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Tool Talk Discussion Forum

Air Compressor Capabilities-How Much CFM Needed?

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DRL

01-05-2008 16:22:32




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Been shopping around looking for a replacement for my little loud buzzer compressor. Looking real closely at a two stage 6hp. 26cfm 80 gallon compressor. I know that it will more than do the job for most of what I want to do, however, I would like to know what your experience has been sandblasting with a pressure pot using a similar compressor. In the past, the only thing that gave satisfactory results was borrowing a friends industrial diesel driven compressor with around 120 cfm. That could still be an option, but really hate to rely on and use other's equipment. For around the same price, are there compressors available that have higher than 26 cfm? This was the highest I had found so far. Sorry if this subject had already been cussed and discussed before. I've been watching this board and others for a while, and while the topic had been tossed around, really hadn't seen the answers I was looking for. Thanks for any help you might have.

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Charles (in GA)

01-05-2008 22:20:35




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 Re: Air Compressor Capabilities-How Much CFM Needed? in reply to DRL, 01-05-2008 16:22:32  
The compressor keeps up, pumps up, shuts off and then after a very short while, it comes back on, all while I'm blasting steadily. I let it do this a half dozen times and stop to let it cool off.

This is a TP Tools model 970 cabinet with their foot operated gun and the std nozzles for it.

I have a 105 cfm screw compressor, been thinking about getting hose and fittings and hooking it up. I bought it with the intention of getting a sand blast pressure pot (60 gal or so in size) and blasting my log house with ground corn cob media to remove a horrible coat of cheap solid stain the previous owner put on it. Just haven't found a pressure pot hose and gun I can afford.

Charles

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circus

01-05-2008 18:21:27




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 Re: Air Compressor Capabilities-How Much CFM Needed? in reply to DRL, 01-05-2008 16:22:32  
That comp. works well for touch up blasting but for large equipment get something with a 40 hp engine, minimum.
The quoted output may be @ 0 psi. Probably 20 cfm @ 180 psi. Screw comp. are more efficient than 2-stage which are a lot more efficient than 1-stage.



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JMS/.MN

01-05-2008 18:05:58




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 Re: Air Compressor Capabilities-How Much CFM Needed? in reply to DRL, 01-05-2008 16:22:32  
Most maufacturer"s overrate the hp of their units. My 6hp comes out to under 5 when doing the math on the motor nameplate, regarding amp draw at a given voltage. Watts=Amps times volts. About 745 watts = one hp.



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Charles (in GA)

01-05-2008 18:00:15




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 Re: Air Compressor Capabilities-How Much CFM Needed? in reply to DRL, 01-05-2008 16:22:32  
Joe is correct, it takes a 7.5 hp motor to deliver 24 or 25 cfm's. Six horse won't get you close to that.

There are a bunch of two stage, 80 gal, 7.5 hp units on the market. Even the Harbor Freight model is decent, made by Bellair in the Carolinas, mostly from US made parts. I have a Husky made by Campbell-Hausfeld, there are the Ingersoll Rands, Champion, Quincy, Saylor-Beale, and a whole bunch more that I cannot think of.

I have a TP Tools blast cabinet, the 7.5 hp I have is minimal for it, other than that, I could have easily got along with a 5 hp two stage and 18 cfm but the blast cabinet was the deciding factor.

Charles

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DRL

01-05-2008 18:08:53




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 Re: Air Compressor Capabilities-How Much CFM Needed? in reply to Charles (in GA), 01-05-2008 18:00:15  
Looked back over the notes I took, and it was, indeed a 7.5hp motor. Does your compressor keep up with the blast cabinet, or do you blast for one minute and wait five for it to catch up? If it weren't for the fuel prices, I would purchase an industrial engine driven compressor. May get one anyhow. Looks like I'm going to be blasting a lot. Can pick them up pretty reasonable around here if you keep your eye out.

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JoeK(WI)

01-05-2008 17:01:29




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 Re: Air Compressor Capabilities-How Much CFM Needed? in reply to DRL, 01-05-2008 16:22:32  
Somethings wrong with your figures,methinks,don't see any possible way a 6hp compressor will deliver anywhere near 26 cfm.I have true 6hp,80 gal single stage and I believe it's rated at 10.2 cfm at 90psi(avg tool working pressure)



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DRL

01-05-2008 17:11:06




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 Re: Air Compressor Capabilities-How Much CFM Needed? in reply to JoeK(WI), 01-05-2008 17:01:29  
You could very well be correct. I've looked at so many today that I may not have my facts straight. I do know it was rated at 26cfm. Thanks



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JoeK(WI)

01-05-2008 19:49:08




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 Re: Air Compressor Capabilities-How Much CFM Needed? in reply to DRL, 01-05-2008 17:11:06  
"Most"consumer air tools are designed for and req 90psi.Except for sanders(air hogs)and large impact wrenches,I've found that 9-11 cfm is "adequate" for hobby type use and nominal for decent siphon,cabinet or small pressure pot use.One key thing is to use a good regulator and 3/8 feed hose.This extends time by reducing flow to whats needed and at proper pressure.80-90PSI is completely adequate for most jobs and running at 90+psi has almost no benefit and wastes air.
Look at you tools specs and your blasters specs and follow them as to pressure and cfm.I've run a TP cabinet,siphon blaster,and Pro 99er Pot for over 15 yrs and do know a little about blasting.
A lot of newcomers to the field,think blasting is the magic EZ way to go and then are POed when they find that it's nearly as tedious as other methods at times.

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