Air Compressor Cfm At Different Pressures

Example an air compressor bears a sticker where they claim the air compressor has 4 horsepower hp tank capacity 30 gallons 14 cfm at 90 psi.

Air compressor cfm at different pressures.

Almost all compressor manuals that have compressed air output information provide it at 90 psi and sometimes at 40 psi. Air compressor cfm calculation formula. Knowing the air compressor output at 90 psi output is good since many air tools are rated on their air consumption at that pressure. 14 7 psia 0 psig 68 degrees fahrenheit at 36 percent relative humidity.

Calculating cfm output at various pressure levels for air compressors over the years i have received many requests for information about calculating cfm at different pressures. That s what this page is all about. We discuss with an example and it might be clear. However i found some ways that you can follow to make your compressor a high cfm compressor.

Usually an air compressor is built with a specific cfm rating for a specific pressure like 2 6 cfm at 90 psi. F at sea level with a specific humidity level circumstances far removed from the condition of the air discharging from your compressor. As a measurement cfm will be a smaller number than scfm because cfm values are taken under pressure typically 90 psi so the air volume is small. It s an imperial measurement not a metric measurement.

Scfm refers to standard cubic feet per minute of air and a standard cubic foot of air is at 68 deg. For measuring the pressure coming out of the compressor i use cfm. Cfm tank volume in cubic feet atm of pressure during cycle crank time in the minute. Well we ve got two simple methods on how to increase cfm on air compressor at two different extents.

Let s go and figure them out let s understand air compressor cfm first.