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Old 05-09-2005, 09:37 PM
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Different kind of air compressor question

Lets use this as the specs for an air compressor that i may buy... not made my mind up yet...

3.5 horsepower motor (rated)
Air Delivery: 12.8 CFM @ 90 PSI, 14.5 CFM @ 40 PSI
Belt-driven
ASME tank with safety valve
Cast iron cylinder
Stainless steel valves
Automatic stop/start controls
One year warranty
3.5 HP, single stage, 230V, single phase, 15 amp; Maximum pressure: 130 PSI; Oil lubrication; Overall dimensions: 30''L x 22''W x 68''H; Shipping

The question: How far can the air compressor be from the end of the line and put out a safe amount of air to make the tools work. I have a shed out back that is approx. 70-80 feet away from my garage. Could this work and if it will what would I have to do to make it work.

I am thinking of putting it out there to keep the noise out of my main garage.
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Old 05-10-2005, 04:53 AM
302 Z28's Avatar  
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The specs look pretty good. The performance you actually get by locating the compressor 80 feet from your use depends on the size of the air lines you provide from the compressor to your point of use. In your case I would consider 1" or 3/4" to be minimum.

Vince
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Old 05-10-2005, 07:37 AM
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Not sure about LA winters but if I was to do that in Ohio, I would make sure that I buried my line well below frost level(about 3')
Sounds like a winner in my book to keep the noise out of the garage. Eventually I am going to add on to my garage, but until then I will be building an insulated 'closet' to surround my compressor with.
Good Luck
Later,
WEIMER
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Old 05-10-2005, 08:12 AM
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In La. if you buried the lines 3', it would not be frost you would have to worry about, but water. .

Vince
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Old 05-10-2005, 09:11 AM
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I would advise against that compressor. If you need pressures above 90psig you should go with a 2-stage unit and you can't get 12.8cfm @ 90psig from asingle stage unit w/ 3.5hp rated motor. That rating is 'peak ' hp so it is more likely a 3hp motor. About all you can get from a 2-stage unit is 3hp is ~5cfm @ 90psig. A 10hp compressor will get ~10cfm @ 90psig but you need to go to 6hp to 6 1/2hp to get in the 12cfm @ 90psig range. Pressuring air that high in a single stage generates a lot of heat and is really hard on the compressor. It won't last very long.

The 3hp units are good for nail guns, and small air tools. However if you intend to use a die grinder, D/A sander, spray paint gun, or other industrial grade tool, you will need a 2-stage, 10hp compressor minimum.
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Old 05-10-2005, 09:03 PM
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willys36 - I found these specs from Harborfreight on a compressor. I am not sure that is the one I am getting. Just using it as an example. I probably will get the high output air compressor from lowes. It is built by Kobalt and these are the specs from it.
KobaltŪ
7 HP (Peak) 60 Gallon Stationary Oil Lubricated Air Compressor
13.3 SCFM @ 90 psi
12,000 hour pump life
High output cast iron pump design
3-year warranty on cast iron pump

havent made my mind up completly at the moment. Once I get my shed built and garage clean out I will figure out what I can get. Money being the big factor.
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Old 05-10-2005, 10:37 PM
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Any two stage 5hp or larger will keep a shade-tree mechanic turning to the right all day long! 6hp is even better.
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Old 05-11-2005, 12:54 PM
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I don't believe this is a two stage. I will have to double check the ratings next time I goto lowes. It doesn't say on the website and i just remember reading that it said High Output Air Compressor.
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Old 05-12-2005, 09:48 PM
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I have a 6 h.p. 60 gallon, 12.0 cfm, cast iron, etc. I use die grinders, DA's, straight line sanders and spray gun, etc. Its definately enough to keep me aired up most of the time. Most people really dont need a monster air compressor, but they sure wouldn't hurt either. The next size up for me was an 80 gal., but it was $249 more so I got this one, glad I did know.
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Old 05-20-2005, 11:14 AM
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buy it, stick it in your trunk, run a line to a snorkel air cleaner on your carb and your in bussiness!
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