It has been my experience that the tank is essential. I have a 7 1/2 hp rated compressor on a 30 gallon tank. The manufacturers deliberately over rate them for marketing purposes, since there is no way you can run a 7 1/2 hp motor on 110v with a normal circuit. The motor is actually 1 hp according to the code required nameplate, the largest standard 110v motor available.
A more useful rating is cfm/pressure. For instance, mine says 7.5cfm/40psi which does not keep up with my sprayer. I need around 12cfm/40psi for continuous spraying, so my tank empties in about ten minutes because the compressor can't keep up with the demand. A ten minute break for the compressor to recharge is needed, giving me about a 50% work ratio. For small batches that isn't too bad, but with 150 gallons sitting in the tank, it isn't enough.
Spaceman
Greg House wrote:
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I had another idea for a "budget" spray setup. Harbor Freight sells the raw compressor pumps, without motors or tanks (like Item # 93786, 93785). It seems to me that you could rig one of these up with a motor (maybe an electric motor like Item # 3094, or a gasoline engine from a lawn mower or something) so that it just ran continuously while you sprayed. When you needed to mix more morter or take a break, you just shut the engine off. I'm not sure what you'd do with the "excess air" it produced if you didn't have a tank, perhaps the regulator would just dump it? Greg
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