Centrifugal compressor oil analysis
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Today I came across a set of analysis results related to the oil used in centrifugal compressors. As a layperson in this field, I would like to ask experts to help me analyze these results: The analysis of the lubricating oil in the compressor’s tank showed a water content of 8 ug/ml, mechanical impurities at 0.0009%, and a viscosity of 50 mm2/s. Question 1: What is the standard value for water content? And how does water end up in the oil? Question 2: What are the standards for mechanical impurities and viscosity? Is it better to have high or low viscosity? Thank you!
It is recommended to look up the physical and chemical properties of the lubricant type you are using by referring to its specifications. Compare the parameters according to this indicator. The ways water enters the oil include leaks in the oil cooler, rainwater entering due to improper installation of the exhaust pipes, and water seeping into the fuel tank from the outside. Viscosity is one of the physical properties of this oil; it determines the appropriate type of oil to be selected based on the lubrication requirements of the equipment. During operation, this oil temperature must be kept within a certain range (as specified by the physical and chemical parameters). It is actually also a means of controlling viscosity. As the oil temperature rises, its viscosity decreases; conversely, viscosity increases. The physical and chemical parameters of oils that you need to know can be found online. Just enter the oil product model and name. For reference.
During the operation of the compressor, water can be present in the oil, and there are many other possible reasons for this. I would appreciate your guidance on this matter. I hope that questions 1 and 2 can be discussed in conjunction with actual operational conditions. Thank you.