Compressed Air Gas Drying

Desiccants are commonly used for drying compressed air. Moisture in a compressed air system can cause serious corrosion and wear of many types of equipment and can cause instruments and controls to malfunction. Drying of instrument air to a dewpoint of -40°F (-40°C) prevents condensation or freeze-up in the instrument control lines. Dry air prevents rusting of the air lines, which produces abrasive impurities and causes excessive wear on tools. Desiccant drying effectively solves these problems, while also removing dirt and oil.

Since the drying and reactivation occurs in separate sealed compartments, solid tower systems are especially effective for dehumidifying compressed air and pressurized process gases. They can be designed to achieve dew-points as low as -60°F (-51°C) over a wide range of capacities.

Drying and cleaning of industrial gases or fuels, such as natural gas, is done before storage underground to ensure that valves and transmission lines do not freeze from condensed moisture during very cold weather. Other gases, such as liquid oxygen, hydrogen, and nitrogen, must also have a high degree of dryness.

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