Gaseous cavitation due to inadequate oil flow to pumps and bearings.Excessive heat generation resulting in oil oxidation, sludge, and varnish build-up.Likewise, too high a viscosity can cause: Oil film failure at high temperatures, high loads, or during start-ups or coast-downs.Increased sensitivity to particle contamination due to reduced oil film.Increased mechanical friction causing excessive energy consumption n Heat generation due to mechanical friction n Internal or external leakage.Loss of oil film causing excessive wear.Typical industrial oil limits are set at ±5 percent for caution, and ☑0 percent for critical, although severe-duty applications and extremely critical systems should have even tighter targets.Ī significant reduction in viscosity can result in: Even small changes in viscosity can be magnified at operating temperatures to the extent that an oil is no longer able to provide adequate lubrication. Monitoring and trending viscosity is perhaps one of the most important components of any oil analysis program. An oil’s viscosity is then classified according to one of a number of different classifications. The most common way that viscosity is measured is Kinematic Viscosity, reported in centistokes (cSt). As temperature increases, viscosity decreases and as temperature decreases, viscosity increases. The viscosity of any fluid changes inversely with temperature. It is defined as a measure of a lubricant's resistance to flow. The most important single property of a lubricant is its viscosity.
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