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Air Receiver Sizing

When specifying a compressed air system for optimum operation and energy efficiency, proper selection of the compressed air receiver tank(s) is one of the most critical decisions one can make. There are several different “rules of thumb” and formulas that will assist you, but finding straightforward guidance that says “use this size air receiver” is difficult if not non-existent.

Air receivers can be used in several different ways in a compressed air system:

A properly sized air receiver acts as a “buffer” and minimizes the effect of dynamic demand side pressure changes, allowing the compressor controls to operate smoothly and consistently. The end result is less energy used, longer component life, and consistency in plant air pressure.

 

Sizing a PRIMARY receiver for general FIXED SPEED APPLICATIONS:

Example: A 100 CFM fixed speed air compressor should have an air receiver between 100-200 gallons sitting next to it. Err on the high side if your budget permits.

Sizing a PRIMARY receiver for general VARIABLE SPEED APPLICATIONS:

Example: a 100 CFM variable speed air compressor should have an air receiver between 200-400 gallons sitting next to it. Err on the high side if your budget permits.

Useful Air Receiver Sizing Formulas (Primary and Secondary):

Use this formula when you have an existing air receiver

and need to know how long you can draw CFM greater than the output of the air compressor, from the receiver, while still maintaining system pressure:

Use this formula to determine what receiver size to use to supply pressure for a given period of time, not allowing the system to drop below a minimum pressure. The demand of air is greater than the CFM output of the air compressor:

P1 – P2

Use this formula to determine how long it will take to recharge an air receiver to P1, after demand goes back to being below CFM output of the air compressor:

Qr – Qc x 14.7

T = Time in minutes

R = Receiver in cubic feet Qr = CFM removed

Qc = Compressor output in CFM

P1 = Maximum air receiver pressure P2 = Minimum air receiver pressure

14.7 = Atmospheric pressure in PSI (sea level)

CUBIC FT to GALLON CONVERSION: 7.48 gallons in a cubic foot

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