Values of … The saturation level is the amount of water that can dissolve in the oil's molecular chemistry and is typically 200 - 300 ppm at 68°F (20°C) for mineral hydraulic oil. But according to bearing manufacturer Timken, with this level of water in the oil, expected bearing life will be only 30% of what it would be if water content was controlled at 100 ppm (0.01%). Figure 2 Effect Of Water Content On Bearing Life –R E Cantley 0 1 10 10 100 1000 Water Content of Oil (PPM) Relative Bearing Life The above equation can be used to study the relationship between the water state (% RH or % of Saturation) and the relative bearing life. This method is typically used for water content specifications. A known amount of sample oil in the test tube is heated and must be shaken the while doing so If there is no cracking, the oil is dry; If there is slightly cracking, the oil having a trace of water When water is dissolved in another medium like oil, a water molecule still absorbs infrared light although the peak might be shifted slightly due to the different environment around that water molecule. Many references cite 1000 ppm (0.1%) as an acceptable water concentration for hydraulic oil. Guide to Measuring Water in Oil | 2 Pure water absorbs infrared light and can be detected by a peak in the infrared spectrum at around 3400 cm-1. The upper limit for straight mineral oil is 1% to 1.5 % and for detergent dispersant oil is 5%. Measuring Water Content in Fluids There are two methods commonly used to express water content in hydraulic and lubrication fluids: The absolute content in ppm expresses the water content in parts per million (ppm) either by weight or volume. Note that if hydraulic oil is cloudy it indicates that a minimum of 200 - 300 ppm of water is present. Water and other Contaminants.
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