Which device in a compressed air system is primarily used to remove moisture from the air?

Which device in a compressed air system is primarily used to remove moisture from the air?

• A. Water filter
• B. Air dryer and moisture separator
• C. Pressure regulator
• D. Vibration damper

Answer: (B)

Moisture control in a compressed air system comes from removing water vapor so the air stays dry as it moves through lines and into equipment. The device that accomplishes this best is the air dryer, typically used together with a moisture separator. The dryer lowers the air’s dew point, meaning the water vapor is held in vapor form rather than condensing into liquid as the air cools or passes through adsorbent material. The moisture separator then collects and drains the condensate that does form, keeping the downstream flow dry. This combination explicitly targets dryness and condensate removal, which is why it’s the correct choice. A water filter mainly removes liquid water and particulates, but it isn’t designed to bring the air to a controlled low dew point. A pressure regulator reduces pressure without removing moisture, and a vibration damper addresses mechanical vibration rather than moisture content.

Moisture control in a compressed air system comes from removing water vapor so the air stays dry as it moves through lines and into equipment. The device that accomplishes this best is the air dryer, typically used together with a moisture separator. The dryer lowers the air’s dew point, meaning the water vapor is held in vapor form rather than condensing into liquid as the air cools or passes through adsorbent material. The moisture separator then collects and drains the condensate that does form, keeping the downstream flow dry. This combination explicitly targets dryness and condensate removal, which is why it’s the correct choice.

A water filter mainly removes liquid water and particulates, but it isn’t designed to bring the air to a controlled low dew point. A pressure regulator reduces pressure without removing moisture, and a vibration damper addresses mechanical vibration rather than moisture content.