Compressed Air Dryer
882.03168.00
2/13/2023
15
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
