Collection: Air Compressor Tanks

A 120 gallon receiver drawn from 175 down to 150 PSI gives up about 27 cubic feet of free air. A tool pulling 30 CFM empties that in under a minute. That's what a tank does. It buys you seconds at peak, and it does not make air.

Worth saying plainly, because it's the mistake we see most. If the compressor can't keep up with average demand, a bigger tank delays the pressure drop instead of fixing it. Storage covers short spikes, not a shortfall. A blast cabinet, a plasma table or a 6 inch sander running continuously needs more compressor, not more steel.

Sizing and placement

Figure 3 to 4 gallons of storage per CFM, or 10 to 15 liters per CFM in metric. A 200 gallon tank supports roughly 50 to 60 CFM at peak demand. Our guide to sizing compressed air storage works through the math if you want to check your own system.

Split the storage if the layout allows it. A wet receiver at the compressor, ahead of the dryer, knocks down condensate and dampens pulsation. A dry receiver out near the heavy demand is what actually covers the surge, because air sitting 200 feet away behind 3/4 inch pipe can't reach the tool fast enough to help.

Check before you order

Pressure rating first. Tanks come rated 150, 165, 200 and 300 PSI, and a 150 PSI tank behind a two stage compressor that cuts out at 175 is the wrong tank. Then orientation and mounting. Vertical saves floor space, horizontal fits under a low ceiling or on a skid, and top plate versions carry a pump and motor directly. Sizes run from half a gallon to 5,000 gallons, with base ring, saddle leg and grasshopper mounting.

Last thing: every tank collects water, and how much depends on run time and humidity. Drain it on a schedule or put a dryer ahead of it, or you'll be pulling rust out of your air tools by next summer.