Air Compressor question

[bignissan]

what determines the size of pump/motor needed for a certain sized tank? I have a good oiled pump and motor that are belt driven, but need a tank. It's mounted on a 10-11 gallon tank now, but I was wondering if I could go up in size to replace the tank? If not...I'll just buy a CH from Lowe's for $400 for a belt drive 60 gal. Thanks,
Greg

[motrhedx81]

There's probably a happy medium there. I think a lot of it will depend on the power your motor puts out, as to wether it can keep up with the demand of keeping that tank filled. You need to be able to deliver a certain amount of cfm and psi depending on the tools you use. As for specifics, I'm too sure.

[bignissan]

hmm, If I get a 30+ gallon, once the tank is filled, it should be able to keep up decently I would think. I'll check into more.
Greg

[frankenfab]

The CFM that the compressor is capable of providing is the most important factor. The tank only provides for momentary surges. If you are using "surge" devices, such as impact guns or air ratchets, a large tank will help. You will get more bursts out of your tool before the compressor kicks on and you have to wait for the pressure to build back up. For continuous demand tools, like sand blasters or paint guns, you need a large compressor. Get the biggest you can afford.

Excellent info here:

http://www.practicalmachinist.com/ub...ML/000039.html

I just finished rebuilding my compressor. 17.6 CFM at 120 psi. It's a 3 cylinder, 2 stage. The first 2 cylinders feed the 3rd, which compresses the air a second time.

[bignissan]

thanks!