Air Compressor Cfm At Different Pressures

Scfm refers to standard cubic feet per minute of air and a standard cubic foot of air is at 68 deg.

Air compressor cfm at different pressures.

Usually an air compressor is built with a specific cfm rating for a specific pressure like 2 6 cfm at 90 psi. To calculate scfm the air is expanded to a standard condition to take into account the variables of pressure temperature and humidity. Let s go and figure them out let s understand air compressor cfm first. That s what this page is all about.

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

For measuring the pressure coming out of the compressor i use cfm. F at sea level with a specific humidity level circumstances far removed from the condition of the air discharging from your compressor. 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. It s an imperial measurement not a metric measurement.

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. Cfm tank volume in cubic feet atm of pressure during cycle crank time in the minute. We discuss with an example and it might be clear. Air compressor cfm calculation formula.

However i found some ways that you can follow to make your compressor a high cfm compressor.