CFM needed for sand blasting

by Randy Murphy
(Piqua Ohio, USA)

I purchased a Snap-On Pressurized sand blaster, Model Y441 pressurized tank @ 80 psi. It has a 1 inch delivery hose coming out of the tank. I have hooked up the supply line, which is .5 inch copper feed line, with a .5 inch hose. Snap-On rep. said this unit should blow paint off down to metal with no problem. It take me two minutes to get a 1 square ft. area and lots of media. Please help suggset a fix.

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Bill says....

Hello Randy. From your post I understand that you feel that the Snap-On Pressurized sand blaster may be being under-powered by the .5 inch copper supply line versus the 1.0 inch delivery hose.

Am I correct in understanding that the 1.0 inch hose is the media delivery to the blast nozzle, or is that the compressed air supply to the blaster?

Randy, I don't do much blasting, so I don't know if 2 minutes to get 144 sq/inches of metal back down to clean profile is fast or slow.

I do believe that somewhere in the specs for the sandblast unit it should tell you what the compressed air feed flow rate for that blast gun, at 80 PSI is. That's the info that will tell you whether you have enough flow or not.

What's that spec, please? If you can't find it, ask the rep.

The PRESSURE DROP page on this site has a chart to give you some idea of the flow through various sized orifices.

Cheers,

Bill