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Compressor CFM

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andrew

10-14-2001 08:03:06




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How do you estimate the CFM your compressor is putting out? I got a old compressor at a auction and am wondering what it will power.It has a 6 gallon tank I think and the working pressure of it is 175psi. right now I am using it to fill tires, Thanks
Andrew




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picture

10-18-2001 19:45:46




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 Re: compressor CFM in reply to andrew, 10-14-2001 08:03:06  
here is a picture of my compressor



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Neil

10-16-2001 06:24:00




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 Re: compressor CFM in reply to andrew, 10-14-2001 08:03:06  
Sounds like you have something near a 25 to 30 gal tank.
Try to find the mfg and model of the pump. From that you should be able to get a chart to show CFM at a given RPM.
If you measure the tank acuuratly, you can use simple math to get the volume. Fix ALL the leaks, then time it from 85 PSI to 115 PSI. During that period the pump has pumped aproximatly 2 times the tank volume against aproximatly 100PSI. This will give you a good indication of the actual CFM under working conditions.

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shannon

10-14-2001 21:58:37




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 Re: compressor CFM in reply to andrew, 10-14-2001 08:03:06  
judging by volume of tank and time it takes to fill is pretty close but does not take into account the air mass differences between atmorispheric air and tank air due to temperature variation. cfm will vary with pressure. to get the cfm at atmorspheric pressure (760mmhg (12.5 psi?)...sorry dont have calculator handy) find the volume of the cylinder (stroke*bore*bore*pi/4...all measured in inches) and multiply by the rpm of compressor then divide by 144. cfm is inversly porportional to pressure so if you double the pressure you halve the cfm.

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Andrew

10-14-2001 09:42:42




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 Re: compressor CFM in reply to andrew, 10-14-2001 08:03:06  
here are some #'s I got off the tank and engine. The engine was made by master electric co. in dayton ohio. The tank was made by tanks inc. and says HSB co. no. 162222 and ASME W UW52B
Andrew



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Fred OH

10-17-2001 06:37:43




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 Re: Re: compressor CFM in reply to Andrew, 10-14-2001 09:42:42  
I have one that a buddy said the HSB was part of his company and stood for Hartford Steam Boiler and was the outfit that tested it. He worked for Hartford Insurance Co. L8R----Fred OH



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andrew

10-17-2001 15:48:58




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 Re: Re: Re: compressor CFM in reply to Fred OH, 10-17-2001 06:37:43  
That must be the test number then...thats interesting



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Neil

10-14-2001 14:58:44




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 Re: Re: compressor CFM in reply to Andrew, 10-14-2001 09:42:42  
If it is working well you can expect about 4CFM at 100PSI per HP.
You can estimate the HP by the current it draws.
1 HP = 746 Watts (aproximatly).
a six gallon tank compressor is fairly small, So I would guess it wil not be that big a pump and motor.



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Andrew

10-14-2001 15:16:19




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 Re: Re: Re: compressor CFM in reply to Neil, 10-14-2001 14:58:44  
The motor seems pretty big, The pump cyliner seems kind of small though. the cylinder is about 8in tall but the bore is only 2 or maybe three inches. is there any way to figure it out by timing how long it takes for the tank to fill? I am not sure if it is 6gal, it is about 2.5 feet long and about a foot and a half wide.
Andrew



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Cliff Neubauer

10-14-2001 16:37:13




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 Re: Re: Re: Re: compressor CFM in reply to Andrew, 10-14-2001 15:16:19  
Volume of air in the tank will double every 14.9 psi (one bar), if it is a six gallon tank it would be just under a square foot. Start the compressor up and time how long it takes to gain 15psi. If it takes ten seconds then it would be about 6 cfm, if it takes a minute it would be 1 cfm. This won't be exact but it should get you close.



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Andrew

10-14-2001 20:06:23




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 Re: Re: Re: Re: Re: compressor CFM in reply to Cliff Neubauer, 10-14-2001 16:37:13  
$#%$ must be losing my math :-) after figuring it out the right way I found out I have a 9 gal tank, so it is taking it 25sec to fill it to 15psi. There is a large air leak at one of the fittings so I could fix that and bump up the performance a little.
Andrew



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Andrew

10-14-2001 19:37:03




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 Re: Re: Re: Re: Re: compressor CFM in reply to Cliff Neubauer, 10-14-2001 16:37:13  
I had someone tell me it is around a 12 gallon tank



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Andrew

10-14-2001 18:45:28




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 Re: Re: Re: Re: Re: compressor CFM in reply to Cliff Neubauer, 10-14-2001 16:37:13  
I started it up and it took 25 seconds. I think I can cut down on the time if I tighten some of the joints that are leaking. I am not sure if it is actually 6 gal, it is 6.28 cubit feet. and also the needle seemed to jump up to 15psi so I don't know if it is that accurate....
Andrew



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