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ASTM Standard Describes Common Particles in In-Service Lubricants
The objective of particle examination is to diagnose the operational condition of the machine sampled based on the quantity and type of particles observed in the oil. After break-in, normally running machines exhibit consistent particle concentration and particle types from sample to sample. An increase in particle concentration, accompanied by an increase in size and severity of particle types, is indicative of initiation of a fault. Without particulate debris analysis, in-service lubricant analysis results often fall short of concluding likely root cause or potential severity from analytical results because of missing information about the possible identification or extent of damaging mechanisms. ASTM D7684-11, “Standard Guide for Microscopic Characterization of Particles from In-Service Lubricants,”describes commonly found particles in in-service lubricants, but does not address methodology for quantification of...