Now we convert the time 37 seconds to minutes like 37/60 is equal to 0.6166 minutes. Now we can convert in atm of pressure during the cycle (20/14.7= 1.36 atm of pressure during the cycle). You need a stopwatch or a mobile and a pen and paper. The difference between cuts in and cuts out is 20 psi and get the crank time 37 seconds. We test and get cuts in 90 psi and cuts out 110 psi. Now you should start the compressor and we measure the time of cuts in and cuts out on the tank gauge. We know 1 cubic foot is equal to 7.48 gallons.
Let’s see.Īt first, we convert the tank capacity gallons to cubic feet. 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. We discuss with an example and it might be clear. Air Compressor CFM Calculation FormulaĬFM= Tank volume in cubic feet * ATM of pressure during cycle* Crank time in the minute
#AIR COMPRESSOR 4 CFM@90PSI HOW TO#
So we discuss how to calculate the CFM of an air compressor? You don’t need to the laboratory for testing the CFM. But in every company’s CFM is not accurate. Every company gives their specification with the CFM. Why we think about the calculation of CFM. Right! Normal cubic feet per minute (NCFM) is mass of air flow in nor conditions such as 14.7 psia, 68℉, and 36% relative humidity. So what is the difference between CFM and ACFM? The different is actual and not actual. Then what is ACFM? Actual Cubic Feet per Minute (ACFM) is a unit of volumetric flow of actual gas in inlet conditions. Right! But CFM is not measured with the specific pressure and temperature. So what is the difference between CFM and SCFM? SCFM measure with the specific pressure and temperature. What is the difference between the name of CFM, SCFM, ACFM, and NCFM? SCFM is the acronym of standard cubic feet per minute which is the measurement of the mass of air flow with specific pressure and temperature. When you see the CFM on the body, some company talked about the SCFM, ACFM, and NCFM.
That means CFM measure the mass, not the volume. But one you have to know, CFM does not mean the compressed volume of air, It means the mass air flowing per minute. 1.1.1 Air Compressor CFM Calculation FormulaĬFM is the acronym of cubic feet per minute which is the measurement of the mass of air flowing to push out from the compressor.
1.1 How CFM is calculated in air compressor?.
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