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air comp. theory

B

bfullmer

Member
Guy trying to sell me an air comp with 80 gallon tank and mine now is 60 gallon--if they both have the same cfm how much would it help using an air tool that that eats air faster than the comp can supply it ? air grinder
 
It will only buy you a few more seconds of run time before it depletes the pressure. The only thing a larger tank will do is give the air longer to cool and more moisture drop to the bottom of the tank.

Need to size the CFM of the compressor to your demand, then size the tank to the compressor, depending on the duty cycle, temperature, humidity, etc.
 
Big tank = more storage. No better for continuous like sandblasting, better for intermittent. Also to consider, a 60 gal on a 2 stage running high pressure can have more storage than lower pressure single stage on an 80 gal.

Best improvement I've seen for air grinders is electric replacements. 1/4 hp electric die grinders work about as well as 10 hp compressor running an air one. Same for air drills and air 4" grinders.
 
IMO, a bigger tank won't help if compressor is same size. Air tools are about a efficient as an old steam engine, not very efficient.

When I was younger, I did body work as a hobby. I have a 5 hp 2 stage compressor. Not sure what size the tank is, but compressor would run non-stop with just one pneumatic tool.

I no longer do much body work. I sold all my pneumatic tools and bought variable speed electric sanders, drills, impacts and grinders. They all use very electricity compared the 5 hp compressor. Not to mention much quieter.

One drop of moisture in air line tends to contaminate the surface you are going to paint, fish eyes. I really don't see the need for pneumatic tools. Been there and won't go back.
 
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