Lubricated rotary screw air compressors mix oil with the intake air to lubricate the compressor's screws. After the air is compressed an air/oil separator separates compressed air from compressor oil. The compressor lubricant collects at the bottom of the separator tank and the compressed air continues to the air receiver. A standard rotary screw separator reduces the lubricant entrained in the compressed air to 2-3 ppm. Under normal operating conditions an oil separator's service life is 4,000 to 6,000 operating hours.
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