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It's not only psi, it's also volume. :thumbsup:
 

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94 Daily Driven 4.6L said:
It's not only psi, it's also volume. :thumbsup:
LOL I'm sure there's a bad joke in there somewher, but I'll let it go! ;)

Basically if the air tool is a high speed type tool (for example a sander, or grinder) its going to require a lot of air volume to use effectively. A small tank will require that the pump run nonstop just trying to keep up with the air being used. Other tools such as an Impact wrench rely more on pressure than volume. I actually used the Sears catalog to learn a lot, as they have charts to indicate what tools require so many gallon tanks.
 

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You have to look at CFM ratings at the different pressures and SCFM ratings. Most things won't require more than 90 psi, but things like sand blasting require significant sustained CFM that most consumer mobile compressors can't touch.
 
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