Posted by Bob Huntress on March 09, 2008 at 01:37:18 from (65.4.218.129):
In Reply to: OT air compressors posted by Lanse on March 08, 2008 at 17:39:32:
I'll share what works for me. I have an Army surplus 5hp two stage compressor on an 80 gallon tank. I don't know what my cfm's are since the data plate is worn away, though I'ld quess it is around 5 or 6. It doesn't have an automatic condensate drain valve. I don't paint, and I only sand on occasion. I usually fill tires and power impact wrenches and air ratchets. It works great. A couple of times, I have even done small sandblasting jobs. If I had to do much sanding, or painting, I would want a slightly larger air pump, and a much larger tank. The smaller the tank, the more often the compresser will start. Since the compressor most overcome inertia each time it starts, as opposed to simply running a little longer to fill a larger tank. This is called "Lock Rotor Amps" or "Start Amps", and can be as much as 6x as high as "Run Amps". I realize that capacitors, and start windings in the motor help to minimize this, but nonetheless. Some compressors have "Unloaders" some do not. Those that do not have unloaders start, not only against the initial inertia, but against the air pressure remaining in the tank, You can see how it is better to have a longer run time filling a larger tank, than more frequent starts with the smaller tank. It is not an issue with my needs, since I don't have the constant demand of sanding, or painting, but if you intend to do much painting and body work, you'll want the largest tank you can get.
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