how to calculate the cfm of the air compressor.

by michael
(guyana )

i need to no how to calculate the cfm of my air compressor and the ratio at which it need to works in correspondence with the psi.

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Michael, the rule of thumb is you get about 4 CFM of compressed air at 90 PSI for each HP of electric motor size.

Please see the sitemap page, under CFM / SCFM / Flow / Pressure Issues for links to pages that provide much more info.

Cheers,

Bill

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CFM & PSI

by Mickey
(Sanford, NC, USA)

Why/how does the CFM increase as PSI decreases and vice versa?
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Mickey, very good question, and one that has been responded to many times on this site.

You could start by reading the pages linked from SCFM in the navigation bar, there is info there about how increasing pressure reduces outflow.

Then, please see the site map page under CFM / SCFM / Flow / Pressure Issues for lots more information.

After reviewing it, if you have a question specific to your air compressor, add it as a comment here.

Cheers,

Bill

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What mini air compressor and air drying

by Hans
(Tucson)

Dear Bill,

I am designing a instrument which requires dry air to operate.

So I find one mini regenerative dryer module to dry the ambient air. But the problem is the mini regenerative dryer requires about 50 PSI to operate, which means I have to boost ambient air pressure from 1 atm to about 50 PSI.

The air flow I need is extremely small (1L/min), so I really do not know which air compressor module should I choose.

I also want the air compressor to be small (about 10*10*10 cm). From your expertise, do you have any suggestion for my applciation?

Regards,

Hans
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Hello Hans... you need to have a chemical dessicant to dry your air, and there are plenty on the market. For more info see the pages on this linked from the sitemap page.

If the dessicant material itself is a problem for your application, you will want to have a filter downstream of the dryer to remove any dessicant blow over.

Really, there are many choices of small air compressors on the market. You have one parameter in size, another in flow capability, another would be what kind of power supply you wish to use, cost of the compressor etc.

Any of my advertisers or the Amazon shop I've since added (see the top of the nav bar) will help you narrow down your choice.

Bill

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