Stationary air compressors are large, tank mounted machines for garages and workshops that run air tools, spray guns and blasting cabinets for long periods. They differ from portable compressors on the next page, which are made to be carried to a job. The first decision is the air demand of the tools you will run, because a compressor that cannot keep up forces you to stop and wait for the tank to refill.
Air delivery is the number that matters most. Every air tool lists the volume of air it needs at a stated pressure, and continuous tools such as sanders, grinders and spray guns need far more than nailers or tyre inflators. Compare the compressor's air flow rating at the pressure your tools use, and leave a margin. Among the 14 products that list tank volume, most fall between 60 and 80 gallons, and 70 gallons is typical. A larger tank evens out demand and lets the motor rest between cycles, but it does not raise the air flow the pump can deliver.
Power supply and installation are the next questions. Most stationary compressors run on a dedicated higher voltage circuit and need correct wiring, and some need a specific plug or hard wiring by an electrician. Vertical tanks take less floor space, and two stage pumps are made for heavier, longer use. Noise is significant, so many owners place the compressor in a separate room or shed and run air lines to the work area.
Before buying, check the voltage and amperage, the air flow at the working pressure, the duty cycle, the pump type and whether it is oil lubricated, and the dimensions including height. Plan for a pressure regulator, a filter and a water separator, drain the tank regularly, and check that the floor can take its weight.
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