Why do I need an aftercooler?

Aftercoolers provide dry air and thus prevent blockages in the blastpot.

The air from the compressor is hot and contains a lot of moisture in the form of vapour. The air will cool off in hoses and inside the blastpot because the ambient air temperature is significantly lower. When the air cools off, the vapour will condense and form water drops. This makes the abrasive clog together which causes blockages in the blastpot. Also (control) valves of the machine suffer from wet air.
Wet compressed air can also affect the blasting result. It can leave a nasty residue on the blasted object which can cause e.g. painting failures.

Cooling first!

The only way to get moisture out of the compressed air is to cool it off first. An aftercooler cools the compressed air to approximately 9°C above ambient temperature. This temperature drop causes the water to condense and form drops. These drops are then removed by the centrifugal separator which is part of the aftercooler. Oil and other contaminants can optionally be removed in a second stage by compressed air filters.
Note that separators and filters alone cannot dry compressed air as long as the water is still in vapour form and not in drops. Cooling first is absolutely essential!

An aftercooler is crucial for fault-free performance of blasting equipment as well as for other compressed air tools. Only dry air will provide a smooth, continuous abrasive flow, significantly less breakdowns, maintenance and repairs. Gritco manufactures a wide range of aftercoolers for all compressor capacities and blasting applications.