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China Air Compressor-Air Compressor Selection: 5 Things


In order to make the air supply correct, you need to ar […]

In order to make the air supply correct, you need to arm yourself with the right knowledge. This is how it is done.



1.Understand the basics

Analyze the requirements of the equipment to be powered. Are you going to use compressors to power mechanical or pneumatic tools, or to inflate tires? If you plan to use a tool that requires high flow, you may need a compressor with a box. If you plan to use it only for airbrushes or filled tires, you may need a portable compressor without a fuel tank. Since there is no storage tank for compressed air, the type without storage tank will run continuously, which is usually not a problem, because they are usually very small, so the noise is very small.

In particular, consider the pressure and volume requirements of any tool you may use. Obviously, heavy tools require more pressure, which in turn requires more volume. If you fail to choose a compressor large enough to achieve the intended use, you will find yourself waiting for the tank to refuel on a regular basis, thereby reducing work efficiency.

If a portable air compressor is used for the spray gun, for example, a small tank capacity of 5 liters (1.3 US gallons) and a continuous air pressure of about 30 psi are sufficient.


2.Understand the available compressor types.

Essentially, there are two different types of air compressors: reciprocating and rotary screw. The most common type you might see somewhere is the reciprocating piston type. It has a cylinder with a piston that can move up and down and a one-way valve on top of the moving piston. Some air compressors utilize a dual piston device to obtain higher flow and / or pressure. Another type of air compressor is a rotating screw. They are designed for continuous use and are often used with tools that run for a few seconds (or minutes) at a time, such as impact wrenches and air guns, and in industrial applications.
Piston compressors are divided into single-stage and two-stage. Single stage pressure can reach 150 psi.

Two-stage compressors use two pistons of generally different sizes to provide a pressure of about 200 psi. The larger piston compresses the air to approximately 100 psi, and the second piston compresses the air to approximately 200 psi. Note that a single-stage compressor may have two pistons, but it is still considered a single-stage because the second piston has the same size and the maximum pressure is only 150 psi. The advantage of this design is that it compresses air faster than single-piston compressors. Just because the air compressor has dual pistons does not mean that it is a two-stage compressor.

A single-stage compressor is sufficient to power most pneumatic tools, caulking guns, spray guns, glue guns, and of course can inflate tires and rafts. When the owner expects a higher utilization rate, both single-stage and two-stage dual-piston compressors are more commonly used.



3.Technical parameters of air compressor

Check the horsepower (HP) of the air compressor. The power range of air compressors is usually between 1.5 and 6.5 HP. There are air compressors with larger HP capacities, but they are generally reserved for industrial use and provide greater psi. Many blogs and articles online indicate that horsepower ratings have changed in recent years. If you want to compare today's model with an older model, it is best to look at the flow rate instead of the HP rating.  Small-scale applications do not require as much horsepower as industrial applications.

Although horsepower is an important sign in determining your air compressor, it should not be unique. If you can find it, the more valuable will be the CFM level or cubic feet per minute. Please read the following to learn more about CFM.
Try to view cubic feet per minute (CFM). CFM is a measure of volume flow. It's easy, right? The difficult part is that the CFM varies with the psi of the compressor, which means that two tools with different psi may not necessarily have a CFM that can be simply added together, and this is exactly what you want to do. This is the tricky place. Let's try to keep it simple:


Look for or ask about standard CFM (SCFM) when evaluating compressors. At 68 ° F (20 ° C) and a relative humidity of 0%, the standard CFM measurement is 14.5 PSIA. [7] (If you choose not to use SCFM, make sure to use CFM numbers that are fixed at the same psi.)
When you get the SCFM of all pneumatic tools that will be used at the same time, add up their SCFM and then add 30% as a safety buffer. This will give you the maximum CFM usage required to complete the job. When choosing an air compressor, you want to be close to this number, so as not to waste time buying a compressor that is too small, and not wasting money to buy a compressor that is too large.
For example, suppose you are using a grease gun (~ 4 CFM @ 90 psi), a frame nailer (~ 2 CFM @ 90 psi) and a double sander (~ 11 CFM @ 90 psi) at the same time. Add all the CFM to obtain 17 CFM at 90 Cpsi as the maximum required CFM.


4.Consider space and portability.

For example, can you roll the compressor or lift it off the ground? The air compressor can be a small portable item or a larger, more powerful fixture. Portability is convenient, but if you leave it in a corner of the garage, you can switch to a longer hose and use a larger capacity compressor. Essentially, does this compressor need to provide a nail gun on the roof or just fill the tires in the garage?



5.Consider your power supply

Will you always have the luxury of electricity, or will you be in an environment without electricity? If you are always by the socket, you can choose a drive system with a motor. Most electric air compressors will run at 110V (US), but some larger air compressors will run at 240V. Check before buying.

In addition, you need to consider the use of mobile air compressor options. Mobile air compressors can be operated with gasoline or diesel engines, can be integrated into the vehicle's existing engine, or can use hydraulic ports or other PTOs. Fortunately, there are many modern methods for powering air compressors.
If using a compressor installed in the water tank, determine how large the water tank should be. If you only need a short time air compressor (for example, when using a nail gun), then you can have a small tank. If you want to use the compressor for a long time, you need to enlarge the oil tank. The tank size is usually measured in gallons.


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