Air Compressor Tank Sizing Calculator
Determine required receiver tank capacity in gallons and cubic feet to buffer intermittent peak air tools and prevent rapid motor short-cycling.
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How Compressed Air Receiver Tanks Are Sized
Air receivers act as pneumatic energy accumulators, supplying sudden bursts of high CFM air that exceed the compressor pump’s continuous capacity:
Receiver Volume (cu ft) = [ Time (mins) × (Demand SCFM - Compressor SCFM) × 14.7 PSI ] / Allowable ΔP (PSI)
Receiver Gallons = Receiver Volume (cu ft) × 7.4805 gal/cu ft
Rule of Thumb = 3 to 5 Gallons per Rated CFM of Compressor
The Short-Cycling Motor Burnout Hazard: Reciprocating air compressor motors generate massive inrush starting currents (up to 6× rated FLA). An undersized tank causes the pressure switch to bounce between cut-in and cut-out 20 times an hour, overheating motor windings and melting magnetic contactors.
Frequently Asked Questions
What is the primary function of an air receiver tank?
Beyond buffering peak air demands and damping pulsation from reciprocating pistons, receiver tanks act as thermal radiators. Warm, compressed air cools against the steel tank walls, allowing moisture and oil aerosol to condense and drain out before entering air lines.
What is the standard rule of thumb for air receiver tank sizing?
The general industrial guideline is 3 to 5 gallons of tank capacity per rated CFM of compressor delivery (or 1 gallon per horsepower for screw compressors). For heavy surge applications (like sandblasters or tire changers), size for 6 to 10 gallons per CFM.
Why must air tanks have an ASME certification stamp?
Compressed air stores explosive pneumatic energy. OSHA and state boiler inspector codes mandate that all pressure vessels operating above 15 PSI must be engineered, x-ray welded, and certified to ASME Section VIII Boiler and Pressure Vessel Code standards.