Tech Tips

TECH TIP #28
HOW MANY CFM DOES MY AIR COMPRESSOR DELIVER?!!

This may be one of the most common questions received by our Tech Department.  Whether you are sizing a piping system, an oil removal filter or an air dryer, you'll need to know just how much air your compressor will deliver.

The following formulas provide a simple and accurate way to determine the output capacity of your compressor.

Small Piston Compressors up to 40 HP                                    4.2 CFM/HP
Large Piston Compressors 75 HP and higher                            5.5 CFM/HP
Rotary Screw Compressors operating at 110 PSIG or less          5 CFM/HP
Rotary Screw Compressors operating at 125 PSIG                  4.5 CFM/HP

Example: A 100 HP rotary screw compressor, operating at 105 PSIG will deliver:

5 CFM x 100 HP = 500 CFM (cubic feet / min)
   HP

*Horsepower (HP) used in above formula is motor nameplate HP.

                                 

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