How to size an air receiver tank
A receiver buffers the compressor from the demand side. Too small a tank lets pressure collapse whenever several cylinders fire at once, and it forces the compressor into rapid start-stop cycling that wears out the motor and controls. Enter your peak consumption, the time the tank must carry that load, and the usable pressure window to get the volume you need.
The calculation uses the standard receiver formula V = T × C × Pa ÷ (P1 − P2), where T is the hold time in minutes, C is the air demand in SCFM, Pa is atmospheric pressure at 14.7 psia, and P1 and P2 are the starting and ending pressures. Entering gauge pressures is fine because the difference between them is the same in absolute terms.
A wider allowable pressure drop means a smaller tank, but pressure must never fall below what the end equipment needs, so account for piping losses and filter or regulator drop when choosing the minimum. For a machine with a very short, very large draw, a small point-of-use receiver next to that machine is often more effective than enlarging the main tank.
These figures assume isothermal conditions and give a preliminary volume. An actual receiver is a pressure vessel that must meet ASME Section VIII design and inspection requirements and carry a relief valve and drain, so confirm the specification with the manufacturer and your local code before ordering.
Frequently asked questions
Not directly, but it cuts the number of load and unload cycles, and those transitions waste energy. In practice many plants see a modest drop in consumption for the same output.
For a brief demand spike, half a minute is often enough. If you also want to ride through compressor start delay or a short outage, use one minute or more depending on how critical the process is.