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Compressor

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TMF

08-10-2006 19:14:51

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What's the difference between a regular compressor and a two stage? My 30 gal craftsman is not up to the task for running my small blaster. I might go to a local auction sat. They have quite a few compressors listed.---Thanks Todd

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Rod (NH)

08-11-2006 15:44:11

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Re: Compressor in reply to TMF, 08-10-2006 19:14:51

Hi Todd,

Ditto what Keith said. I'll also add that the two stage units usually run at a lower speed, are generally rated for continuous duty, run a lot cooler and are a little more efficient in power consumption for the same output. They are also typically more expensive but if you can afford it, they are always the better choice for serious work using compressed air. Check out two previous post(s) of mine on the tool forum here for more detail on how cooler operation results in better moisture control.

Rod

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KEB

08-10-2006 20:25:53

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Re: Compressor in reply to TMF, 08-10-2006 19:14:51

Hi, a two stage compressor has two cylinders in series, i.e., it compresses the air partway in one cylinder & then compresses it further in a second, smaller cylinder. This arrangement allows the compressor to reach a higher pressure without a significant increase in torque requirements from the motor driving the air pump. Bringing the tank to a higher pressure also means that more air is stored in the tank, and the compressor cycles less frequently. Look for a compressor with two different size cylinders and a pipe with fins (an intercooler) connecting them.

For what you're doing, the rated output in standard cubic feet per minute (SCFM) at the working pressure of the blaster is more important than the size of the tank. A larger tank will allow higher/longer surge use, but if the compressor itself can't keep up with the air demand it'll run continuously regardless of the size of the tank.

Keith

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