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10 CFM Compressed Air Dryer Chapter 2: Functional Description 10 of 30
2-7 Remote Membrane Dryer for Low-Dew point Operation
(Optional)
Membrane dryers take a small percentage of the dried gas and direct it back in a sweeping
pattern through the module shell. This provides a driving force to remove the moisture with
the minimum purge required.
The moisture vent membrane dryer consists of thousands of hollow-fiber membranes made of
tough temperature and pressure-resistant plastic. The inside surface of these hollow fibers is
coated with an ultra-thin layer of a second plastic that actually separates the water vapor from
the air. This second coating allows air to pass through it over 20,000 times easier than it
allows water to pass. As a result, moisture is expelled rapidly with very little air loss. Two-
stage drying provides the option of using the moisture vent directly at the point-of-use in
combination with refrigerated air dryer.
As a single stage unit, the dryer provides consistent performance from 60ºF to –20ºF outlet
dew point. When combined with a refrigerated air dryer, the moisture vent system will
suppress or reduce the inlet pressure dew point to below –40ºF with very low sweep
requirements.
Figure 1: Remote-Mount Membrane Dryer Airflow Schematic
Water
Air
Purge
Dry Air
Humid Air
Dry Air