Air compressor question

[Marbarger farms]

Hi all, I have the chance to buy an portable vertical air compressor, was wondering for input.

The compressor is a campbell hausfeld iron force, 6.25 hp, 28 gallon. It has 150 max psi.

I know you dont judge a compressor soley on those numbers. Its the cfms right?



So my question is can anyone tell me what kind of cfm this compressor is capable of putting out?

The main use would be a 1/2" impact gun.

Waste of money or good compressor?

 

[Gun guru]

Normally an air compressor (piston type) will put out 3.6 cfm per horsepower at 100 psi. So you should be able to get about 20cfm. That is plenty for home shop use. An industrial rotary screw type compressor will put out about 4.2 cfm per HP. But...a rotary screw compressor that is 5hp costs about double or more then double the cost of a piston style, but then they last longer and cost less to operate.

 

[Dusty MI]

You say 3.6 cfm per hp. Is that hp at maximum full load for 8 hours as defined by the National Electrical Code, or is that the inflated one, maximum power out put just before the motor stalls?

Dusty

 

[rustyfarmall]

(quoted from post at 13:11:11 04/06/10) Normally an air compressor (piston type) will put out 3.6 cfm per horsepower at 100 psi. So you should be able to get about 20cfm. That is plenty for home shop use. An industrial rotary screw type compressor will put out about 4.2 cfm per HP. But...a rotary screw compressor that is 5hp costs about double or more then double the cost of a piston style, but then they last longer and cost less to operate.

You may be correct, but I strongly doubt that a Campbell-Hausfeld compressor is putting out 6 horsepower, even though that is what it is rated.

I'm thinking the actual CFM of that compressor will be closer to 10 or 11, but you'll never know until you look at the tag.

 

[Gun guru]

I am assuming that Mr. Marberger Farms is speaking of an upright compressor with a 6.5HP electric motor on a 30 gallon receiver tank.
I judge HP (in electric terms) as 746 watts per HP, so total watts would be 746 * 6.5, I am also assuming that this is a 220 VAC single phase motor.

As far as "rating" the motor, put a set of amp leads on the motor and see what it draws.

 

[Marbarger farms]

Hey guys, thanks for the responses. I called a local business, who can give me a good deal on a 80 gallon IR. I believe im going to go that route.

Once again thank you for your responses!

 

[Gary in da UP]

Campbell Hausfield compessors are not rated like the others . Look at the startup amperage, the service factor, duty cycle . CFM are rated at differant PSI with differant manufacturers and whether a compressor is a single or two stage. Use that information to draw your own conclusions . They are a Walmart grade of tool.

 

[Dean]

I would advise that you check out Eaton Compressor before buying a compressor.

I researched compressors about three months ago before buying a 7.5 HP (running) V4 compressor outfit from Eaton. I found that I was able to buy much more performance for the money from Eaton.

The unit uses a 4 pole 1760 RPM motor driving a 10 HP rated pump at 640 RPM. It is so quiet that one can converse with another beside it while it is running. You do not want a 2 pole 3200 RPM motor driving a pump at high speed.

Dean
Eaton Compressor

 

[markiz41]

Wise decision. Bigger is better. And I'll bet the farm that portable unit hp is grossly overated.

 

[greygoat]

I would call "Campbell-Hausfeld', AND 'Coleman"
products, Dime store stuff..the kind of product
my Son in law would buy.

 

[ohio]

I looked into them before buying. They are chi-com.

 

[36 Coupe]

You will have a hard time finding a compressor that dosent have some import parts in it.Prices vary a lot so have paper and pencil when shopping for a comppressor.

 

[Sidekick]

No way is that compressor 20 cfm. Probably more like ten at the most. It will run an impact just fine. Don't knock the Eaton. I bought one three years ago and it's been just fine. The most compressor for your money and they stand behind their product. Horsepower ratings are almost meaningless when judging air compressors.