Choosing an air compressor can leave you feeling lost if you don't know what to look for. That's because air compressors power a wide range of tools over a wide range of applications. In order to get your air supply right, you'll want to arm yourself with the right knowledge. Here's how to do just that
1
Analyze the requirements of the air tools that you will be using
the application you need to use compressor for it
will you use the compressor around the house for odd jobs like powering a caulking gun or inflating tires? You'll probably want a piston compressor with a tank if you plan on industrial use, while you may want a portable compressor without a tank if you plan on merely using it around the house.
- In particular, consider pressure and volume requirements of any tools you may be using. Obviously, heavy-duty tools require much more pressure and, in turn, more volume. If you fail to choose a compressor that's large enough for your intended use, you will find yourself periodically waiting for the tank to fill up, thereby decreasing your work efficiency.
- If the portable air compressor is for airbrushing, for example, a 5 liter (1.3 US gal) tank capacity and around 30 psi of sustained air pressure would be adequate.
- Choose between piston-type and portable compressors. Essentially, there are two different kinds of air compressors. Piston-type compressors rely on a motor which builds up air pressure when it gets depleted. These store compressed air in tanks. Portable compressors do not have tanks, and so much stay running continuously in order to deliver air.
- Piston-type compressors come in two varieties. The single-stage compressors use only one piston to compress air and top out at about 150 psi.[1] Two-stage compressors use two pistons to deliver near continuous air pressure, and top out at around 200 psi.[2]
- Single-stage compressors are adequate for more heavy-duty applications at home. Two-stage compressors are more often used in industrial settings where owners expect near continuous usage.
- Portable air compressors are more viable for light home use. Powering caulk guns, spray guns, glue guns, as well as for inflating small tires and rafts
- specifications.
- 1Look at the horsepower (HP) of the air compressor. A common range for horsepower on an air compressor is between 1.5 and 6.5 HP. Air compressors with larger HP capacity exist, but are usually reserved for industrial uses and offer far greater psi.[3] Small-scale uses won't require as much horsepower as industrial uses.
- While horsepower is a valuable marker in determining your air compressor, it shouldn't be the only one. More valuable will be a CFM rating, or Cubic Feet per Minute, if you can find one. Read more below for a detailed discussion of CFM.
- Try to look at Cubic Feet per Minute, or CFM. CFM is a measure of volumetric flow. Easy enough, right? The difficult part is that CFM changes depending on the psi of the compressor, meaning that two tools with different psi won't necessarily have CFMs that you can simply add together, which is what you want to be able to do. This is where things get tricky. Let's try to keep it simple:
- Look for or ask about Standard CFM (SCFM) when evaluating compressors. Standard CFM is measured as 14.5 PSIA, at 68 °F (20 °C), with 0% relative humidity.[4] (If you choose not to use SCFM, be sure to use CFM numbers that are all pegged at the same psi.)
- When you've got the SCFM of all your air tools that you'll be using simultaneously, add up their SCFMs, then add 30% to that as a safety buffer. This should give you the maximum required CFM usage you'll need to complete the job. When choosing an air compressor, you want to get close to this number so that you don't waste time with a too-small unit or waste money on a too-large one.
- Say, for example, that you're using a grease gun (~4 CFM @ 90 psi), framing nailer (~2 CFM @ 90 psi), and dual sander (~11 CFM @ 90 psi) at approximately the same time. Add all the CFMs to get 17 CFM @ 90 psi as your
- max required CFM.
Air Compressor Parts
Are you a repair tech and are looking for air compressor parts to keep in stock? We have this section organized by air compressor part group.
Whether you're looking to for individual air compressor parts for an uknown compressor or older air compressor or bulk air compressor parts to keep in stock for your repair shop, we have it. We have many different types Regulators, Pressure Switches, Gauges, Belts, Air Filters, Motors, Pulleys, Throttle Control Valves, Pilot/Unloader Valves, Air Tanks and much more to choose from, all listed by spec and description to make it easy for you to choose. Less confusion and fuss than other sites, we make it easy! Looking for large quantities of air compressor parts? We can work with you on quantity discounts! Call one of our great Sales Associates today and we'll get the parts you need, fast.Do you need parts for DeWalt, DeVilbiss, Bostitch, Powermate, Porter Cable, Campbell Hausfeld, Emglo, Jenny, John Deere, Hitachi, Husky, Kobalt, Mi-T-M, Rol Air, Sears Craftsman, Speedaire and other air compressors?
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