, including middle distilla-
tes and bio diesel, even at temperatures excee-
ding 150ºC. The cleaning and discharging of fil-
tered solids into the sludge tank is effected
without affecting the throughput rate and the ser-
vice pressure by means of an intelligent filter con-
trol. The flush volume is reduced to a minimum
by the geometric volume of the compensator.
The COM plus thus ensures a constantly high
efficiency of the drive unit.
The filtration of fuel, particularly when using
heavy oil (DMC), places high demands on the
cleaning and throughput of the filter. The COM
plus fuel filter belongs to a filter series which was
designed specifically for the large engines sector
and is used for cleaning fuel for big pistons. The
COM plus is based on a proven flush nozzle prin-
ciple and enables the filter to be flushed without
a pressure drop and without affecting the effi-
ciency of the process. It can be used for all kinds
2
MAHLE: Fuel filtration solutions
Series MAHLE COM plus MAHLE COM plus with manual by-pass filter and
change-over element
Description Fully automatic back-flushing filterwith tempered own medium
Fully automatic back-flushing filterwith tempered own medium
Nominal width of connecting flange DN 25–DN 100 DN 25–DN 100
Housing material GGG 40 GGG 40
Service pressure Up to 16 bar Up to 16 bar
Max. service pressure 160° C 160°C
Filter element Pleated single or double insert Pleated single or double insert
Max. filter fineness 10 µm absolute 10 µm absolute
Back-flushing control Differential pressure-dependent or switched by time interval
Differential pressure-dependent or switched by time interval
Options Integrated heating (steam/thermal oil) Integrated heating (steam/thermal oil)
MAHLE BACK-FLUSHING FILTERSTRIED AND TESTED FOR MANY YEARS, SEAWORTHY AND EFFICIENT
3
Filtration
The medium being filtered flows
at service temperature via the fil-
ter inlet (1) of the heated filter
vessel into the filter insert (2),
which is open at the bottom of
the automatic filter. This compri-
ses a cylindrical single or double
body, over which the pleated
wire cloth cylinders with the spe-
cified filtration fineness are stret-
ched. Any particles in the
medium are deposited on the
outside of the inner filter or on
the inside of the outer filter.
The cleaned medium flows into
the clean section and flows out
of the filter housing via the outlet
connection (3). As the amount of
contamination in the wire cloth
increases, the difference bet-
ween the inlet pressure (conta-
minated side) and outlet pres-
sure (clean side) also rises. This
differential pressure is measured
by pressure transmitters at the
inlet and outlet and is transmitted
to the filter control. The PLC
module installed there automa-
tically triggers the back-flushing
cycle once a predefined differen-
tial pressure or time interval is
reached.
Back-flushing cycle
On reaching a maximum diffe-
rential pressure or a preset time,
the cleaning cycle is triggered.
The gear motor (4) starts to
rotate the filter element and filte-
red, tempered plant medium
flows at high velocity over the
entire filtration surface into the
fixed flush nozzles (5). The flow
is in the opposite direction of the
filtration process so that dirt par-
ticles which have been deposi-
ted on the wire cloth are carried
away and discharged via the
contaminated side of the com-
pensator (6). A flush valve (3-
way) (7) connects the contami-
nated side of the compensator
to the flush channel.
The clean side of the compensa-
tor stores the amount of clean
flushing medium required for an
effective flushing cycle. It is
pressed into the clean section of
the filter by the piston disc. The
storage tank is filled with filtered
and tempered medium at the
same time as sludge is dischar-
ged into the sludge tank (8), thus
maintaining a constant system
pressure. There is no perceptible
pressure drop.
MAHLE COM plus
7
1
3
8
2
4
6
5
4
MAHLE Industriefiltration provides customers
with a special innovation for fuel filtration: the
MAHLE COM plus filter combination is the most
reliable way to filter fuel and has the following
advantages:
None of the medium escapes when the flush
volume is transferred from the clean side of the
compensator to the contaminated side. This
means there is no pressure drop.
MAHLE filters have proved their efficiency and
operational reliability in 10-micron filtration for
many years. The flush volume (filtered medium)
stored in the compensator is kept at operating
temperature until the back-flushing cycle takes
place.
The back-flushing process uses the plant’s own
medium (filtered medium) at operating tempera-
ture. This prevents the wire cloth from sticking
together, which can occur in back-flushing pro-
cesses conducted with foreign media (e.g.
compressed air) as a result of possible tempe-
rature differences.
Due to extensive quality tests (in our own lab
and external labs and institutes), we can gua-
rantee that in the event of the fuel treatment
system (separator) failing, the MAHLE COM
plus can take over the task of cleaning the
medium for up to 12 hours without the wire
mesh being destroyed.
Furthermore, in exceptional cases the filter can
be started up at bunker temperature – an
increased resistance due to a lower fuel visco-
sity can be offset by the MAHLE COM plus.
And in a final step, maintenance of the filter is
quick and simple as only 1 or 2 wire mesh cylin-
ders have to be replaced.
4Phase 1:Filtration
Phase 2:Back-flushing cycle
Phase 3:Compensatorcharging anddraining ofsludge into thesludge tank
Reliability down to the finest detail
MAHLE fuel filters are particularly suited to pro-
ving their reliability on board. Thanks to their per-
fect filtration performance and undisturbed ope-
ration, our products are especially popular in
shipbuilding. However, power stations have also
been using our fuel filtration systems for several
years.
All MAHLE filters and accessories are extremely
The efficiency and profitability of large engines in
the marine industry or in combined heat and
power stations is largely dependent on their con-
tinuous operation. The cleanliness of the fuel that
is supplied to these engines constitutes an extre-
mely important factor with regard to their service
life. This is because one of the main causes of
defects and failures is the premature wearing of
components as a result of dirt in the system.
The problem here is that the quality and impurity
of diesel on the market varies greatly, ranging
5
A SYSTEM THAT GUARANTEES RELIABLE ENGINE OPERATION
Process waterfilter s
Drinking waterfilters
Lubricating oilfilter s
Simplex/Duplexfilters
from marine diesel to heavy fuel oil. The worse
the quality, the higher the susceptibility to faults
and the higher the wear rate for the engines.
However, there is a way to counteract this: The
filter performance must be that good that even
diesel of the worst quality can be made eminently
usable. MAHLE supplies fuel filtration systems
that are optimized to deal with the requirements
of large engines. This is particularly important in
the marine industry:
MAHLE automatic filtration systems also operate
reliably and safely in fully automatic operation.
robust and boast impressive service lives. They
require minimal maintenance and have a com-
pact design. MAHLE offers customers an exten-
sive range of services all over the world. The
company’s extensive network of agents ensures
that customers are helped by competent engi-
neers and technicians wherever they are. Expe-
rienced service teams are available for commis-
sioning and maintenance tasks worldwide.
Performance through cleanliness
MAHLE FUEL FILTERS
70529563.08/2010
www.mahle-industrialfiltration.com
MAHLE Industriefiltration GmbH
Plant Flintbek
Hörn 14
D-24220 Flintbek
Phone +49 (0) 43 47-904-0
Fax +49 (0) 43 47-904-120
www.mahle-industrialfiltration.com
MAHLE Filtersysteme GmbH
Industriefiltration
Schleifbachweg 45
D-74613 Öhringen
Phone +49 (0) 79 41-67-0
Fax +49 (0) 79 41-67-234 29
www.mahle-industrialfiltration.com