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Coalescing Filtration

Compressed Air
Clean compressed air is essential in such industries as food processing, electronics, health care, photography, dairy and instrumentation. Compressed air and other gases are widely used to convey materials, provide and control energy and protect equipment or personnel. Clean air in these and other critical applications must be free of both solid particulate contamination and liquid aerosols. These oil and water aerosols are beyond the control of conventional filter systems and can only be removed with coalescing filters.

Water, oil and solids are your three contaminant threats.
The contaminants of greatest concern in precision compressed air systems are water, oil and solids. Water vapor is present in all compressed air; it becomes greatly concentrated by the compression process. In fact, compressed air is saturated with water until it is dried. A 25 hp compressor delivering 100 standard cubic feet of air per minute (SCFM) at 100 PSIG can produce 18 gallons of water per day. Water aerosols in compressed air range from 0.05 to 10 µm . While air dryer systems can be used effectively to remove water from compressed air, they will not remove the second major liquid contaminant – oil.
Oil is also present in compressed air systems. It is largely introduced into the air stream by the air compressor. The amount of oil introduced in this fashion varies by the type of compressor used. Estimates of the hydrocarbon content of discharge air from typical compressors are expressed in parts per million (ppm):• Screw – 25 to 75 ppm at 200°F. • Reciprocating – 5 to 50 ppm at 350°F. • Centrifugal – 5 to 15 ppm at 300°F. At a concentration of 25 ppm, a typical compressor flowing 100 SCFM for 35 hours will introduce eight ounces of oil into the pneumatic system. Even if an oil-less compressor is used, oil contamination of the air stream remains a problem because ambient air contains 20-30 ppm of hydrocarbon aerosols from industrial and automotive sources. Oil-less compressors can condense approximately 10 ppm of hydrocarbons during the compression cycle. This is enough oil to gum-up air line components and to collect in air dryer systems. A majority of the oil aerosols emitted by air compressors are 2 µm and smaller.
The third contaminant found in compressed air is solid matter including rust and scale. Solid particulates, combined with aerosol water and oil, can clog and shorten the life of air system components as well as filter systems. Most rust and scale contaminants typically found in compressed air systems are 0.5 to 5 µm in size