Machinery Lubrication

Machinery Lubrication March-April 2020

Machinery Lubrication magazine published by Noria Corporation

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ML type of strain the lubricant may be subjected to while in service. Typically, lubricant stressors in compressors include moisture, extreme heat, compressed gas and air, metal particles, gas solubility, and hot discharge surfaces. Keep in mind that when gas is compressed, it can have adverse effects on the lubricant and result in a noticeable decline in viscosity along with evaporation, oxidation, carbon depositing and condensation from moisture accumulation. Once you are aware of the key concerns that may be introduced to the lubricant, you can use this information to narrow your selection for an ideal compressor lubricant. Characteristics of a strong candidate lubri- cant would include good oxidation stability, anti-wear and corrosion inhibitor additives, and demulsibility properties. Synthetic base stocks may also perform better in wider temperature ranges. Lubricant Selection Ensuring you have the proper lubricant will be critical in the health of the compressor. e first step is to reference the recommendations from the original equipment manufacturer (OEM). Compressor lubricant viscosities and the internal components being lubricated can vary greatly based on the type of compressor. e manufacturer's suggestions can provide a good starting point. Next, consider the gas being compressed, as it can significantly affect the lubricant. Air compression may lead to issues with elevated lubricant temperatures. Hydrocarbon gases tend to dissolve lubricants and, in turn, grad- ually lower the viscosity. Chemically inert gases such as carbon dioxide and ammonia may react with the lubricant and decrease the viscosity as well as create soaps in the system. Chemically active gases like oxygen, chlorine, sulfur dioxide and hydrogen sulfide can form tacky deposits or become extremely corrosive when too much moisture is in the lubricant. You should also take into account the environment to which the compressor lubricant is subjected. is may include the ambient temperature, operating temperature, surrounding airborne contaminants, whether the compressor is inside and covered or outside and exposed to inclement weather, as well as the industry in which it is employed. ML

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