A compressed air dryer is used for removing water vapor from compressed air. Compressed air dryers are commonly found in a wide range of industrial and commercial facilities.

The process of air compression concentrates atmospheric contaminants, including water vapor. This raises the dew point of the compressed air relative to free atmospheric air and leads to condensation within pipes as the compressed air cools downstream of the compressor.

Excessive water in compressed air, in either the liquid or vapor phase, can cause a variety of operational problems for users of compressed air. These include freezing of outdoor air lines, corrosion in piping and equipment, malfunctioning of pneumatic process control instruments, fouling of processes and products, and more.

There are various types of compressed air dryers. Their performance characteristics are typically defined by the dew point.

• Refrigerated dryers => 3 to 10 degC
• Membrane dryers => 0 to -40 degC
• Desiccant dryer => -20 to -70 degC

Water vapor is removed from compressed air to prevent condensation from occurring and to prevent moisture from interfering in sensitive industrial processes.

Compressed air filters, often referred to as line filters, are used to remove contaminates from compressed air after compression has taken place.

Unfiltered compressed air frequently contains dust, oil, rust, moisture and other harmful substances, and therefore requires filtration.

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