Industry dynamics
The service life of screw air compressor oil should be the minimum service life under normal working conditions. It is difficult to accurately determine the service life of lubricating oil, and the regulations of various manufacturers are also different. The general regulations are: 2000 hours for Class I mineral oil, 4000 hours for Class II mineral oil (later reduced to 2000) hours, and 6000 hours for Class III mineral oil (later reduced to 4000) hours, PAO can reach 8000 (also considered to be 6000) hours, polyol ester can reach 12000 (also considered to be 8000) hours.
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The necessity of compressor oil change
Compressor oil is subjected to heating, oxidation, high-speed shearing, dust pollution and harmful gases during use. Oxygen reacts with the hydrocarbons in the lubricating oil, causing the oil to slowly oxidize, turn black in color, and increase in viscosity. Finally, it may be serious enough that the oxide cannot be dissolved in the oil, but is deposited in a brown mucus layer somewhere in the system. It is easy to block the control oil passage in the component, aggravate the friction of the ball bearing, the valve core, etc., and affect the normal operation of the system. Oxidation also produces corrosion and acidification. The oxidation process starts slowly, the accumulated sediment and acid value increase, and the viscosity increases. To a certain extent, the oil should be changed. Otherwise, the oxidation will continue, the oxidation rate will gradually accelerate, and the viscosity will rise, resulting in an increase in the working oil temperature. As the oxidation continues to intensify, the viscosity of the compressor oil tends to increase significantly. When the rate of oxidation changes from linear to square curve, the viscosity rises faster, and there may be results that people do not want to see.
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