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

mahle.ako@mahle.com

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

industrialfiltration@mahle.com

www.mahle-industrialfiltration.com