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Bewildering Oil Analysis Results
Bob Stagg, Sales Rep., Analysts, Inc.
The first action should be to verify that the samples
were taken correctly. If the samples were taken from the
bottom of a reservoir where larger particles will collect
over time, this will give inaccurate results of actual
operating conditions. If the samples were not taken correctly,
take new samples to accurately quantify the results. At
the same time, verify that the additive packages of the
oil are at the levels of the base oil. If all of these
requirements are met then FERROGRAPHIC ANALYSIS should
be done.
FA can identify the type of particles inherent to the
samples. These particles could be fibers from filters,
dirt/dust, or from components that are innate to the equipment
being operated or extraneous to the operation. It is important
to note that this will microscopically identify particles
greater than 14 microns. The types of particles identified
will then give direction to finding the root cause of
the problem, such as:
FILTER FIBERS
Verify the Beta rating of the filter being used and check
its condition. Replace if necessary with new or proper
filter.
DIRT/DUST
Check the cover plates and breathers for any possibility
of ingress of environmental contaminants. Also, look for
any major events that might have occurred recently, such
as construction or environmental changes.
METALS INHERENT TO EQUIPMENT
This is an early indication of a potential deteriorating
condition. Plan an investigation of bearings, gears, impellers
or whatever might comprise the mechanical components.
Take appropriate action that may include a planned shutdown
pre-emptive to a catastrophic event.
EXTRANEOUS METALS
Check for tramp oil or ingress of contaminants. Perhaps
waste oil was inadvertently added.
IN ADDITION
It is always recommended that oil storage and handling
be controlled and inspected on a regular basis.
IN SUMMATION
If after the identified possibilities are eliminated,
it may be time to schedule a planned repair shutdown rather
than waiting for a more costly catastrophic outage.
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