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Compressed Air Encyclopedia

Free Air Delivery
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Free air delivery (FAD) is a standardized measure of the capacity of an air compressor.

Free air delivery (FAD) is a standardized measure of the capacity of an air compressor.

To calculate the free air delivery of a compressor firstly the pressure and temperature at the inlet of the compressor are needed. Then the pressure and temperature of the outlet air along with the volume discharged are also measured. The output volume of the air is referenced back to inlet conditions using the Ideal Gas Law.

Free Air Delivery Equation

The value of V1 is the free air delivery of the compressor.

The standard method for measuring free air delivery is given in the Standard ISO 1217, annex C. The CAGI-Pneurop PN2 CPTC 2 standard can also be applied.

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