#Water in oil emulsion free#
Water is in a free state when undissolved globules of water are physically suspended in the oil. Free water is the other state in which water coexists with the oil. This is called the dew point temperature. When the saturated oil experiences a temperature decrease, it reaches a point where water will not condense into a free form. Dissolved water is difficult to control but causes only minimal harm to the machine and oil. If the oil has dissolved all of the water possible at a given temperature, it is saturated. Numerous factors such as viscosity, base stock type and condition, impurities, and additive package determine the volume of water that will be dissolved by the oil.Īdditionally, the dissolved volume is a function of the oil's temperature, thus the humidity is reported as relative humidity (depending on the temperature). When single water molecules are distributed throughout the oil due to the water's chemical attraction to the fluid, it is in a dissolved state. Water coexists with oil in either a dissolved or a free state. Essentially, water represents a real risk to equipment and should be aggressively controlled. Water also promotes oxidation of the oil's base stock, causes rust and corrosion of machine surfaces, and reduces critical, load-bearing film strength. While some additives adsorb to the water and are removed when the water separates from the oil, others are destroyed by water-induced chemical reactions. Moisture, upon contaminating hydraulic and lubricating oils, has a degrading effect to both the lubricant and the machine itself. While the presence of water is often overlooked as the primary root cause of machine problems, excess moisture contamination can lead to premature oil degradation, increased corrosion and increased wear. Water is perhaps the most harmful of all contaminants with the exception of solid particles.
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