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Category Archives: Routine Testing

Ferrous Wear Concentration versus PQ Index

Ferrous Wear Concentration versus PQ Index Since elemental spectroscopy is generally accepted as having lower accuracy measuring wear particles larger than approximately 10 microns, most labs employ some form of simple, large particle analysis specific to ferrous content. Ferrous content is chosen not only because it tends to represent the most common metal in machines,…
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Variability in Oil Analysis Results

Variability in Oil Analysis Results Two consecutive samples, at normal sampling intervals from the same machine, are never expected to have exactly the same results, but occasionally the second set of results appears to have either changed by more than a normal amount, or possibly have shifted in a counter-intuitive direction (i.e. gotten better without…
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Setting Acid Number and Base Number Limits

Setting Acid Number and Base Number Limits There is a rule-of-thumb that oil should be condemned at double its new oil Acid Number, or at half of its new oil Base Number. The problem with this rule is that is has too many exceptions to be valid. Rather than identify the valid instances, it is…
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Understanding Particle Counting Methods

Understanding Particle Counting Methods Particle counting is considered by many to be one of the most important test for used oil analysis. Many problems can be quickly and easily identified by monitoring the number and size-distribution of particles in an oil sample. The ISO Code is the most common unit of reporting the number of…
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Know the Proper Base Number of Your Oil

Know the Proper Base Number of Your Oil The base number (BN) is a property that is more associated with engine oils rather than industrial oils. It can be defined as the oil’s ability to neutralize acids that are produced during use. The higher the base number in the engine oil, the more acid it…
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Testing For Water

Testing For Water Water is one of the most destructive contaminants faced by industrial maintenance departments.  Studies have shown that water present at any level can reduce bearing life from 10 to 100 times.  While the overall tolerance for water varies from machine to machine, a good general alarm limit for water contamination is 0.05%…
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