| Compressor [message #170135] |
Fri, 18 May 2012 19:48  |
Luvn737s
Messages: 1106
Registered: June 2007
Karma: 2
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Senior Member |
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I have a cheap 22 gal 120V air compressor that runs pretty much continuously to keep up with air sander, paint gun, etc. I would like to gang together this 22 gal with another 25 gal tank to increase the volume of air available for painting, without buying a bigger volume air compressor. Can 2 tanks be driven off the same pump at a lower pressure, or will this simply guarantee that the pump will burn up trying to do more than it was designed to do? I am trying to avoid biting the bullet for a 240V line into the garage.
Randy
1973 26' Painted Desert
Ahwatukee (Phoenix) AZ
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| Re: Compressor [message #170149 is a reply to message #170135] |
Fri, 18 May 2012 21:32  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Luvn737s wrote on Fri, 18 May 2012 20:48 |
I have a cheap 22 gal 120V air compressor that runs pretty much continuously to keep up with air sander, paint gun, etc. I would like to gang together this 22 gal with another 25 gal tank to increase the volume of air available for painting, without buying a bigger volume air compressor. Can 2 tanks be driven off the same pump at a lower pressure, or will this simply guarantee that the pump will burn up trying to do more than it was designed to do? I am trying to avoid biting the bullet for a 240V line into the garage.
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Randy,
There is so much bad and misinformation out there that I don't know where to start.
The pump is the whole story. If it is not keeping up with the load, there is nothing you can do that will change that. If you add extra tank, all that will happen is that you will be able to run longer until you loose the tool performance. Then, because there is more tank to pump back up, it will be longer until you can get back to the project.
If you lower the pressure, then the pump will actually have more capacity (in CFM) and you may pick up a little working time.
Cheap air compressors are often not very efficient. A good 1Hp compressor will do 5CFM @ 100psi. So, go looking at ratings.
Fact of the matter is that 1.5Hp is about all you can run on a 120V-15A breaker and even that takes a good motor. [746watts/Hp/120v*0.8PF...1Hp~10Amp] But, good motors and good compressors are both not made in China and so are relatively expensive.
If you like doing this sort of thing, go compressor shopping at industrial supplier and see what you can find. I did just that thirty odd years ago and I and still running that compressor today and see no reason I will not be until I have no need for compressed air.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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