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MACHINERY LUBRICATION
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composition. Often missed
in the discussion on particle
contamination are the ghost
riders that lurk in your oil.
ese contaminants, which
go unnoticed by ma inte-
nance staff and unmeasured
and unreported by oil anal-
ysis labs, need to be exposed
and understood.
Defining Ghost
Riders
Today's owners of lubri-
c ate d me c h a n ic a l a s se t s
wa nt to minimize ma in-
tenance and repair costs.
C on su mable s l i ke lubri-
cants are often targeted for
cost reduction. ese days,
lubricants are formulated to
be increasingly robust and
resistant to chemical degra-
dation from heat, oxidation
and operating conditions.
is physical and chemical
stabilit y enables fewer oil
changes and lowers the cost
of lubricant consumption.
is is a good thing, but
sadly there is a downside to
extended oil drains or, in some
cases, no oil drains. e longer
a lubricant remains in service,
the longer it is exposed to
particle contamination from a
variety of ingression sources.
Additionally, most particles
that invade a lubricant are
very small. Small particles
enter more easily than large
particles. For instance, for
each 10-micron particle that
ingresses into the oil, there
may be ten 3-micron particles.
Figure 1. Small particles can pass unimpeded
through a filter.
