The physical unit for kinematic viscosity is the stokes (St), named after George Stokes. Kinematic viscosity has SI units of m2 s−1. Kinematic viscosity: Kinematic viscosity is the ratio of dynamic viscosity to density. It is more commonly expressed, particularly in ASTM standards, as centipoise (cP).Ģ. The physical unit for dynamic viscosity in the centimetre gram second system of units (cgs) is the poise (P). Dynamic viscosity: Dynamic viscosity is also known as absolute viscosity. The SI physical unit of dynamic viscosity (μ) is the Pascal-second (Pa s), identical to 1 kg m−1 s−1. There are two notations used for viscosity:ġ. These are liquids like water in vegetable oil. These are liquids like honey sunscreen and dish soap liquids that are not resistant to flow or flow fast have low viscosity. Liquids that are resistant to flow or flow slowly has high viscosity. Viscosity characterizes fluids resistance to flow. Viscosity Test: To check oil’s viscosity, at first one should understand the definition of viscosity. Lubricants Properties: This type of analysis focuses on identifying the lubricant’s current physical and chemical state and defining its remaining useful life (RUL).Ĭontamination: By doing lubricant contamination analysis, we can detect the presence of destructive contaminants, and by narrowing down their probable sources (internal or external), we can identify the probable root cause of machine failure. Three main categories of lubricant analysis When an abnormal condition or parameter is identified through lubricants like oils & grease analysis, immediate actions can be taken to identify the root cause or mitigate a developing failure. The lubricants analysis program aims to verify that a lubricated machine is operating according to expectations. In this modern era, lubricant analysis sensors can be installed right on the machines to get real-time information. And the easiest method & first step to do lubricant analysis is to take some sample of oil or grease from the machine & send it to the lubricant analysis laboratory for testing. Lubricant analysis can be a routine activity to prevent sudden premature failure or any machinery problem. Things like lubricants additive concentration, contamination, wear metals & viscosity. In the same way lubricant testing like oil analysis or grease analysis, can tell your soo much about the health of machinery like engines, compressors, turbines, gearboxes, pumps & all other application where lubricants are used to reduce friction.īecause lubricant is the lifeblood of machinery, if something unusual happening in the system or application, it will show in the lubricant & can detect the issue with proper lubricant testing. Have you ever visited a doctor & doctor asks you to have a blood test done? Doctors do that usually because blood tests can tell a lot more about your health. Different Lubricant Testing Procedures & Its Importance
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