CFM vs Pressure

by Abhivansh
(Delhi, India)

I have been thru ur site and learnt that increasing pressure means decrease in cfm and vice-versa but it seems there is no direct factor(number) of relation between them, so calculating my requirements against standard available models is difficult. I would like to know if there is a chart / graph available on this site or otherwise that shows the relation between decreasing CFMs with increase in pressure????

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Bill says...

Thank you for visiting the pages on my site, Abhivansh.

An increase in pressure does not necessarily mean a lessening of flow. As long as the flow required is within the capacity of the compressor to produce it, you can increase and / or reduce the downstream pressure with no loss of flow.

When you are dealing with smaller DIY type air compressors, they are low flow to begin with, and they have a capacity reduction when you the pressure is high over when the output pressure is low.

If you have a 200 HP compressor, and you have a downstream application for 50 CFM @ 60 PSI, and then you decide that you need 50 CFM @ 80 PSI, you will not have a lessening of flow at the higher pressure, as the compressor has the capacity to deliver that flow.

Cheers,

Bill