sandblasting question
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Senior User
Joined: Jan 2005
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sandblasting question
i have a 40 gallon 5 hp 7.1 cfm at40 psi and 5.7 cfm at 90 psi compressor that runs on 110 and i'm going to buy a pressure sandblaster soon .i just need to know if my compressor will run the sandblaster. in the catalog it says the blaster uses6-25 cfm at 85- 125 psi. i can either buy a 5 or 10 gallon blaster too.
what problems will i run into if my compressor is too small
what problems will i run into if my compressor is too small
Junior User
Joined: Feb 2005
Posts: 56
Likes: 0
From: Parma Heights, Ohio
sanded by cfm
well i had the same air compresor as you sounds like. i also have a presure blaster. every time i would start blasting that comp. would kick on and never stop, sometimes had to wait for comp. to build air.. now i have a 24 cfm comp. 80 gal tank and i can blast, and the comp still has time to cool down. youll find me at rustbusters 
Cargo Master
Joined: Jul 2000
Posts: 2,281
Likes: 18
From: Northern California
I started with one a bit larger than that and it was ok, not good just ok. Had to stop a lot and let the compressor catch up and had to get a second filter to get rid of the extra water in the line.
I got a second air tank that doubled the volume and that made a nice difference. My compressor is belt driven, so I replaced the 3hp 110 with a 5hp 220 and got 33% overdrive pully and it fills much faster now. Overall it's 100% better now with the extra tank and overdriven pully and 5hp motor.
Tip size on the blaster makes a difference too, smaller tips help it keep up.
I used to get 1sq ft done real fast then had to wait for compressor to catch up, now I can pretty much blast as fast as I want.
You can get an extra tank cheap, just get on of those portable ones and run the line to and from it. It also help to get water out of the lines.
I got a second air tank that doubled the volume and that made a nice difference. My compressor is belt driven, so I replaced the 3hp 110 with a 5hp 220 and got 33% overdrive pully and it fills much faster now. Overall it's 100% better now with the extra tank and overdriven pully and 5hp motor.
Tip size on the blaster makes a difference too, smaller tips help it keep up.
I used to get 1sq ft done real fast then had to wait for compressor to catch up, now I can pretty much blast as fast as I want.
You can get an extra tank cheap, just get on of those portable ones and run the line to and from it. It also help to get water out of the lines.
Posting Guru
Joined: May 2002
Posts: 1,495
Likes: 2
From: Northwest Fl
The smaller tips are much better when the air is marginal and you will likely fall into that category. I ran a 60 gallon 6.5 HP and it ran continuously during my blasting. Be sure to have a good water trap and bleed it off regularly. Adjust your pressure at the nozzle as low as you can get by with, it will help even out the high and the lows you will have to work with.
