Machinery Lubrication


Machinery Lubrication magazine published by Noria Corporation

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40 | September - October 2017 | he lubricant is arguably one of the most essential components of a machine, but it also happens to be one of the most vulner- able. Greatly inf luencing this vulnerability is the temperature, which has an inverse correlation to the most important lubricant property — viscosity. By becoming aware of the potential effects that tempera- ture can have on your lubricants, you can better understand how a machine could fail and hopefully prevent future failures. Startup Temperature Star tup temperature is the ambient temperature upon initial star tup of a machine before the lubricant has a chance to reach the operating temperature. During typical operation, the many contributors to heat generation such as friction will cause the temperature to rise and reach an equilibrium with its surroundings, also known as the machine's operating temperature. Knowing a machine's oper- ating temperature is crucial when selecting the appropriate lubricant viscosity, since viscosity has a dependent relationship with the surrounding temperature. Cold Machine Starts The term "cold machine starts" refers to low ambient temperatures that can be detrimental to a machine's operability. The vehicle and mobile equipment indus- tries have long been developing solutions for this challenge of dealing with extreme temperatures, including those in very cold T Benne t t Fi t ch | Nori a Corpor at ioN LESSONS IN LUBRICATION Overcoming the Machine Starts of RISKS COLD V i s c o s i t y COLD STARTUP -20ºC (-4ºF) TO 40ºC (104ºF) NORMAL 40ºC (104ºF) TO 80ºC (176ºF) EXTREME ABOVE 80ºC (176ºF) Monograde (large rate of change) Multigrade High VI (small rate of change) Multigrade High VI (smallest rate of change) VISCOSIT Y TEMPERATURE Lubricant viscosity has a dependent relationship with temperature.

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