Abrasive Blasting 101
External abrasive storage in abrasive blast cabinets refers to situations where abrasive is stored outside of the blast cabinet. In a direct pressure abrasive delivery system where a pressure pot and the external abrasive storage are used, all the abrasive is removed from inside the cabinet each time it exits the nozzle which allows the use of many different pressure pot sizes. Because the pot is sealed when blasting, it must stop blasting to refill the pot. As you can imagine, running more than one nozzle on any pressure pot means the pot empties faster. When the pot is filled again and re-pressurizing, operation downtime brings production to a standstill. This is why most automated machines use siphon delivery that uses no pressure pot assembly.
The item used to remove the abrasive from the cabinet is normally a pneumatic conveyor and cyclone separator reclaimer. These remove the abrasive, separate the dust from the abrasive and recycle the abrasive over and over without loss of abrasive. The cyclone is the most efficient mechanical separator reclaimer available today and when built correctly is a pneumatic dry centrifuge.
Given the list above, you may be wondering why anyone would use anything besides direct pressure with external abrasive storage. Well, unless you have an application that requires direct pressure using external abrasive storage the siphon delivery cabinet, open to atmosphere that doesn’t need to stop and refill a pressure pot every 15 minutes, is faster at the end of the day.
When the model application requires direct pressure delivery with external abrasive storage this Media Blast machines are ideal solutions. Keep in mind, if you use a machine model incorrectly the equipment will have a higher cost, increased maintenance and another machine model will have a higher daily production output. Using a direct pressure machine with pneumatic conveyor incorrectly can make some manufactures that only offer pneumatic conveyors very happy with the replacement parts business.