Pressure pot sandblaster

Purchased a budget 100# pressure pot sandblaster and a blasting cabinet. Having problems picking up the media.
I'm using a 5hp compressor delivering 12 cfm.
Any suggestions?
Should I install a dryer on the air line?
 
I have a dryer on mine, but not sure if I need it or not. I make sure to drain the compressor tank, before using it! I bought a galvanized garbage can, with lid, to store the sand in. It keeps it clean and dry, cause I have had paper sacks tear and spill sand all over the floor.
 
Who knows? are you having moisture problems? First dump the tank to check for wet sand, if not then check for junk left in the tank when made and for paper from sand bags. Unless you are running a 1/4" or large nozzle eventually you will screen/sift what goes into the blaster or throw it in the scrap pile, yup you will. If you are having moisture problems then one of the small filter dryers stuck in the air line will do virtually nothing to fix them. The air need to be cooled so the water condenses and the speed of travel slowed down so it can settle out and none of this happens with the little water traps sold at the local hardware outlet. The air driers that work all the time in all conditions are very expensive. On the cheap you can buy a 100' of hose and coil it in a 55 gallon drum of cool water 1/2" is best depends on how many CFM you are using but for certain the more hose, the bigger diameter and the cooler the water the better it works, AFter that you need to run the air into an old compressor tank again the bigger the better with the inlet as far away from the oulet as you can get it. The tank is to slow the air down enough for the condensed water to drop out. Even then you will have troubles on humid days. I have settled upon the best solution on the cheap is to delay such work until winter when the humidity is very low.
Past moisture being your problem a pressure pot absolutely does not like being starved for air and will not work properly if it is. To test for this throttle the air going to the bottom and out the hose but not to the top of the sand tank, usually there is valve to do this. What you are doing is artificially causing a bigger pressure differential between the sand tank and output hose. If closing down the air causes the sand to feed then you are starving the unit for CFMs. If you can blast decently with it throttled then leave it alone otherwise the fixes could be, larger air hose feeding it, larger compressor, smaller nozzle.
 
Air dryer is almost a must have thing with sand since if it get wet at all it will not move by air. Also if it has a shut off at the bottom of the tank those love to clog up. I had to remove the shut off on the bottom of my tank or it would not work and I have a compressor form a gas station so it is big and has a big tank
 
I run a 50' length of 1/2" air hose out of the compressor with a filter mounted on the pressure pot and haven't had any trouble with moisture. If you have the filter right at the compressor, the air is still too hot and you won't get all the moisture out.
 
You bet I have a dryer. Dry sand just hates water. Nice long hose with a big dryer and keep up with the old empty it so often deal. Actualy it is best to have that little valve just hiss a tiny bit. It will blow out the water as it gathers.
 

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