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51
tial pressure is lost because of the
filter's location within the system.
Each of these factors must be
considered for the filtration system
to work effectively.
Of course, filtration is only half
of the equation. Contamination
control involves not just removing
particles but also keeping them
from entering the system. If more
particles are coming into the system
from ingression points like breather
points, hatches and seals than being
removed, the system will never be
clean. erefore, you must have a
balance of contaminant exclusion
and contaminant removal methods.
If an alternative approach is
needed to remove contaminants from
the hydraulic oil, technologies such
as centrifugation, magnetic filtra-
tion or a combination of periodic,
portable filtration systems may be
implemented. Although filters can be
very efficient, sometimes they are not
enough and must be complemented
with other methods to remove the
finer particles. For instance, with
magnetic filtration, ferromagnetic
particles can be captured regardless
of their size. ese types of particles
often make up nearly 90 percent of
particles suspended in oil.
Centrifuges also offer advantages
over traditional filter media. The
efficiency of a centrifuge is consistent
throughout its service, and the lower
limit of its particle size trapping capa-
bility can be much less than 1 micron.
While several other technologies
are available to enhance the abilities
of a typical oil filter, the best advice
would be to thoroughly evaluate the
filter system currently installed and
then develop a plan of action based
on the findings.
ML
If you have a question for
one of
Noria's experts, email it
to editor@noria.com.
ML
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