Diaphragm dryer for compressed air

The Skillair air service equipment has been expanded to include diaphragm dryers which are used to reduce compressed air’s moisture content by lowering the dewpoint ie, the temperature at which condensate starts to form.

This modular unit typically includes a 5 µm filter, depurator (coalescing filter) and the dryer.

The drying element comprises cross-fibre diaphragms around an inner tube. Compressed air passes through the tube and flows back through the hollow diaphragms. Regenerated air required for the drying is tapped from the outlet port, expands as it passes through a nozzle, which reduces the relative humidity. This results in water passing from the compressed air which is then discharged through holes in the bottom of the dryer.

The advantages are claimed to be: guaranteed drying; reduced dryer maintenance as none of the components are subject to wear; and environmentally friendly drying process.