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About filtration.......
A modern diesel engine requires several thousand times as much
air as it does fuel.And this air needs to be nearly 100% clean for
an efficient protection of your equipment.That is why it is
important to care for your air filtration system, and to use the
proper air filterelements.In addition to this essential mission of
protecting the engine, a good filter will allow for fuelsavings,
will enable longer service intervals, and will reduce the
maintenance costs.
The design of an air filter is based on:- The amount of air flow
that the engine needs for efficient combustion.- The maximum
resistance to this air flow that the engine can support.- The
objectives set by the engine manufacturer for filtration
efficiency.- The weight of dirt that will need to be hold during
the specified service interval
The amount of air flow that the engine needs, will define the
size of the filter.For a 4 stroke engine, the flow rate is
calculated as follows :Q m3/mn = Volume per cylinder x Nb of
cylinders x Rev/mn x Efficiency / 2000In the case of a Diesel
engine generating 280 cv at 2900 rev/mn, 8 cylinders of 0.7 liter
each,turbocharged with intercooler, the flow rate is :Q m3/mn = 8 x
0.7 x 2900 x 1.85 / 2000 = 15 m3/mnThis means that the filter must
handle 900 m3 each hour !!!
Filtration Efficiency and Pressure Drop will depend on the
specifications of themedia.The efficiency of a filter is measured
either in % or with the Beta Ratio.Percentage is most commonly used
for the definition of air filter efficiency.Efficiency is the
percentage of particles of a specified size that the filter will
stop.For example, a filter has an efficiency of 99.5% at 3 m, if it
stops 99.5% of the particles of 3m that are sent to the inlet of
the filter. A percentage of efficiency that does not specify
thesize of the particles, does not mean anything.Pressure drop is
the difference of pressure between two points. In the case of air
filter, it is thedifference of pressure between the inlet and the
outlet. It is the restriction to the air flow,created by the
filtering media.
Filter efficiency improves as the "dust cake" builds up on the
surface of the media.Consequently, you do not have to replace your
filter just because it looks dirt !You should either follow the
service interval specified by the manufacturer of the equipment
or,Use a restriction gauge as part of your filter maintenance
program.
The weight of dust that 2 filters of equal size will be able to
retain will depend onhow well the filtering area is used.The GPC
"Space Lock" system, made of a flat at several places on the edge
of the pleat inorder to guarantee the necessary space between them,
and made of a "Hot Melt" band aroundthe pleats to prevent them from
opening wide, was developed to guarantee the total use of
theavailable area of filtration.
The process to replace an air filter includes the following
steps:- Turn off the ignition.- Wipe off all dust from the cover of
the housing.- Carefully remove the filter element to prevent dirt
from falling into the air intake.- Use a clean, moist cloth to wipe
the dust away from the air intake and gasket sealing.- If the
filter has an inner element, leave it in place while servicing the
outer element.- Before you install the new element, check that it
is not damaged.- Make sure it fits properly, and that all clamps to
tighten the cover will seat uniformly.- Do not forget to inspect
the old element for signs of potential engine problems.
It is not recommended to clean air filter elements.Since all the
dust cannot be removed, the service interval will get
shorter.Because there is a very high risk of damaging the filter
during the cleaning process, you willloose the warranty on the
filter after cleaning.
2/20/2013 GPC Filters
www.gpcfilters.it/eng/filtrazione.asp 1/2
loose the warranty on the filter after cleaning.
As a conclusion, remember these little tips:- Do not take away
the filter to inspect it. Just follow the recommended service
interval, or usea restriction gauge.- Do not bang a filter to clean
it, do not blow it, and do not wash it. Although a GPC filter
wouldresist to these, your maintenance program would be lost.- Do
not let anything enter the intake side. It is a direct entrance to
your engine that has to beprotected by the filter.- Check the
condition of the housing, of the cover, of the intake pipes, and of
the sealing areas.Some rust for example, would reveal a non
tightening and therefore defective assembly.- A poor filtration can
let your engine be destroyed in less than 15 minutes !!!
GPC Air Filters are designed to provide you with the best
quality for the best price!
