I'm sure a lot of people get caught out by these sneaky tricks. If the compressor specs mention a "piston or pump" displacement figure you should knock 23% to 28% off that figure to reveal the real CFM. Eg, piston or pump rating is 300L/pm - 25% = 225L/pm.. So the claim of 10.59 CFM iin reality is 7.7 CFM..
You're missing the biggest part of the point, though. Actually, there are several points. Point #1 is that the manufacturer claims are always about intake (at 1 atm) CFM, which is very different from output (at 10 atm) CFM, which is the only truly useful number because that number is what all your air-consuming equipment will specify for a requirement. "Requires 4 CFM at 100 PSI" means exactly that - output CFM... which is pretty much expected to be about 10% of the compressor's own rated CFM. If you (ideally) keep your compressor working 100% of the time (at least during working hours), then you need a compressor that is rated TEN TIMES as high as the total CFM requirement count of the equipment you need to run concurrently. Point #2 is related... if you aren't involved in industry, if you're just a small dog behind a small fence, then you won't be running your compressor anything near to 100% of the time... and you can tolerate "duty cycle". You can use the tank as a pressure accumulator, and work out of the tank while the compressor tries to keep the tank from draining down too quickly. You may have a 10 CFM requirement but be able to use a 1 CFM compressor that has a large tank... simply because you don't use the compressor continuously and you can afford to wait for the tank to refill.
For some one looking to sand blast / soda blast and do some painting projects for my motor bikes and cars here and there, what sort of compressor or cfm rating should I be going for? As I’m under the impression that for good power I need a cfm rating of 18-25 for a satisfying quick job for sand blasting etc..
@@1996serg That would depend entirely upon the scale you're shooting for. What size nozzle? What size grit? How dense of a mix? How fast do you need it to work? If you're hoping to blast a whole car to bare metal with second-use media and you aren't planning to be there all week, you're going to need a very large compressor. If you're hoping to blow a little airbrushing off a motorbike fuel tank with fresh garnet media, you could get by with a little pancake compressor and a tiny blasting rig. Really, it comes down to the question of how much compressor you can budget for. You'll never be sorry you bought too much compressor, but it's easy to be sorry for not having bought a bigger one. Also... what do you have available for electric power? 120V? 240V? Single-phase? 3-phase? How much current are you prepared to route to the compressor? Are you ready to have an electrician bring in a much heavier circuit than you already have?
Ive got the small unit that was distributed by Wolfe. Wolfe claimed 14CFM. The Motor pulled 14Amps and was giving 9.6CFM. I have converted it to Petrol because i couldn't fit a bigger Motor due to power restrictions. I am now getting 15.23 CFM with pump running at 1395 rpm. ruclips.net/video/LiM441iSOpM/видео.html
Hi, thanks for the explanation. Could you please tell me how long your 3hp 100l compressor takes to fill up from 8 to 10 bar? Because I have a Fiac AB100-360 compressor with a 100l tank and a 3hp single-phase motor. The air displacement listed is 350l/min and the FAD 260l/min (approx. 9 cfm). Now, I don't think any one of these values is accurate because it takes 60s to charge from 8 to 10 bar. This translates to 200l/min FAD according to my calculation bellow: - 100l @ 8 bar equals 900l at atmospheric pressure - 100l @10 bar equals 1100l at atmospheric pressure The difference is 200l of air at atmospheric pressure delivered in 60s (or 1 min), not 260l like it states on the compressor. Do you think this is correct? How long does your 3hp 100l compressor take to fill up from 8 to 10 bar?
great video, what specs should i look for to run a sand blasting gun? ( small projects like motorbike engine / frames). i dont want anything over kill as it wouldnt get the use.
Hello, I've noticed when looking into an ew compressor the direct drive just state cfm but the belt driven ones in most cases state cfm and fad, is a direct drive compressor actually giving you a higher fad as they say up to 14.6 cfm on a 100l 3 hp.
This is what people should look at when buying
I'm sure a lot of people get caught out by these sneaky tricks. If the compressor specs mention a "piston or pump" displacement figure you should knock 23% to 28% off that figure to reveal the real CFM. Eg, piston or pump rating is 300L/pm - 25% = 225L/pm.. So the claim of 10.59 CFM iin reality is 7.7 CFM..
You're missing the biggest part of the point, though. Actually, there are several points.
Point #1 is that the manufacturer claims are always about intake (at 1 atm) CFM, which is very different from output (at 10 atm) CFM, which is the only truly useful number because that number is what all your air-consuming equipment will specify for a requirement. "Requires 4 CFM at 100 PSI" means exactly that - output CFM... which is pretty much expected to be about 10% of the compressor's own rated CFM. If you (ideally) keep your compressor working 100% of the time (at least during working hours), then you need a compressor that is rated TEN TIMES as high as the total CFM requirement count of the equipment you need to run concurrently.
Point #2 is related... if you aren't involved in industry, if you're just a small dog behind a small fence, then you won't be running your compressor anything near to 100% of the time... and you can tolerate "duty cycle". You can use the tank as a pressure accumulator, and work out of the tank while the compressor tries to keep the tank from draining down too quickly. You may have a 10 CFM requirement but be able to use a 1 CFM compressor that has a large tank... simply because you don't use the compressor continuously and you can afford to wait for the tank to refill.
For some one looking to sand blast / soda blast and do some painting projects for my motor bikes and cars here and there, what sort of compressor or cfm rating should I be going for? As I’m under the impression that for good power I need a cfm rating of 18-25 for a satisfying quick job for sand blasting etc..
@@1996serg That would depend entirely upon the scale you're shooting for. What size nozzle? What size grit? How dense of a mix? How fast do you need it to work? If you're hoping to blast a whole car to bare metal with second-use media and you aren't planning to be there all week, you're going to need a very large compressor. If you're hoping to blow a little airbrushing off a motorbike fuel tank with fresh garnet media, you could get by with a little pancake compressor and a tiny blasting rig.
Really, it comes down to the question of how much compressor you can budget for. You'll never be sorry you bought too much compressor, but it's easy to be sorry for not having bought a bigger one.
Also... what do you have available for electric power? 120V? 240V? Single-phase? 3-phase? How much current are you prepared to route to the compressor? Are you ready to have an electrician bring in a much heavier circuit than you already have?
Ive got the small unit that was distributed by Wolfe. Wolfe claimed 14CFM. The Motor pulled 14Amps and was giving 9.6CFM.
I have converted it to Petrol because i couldn't fit a bigger Motor due to power restrictions.
I am now getting 15.23 CFM with pump running at 1395 rpm.
ruclips.net/video/LiM441iSOpM/видео.html
Hi, thanks for the explanation. Could you please tell me how long your 3hp 100l compressor takes to fill up from 8 to 10 bar?
Because I have a Fiac AB100-360 compressor with a 100l tank and a 3hp single-phase motor. The air displacement listed is 350l/min and the FAD 260l/min (approx. 9 cfm). Now, I don't think any one of these values is accurate because it takes 60s to charge from 8 to 10 bar. This translates to 200l/min FAD according to my calculation bellow:
- 100l @ 8 bar equals 900l at atmospheric pressure
- 100l @10 bar equals 1100l at atmospheric pressure
The difference is 200l of air at atmospheric pressure delivered in 60s (or 1 min), not 260l like it states on the compressor. Do you think this is correct? How long does your 3hp 100l compressor take to fill up from 8 to 10 bar?
GLOG1221 glog hi , do be honest I don’t know, but I will look into this a report back
@@Compressors.online5421 Thank you very much!
GLOG1221 glog hi
Our Ng2 3hp 100 ltr tank compressor takes 3 minutes to reach 100 psi and a total of 5 minutes to reach from 0-150psi
Myslim ze plnenie kompresora je nelinearny dej.
I want to buy a compressor. After all my research the problem now is how do I know the strength/ thickness of the tanks?
Not really a worry, if it has a CE mark and certificate
great video, what specs should i look for to run a sand blasting gun? ( small projects like motorbike engine / frames). i dont want anything over kill as it wouldnt get the use.
look at the volume of air required for gun, then match + 10%
So how do you work out free air delivered? Not one spec I’ve read quotes FAD
Rule of Thumb, take off 1/3rd and yo will be very close to F.A.D
@@Compressors.online5421 ooo thanks for this!
Hello, I've noticed when looking into an ew compressor the direct drive just state cfm but the belt driven ones in most cases state cfm and fad, is a direct drive compressor actually giving you a higher fad as they say up to 14.6 cfm on a 100l 3 hp.
Hi
They will be less, this is why most don’t state fad