Solid-particle Suspensions
Solid-particle Suspensions
Solid-particle Suspensions
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iodegradability and thermal stability. And<br />
there is a slew of properties relating specifically<br />
to grease formulation including<br />
consistency, dropping point, separability,<br />
water wash-out, pumpability, etc.<br />
While it is true that commercial oil analysis<br />
labs will not be conducting performance<br />
tests on in-service oils any time soon, the<br />
need and application are still very real. The<br />
following are examples of when performance<br />
testing is both practical and vitally needed:<br />
• After oil reclamation or oil reconditioning<br />
(especially when dehydrators<br />
and acid scavengers have been used)<br />
• After in-machine additive reconstruction<br />
• When the compatibility of two mixed<br />
oils is in question<br />
• After extreme exposures (for example,<br />
radiation, heat, chemical, etc.)<br />
• After prolonged storage<br />
• Before or after a major outage<br />
• After a long shutdown period<br />
• Before starting standby equipment in<br />
critical applications<br />
• After a chemical flush where there is risk<br />
of residual chemical mixtures<br />
• For lubricants exposed to extremely long<br />
service life<br />
• When a defective and faulty new oil<br />
formulation is suspected<br />
There are probably numerous other<br />
instances when performance testing can be<br />
justified. In general, when in doubt, consider<br />
running tests that can help confirm performance<br />
properties you need and expect from the<br />
lubricant in question. Although expensive and<br />
time consuming, the benefits can far outreach<br />
the costs and hassle to perform. POA<br />
About the Author<br />
Jim Fitch has a wealth of “in the trenches” experience<br />
in lubrication, oil analysis, tribology and machinery<br />
failure investigations. Over the past two decades, he has<br />
presented hundreds of lectures on these subjects. Jim<br />
has published more than 200 technical articles, papers<br />
and publications. He serves as a U.S. delegate to the<br />
ISO tribology and oil analysis working group. Since<br />
2002, he has been director and board member of the<br />
International Council for Machinery Lubrication. He cofounded<br />
Noria Corporation in 1997 and remains an<br />
active chairman and senior technical consultant.<br />
Contact Jim at jfitch@noria.com.<br />
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