manxpoison3 posted an update 4 months, 1 week ago
Single stage units compress the air in one stroke, from ambient to end pressure. They typically go up to 20 CFM (cubic foot per minute) at a pressure of 125 psiFor more power, you will need a two stage compressor. A two stage compressor uses two stages to compress the air to the end pressure. This means your compressor will have two cylinders/pistons.The big cylinder is the low pressure stage, while the small cylinder is the high stage. In between the stages the air is cooled.Two stage air compressors go up to about 50 CFM capacity at about 175 psi.Whether you need a single or two stage compressor ultimately depends on the amount of capacity (cubic foot per minute) you need.2. Capacity and pressureThe capacity (CFM) and the pressure of the air compressor are the two most important specifications.To find out the capacity that you need, simply add up the air consumption of all the air tools that you will use.Small tools like nailers use only a little air, while big tools like sanders and grinder use lots of compressed air!To find out the pressure that you need, check again the specifications of the air tools that you plan to use. The highest required pressure dictates the pressure that you need.It’s always smart to buy a compressor that is capable to deliver more than you need. You will probably add more tools in the future, and almost all compressed air systems will have a leaking hose or coupling somewhere!3. Horse powerYou DON’T need to know the horsepower of the air compressor.The horsepower is a result of the required pressure and capacity that you need, not the other way around.Don’t look at horsepower. Look at capacity (CFM) and pressure (psi).4. Electrical connectionsYou wouldn’t be the first happy new compressor owner that comes home with an air compressor that he is unable to wire up!Know the voltage that you have at home. Know the maximum current that your wiring can handle. Do you really need them, or are they optional?Pressure regulators – to regulate the tank pressure back to a stable, lower pressureSize and number of air connectionsVertical or horizontal tankManual or automatic drains9. WeightMost (online) stores will drop your new air compressor on your drive way. You will need to bring it into your garage or wherever you want to place it yourself.Your new air compressor will probably come on a wooden pallet. Duty cycleLast, but definitely not least!The duty cycle is the percentage of time your compressor can run.Most single stage compressor have a duty cycle of only 50%. This means that when you run your compressor for 5 minutes, it needs 5 minutes to cool down.Most dual stage compressors have a duty cycle of 100%. They can run 24 hours per day when needed.If a compressor has a 100% duty cycle, it is often advertised. Beware when the duty cycle is not mentioned.. it is probably only 50%!ConclusionsAs you can see, there are lots of things to think about when buying an new air compressor. The above list will help you make a good decision. If you can’t choose between two models, always pick the bigger unit.We provide air compressor parts; contact us to figure out more.