How to choose an air compressor


powertoolsfit / July 16, 2017

What is an air compressor?

As always we start with the most basic: what is an air compressor, how it works and what it serves. It is a tool that enables the generation of energy thanks to the understanding of air. This achieves by exchanging power between the machine and the fluid. The work exerted by the compressor transmits to the substance that circulates in its interior. Thus becoming flow power, thus increasing its pressure and kinetic energy by getting it to flow. One of the aspects that split them from the pumps is that. They are thermal machinery in which the working fluid is understandable. In fact, they suffer from an appreciable change in density and degree. Which also separate them from blowers and fans, which drive natural fluids. But do not increase their pressure, density lot.

In less technical condition, we can say that air compressors are devices. That use the mechanical energy to transform it into pneumatics. Compressing the air through an increase of pressure and then transfer. It to another tool through a tube or hose.

Once we know how air compressors work, it is easy to guess their applications. They are mainly used to inflate various objects such as wheels. Or balls, in refrigeration systems, to generate electrical power. In the manufacture of aircraft engines such as turbo-reactors. Or to compress gases in tire feeding systems, among many other uses.

They are tools with a great versatility that various extra functions. An example of this is the Makita air compressors which boast high performance, excellent value for money too. And also a wide range of models and designs made to perform. All kinds of tasks in an efficient and accurate.

Do you want to buy air compressor but you need more information about these devices?

Air compressor

One of the most useful tools in the market, are Air Compressors. In the private field, we usually use them to inflate a balloon or our bicycle. While in the industry they use to power various tools. Surely this guide on how to choose industrial or domestic air compressors will be handy to know which air compressor to buy and distinguish between different types of air compressors.

How to choose air compressor? Classes according to power

To choose an air compressor, we have to evaluate many factors that directly affect both its performance. The type of use that will work best. Let’s start by knowing the types of air compressors according to their power:

Air compressors up to 2CV – Air compressors up to 2CV have a reduced power. So they were particularly suitable for domestic work such as painting, varnishing, cleaning, inflating mattresses, balls, etc. Its price usually reduces, Although we must pay attention to other features when choosing one as to its storage capacity. Or the air flow that it can offer, to know how to choose an air compressor that suits our needs.

Air Compressors up to 4CV – A 4CV air compressor is the best option if what we are looking for is an intermediate point, that is, a tool that can use for both domestic and professional work. They have a higher weight, so it is worth buying 4CV air compressors that incorporate wheels to facilitate their transfer.

Air Compressors over 4CV – Air compressors with a power above 4CV are produced especially for professional tasks where greater force is required. Such as cutting materials, breaking rocks, pouring concrete, construction work.

How to choose an air compressor? Technical aspects to take into account

When talking about Air Compressors, we must remember three primordial aspects:
What air pressure is needed, expressed as PSI, BAR, etc.
How much air can be compressed (Flow or Volume), expressed as CFM, PCM, l / min, or m3 / min.
What power I require, this expresses in CV, HP or KW.

Air Pressure: This is the pressure at which the compressor can work and measure in pounds square inches / inches2 which is the same as PSI (Pound Per Square Inch). The test also uses in Bars (BAR).
1 BAR = 14.5 PSI

Flow or Volume: This is the capacity of the compressor to press the air over a unit of time and measure in CFM (Cubic Feet Minute) which is also the same as PCM (cubic feet per minute) of min (liters per minute ).
Power: In this case is the working capacity of the compressor and is measured in HP (Horse Power, horsepower) or CV (Steam Horses). Also used are KW (Kilowatts)
a.1 HP = 0.74 KW
b.1 HP = 1,0138 HP
c.1 CV = 0.73 KW

In the end, all this helps us to understand that when choosing an air compressor. I must take into account that the CFM depend on the PSI of the compressor too. On the other hand, the greater the power or horsepower of the compressor. The more air can supply the equipment (CFM). There is a standard, that is, most tools work at 90 PSI, some at 100 PSI and some at 120 PSI.

To choose an air compressor and know which air compressor is best.

You have to read or have an easy data, add them and ready, compare with a table to know what type of equipment is needed.
As for the laws on compressed air. There are some Coefficients of Correction of Consumption that we will not have in the account here. These can be:
Ratio of Use
Coefficient of Simultaneity
Rate of Enhancement
The coefficient of Operation Cycle.

This use for when the compressor has an industrial use and are many tools of different powers connected. Besides that, not all will compare to the time. To avoid this and make it simple, when choosing a compressor we just increase the consumption of 30% more, to the general calculation that done.

An example of this can be:
I need to buy a compressor to power these tools:
350 l / min @ 90 PSI Sander
Blow Gun 150 l / min @ 90 PSI
Drill 350 l / min @ 90 PSI
All this adds up: 350 + 150 + 150 = 650 l / min @ 90 PSI + 30% = 845 l / min @ 90 PSI
Now, if we look at the table:
Table To buy a Compressors

We need a 7.5 HP Compressor. A team like this meets all the characteristics:
Compressor 7.5 HP with 830 l / min and tank of 500 liters
Power of 7.5 HP
Tank with capacity of 500 liters
Large diameter fan
Cast Iron Cylinder
Flow rate 830 l / min
Pressure to 10 Bars
Weight 255 kg
Lubricated with Oil
When we require a Compressor, we can think of the following feature. Since depending on this know if we expect something bigger or smaller.

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