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.

Let s go and figure them out let s understand air compressor cfm first. F at sea level with a specific humidity level circumstances far removed from the condition of the air discharging from your compressor. As you know cfm stands for cubic feet per minute which is the speed of the air that gets into the compressor. 14 7 psia 0 psig 68 degrees fahrenheit at 36 percent relative humidity.

Usually an air compressor is built with a specific cfm rating for a specific pressure like 2 6 cfm at 90 psi. Well we ve got two simple methods on how to increase cfm on air compressor at two different extents. To calculate scfm the air is expanded to a standard condition to take into account the variables of pressure temperature and humidity. We can calculate the cfm.

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 discuss with an example and it might be clear. 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. However i found some ways that you can follow to make your compressor a high cfm compressor.

Almost all compressor manuals that have compressed air output information provide it at 90 psi and sometimes at 40 psi. 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. Air compressor cfm calculation formula. That s what this page is all about.

It s an imperial measurement not a metric measurement.