A Little More About Compressors That You Should Know

Compressors are indispensable within a workshop, body shop, locksmith, and tire shop, as they facilitate and speed up some services performed in these places. Compressors that uses Compressed Air Cost and Savings Calculator Online for instance generate and store compressed air from mechanical movements produced by electrical energy or gasoline and diesel engines. They can be used in various situations, such as spray guns and tire inflation. They can be for domestic, professional, or large industrial paintings, wall paintings, crafts, and rust.


In general, compressors can be 1 or 2 stages. When in 1 stage, the cylinders that make the aspiration compress the air and have equal diameters. The 2-stage ones, on the other hand, have two cylinders that perform different tasks; the larger diameter cylinders (with air filter) perform the aspiration, and the smaller diameter cylinders (without filter) compress the air into the vessel.

Piston compressors can be classified into 3 pressure lines:

Low PressurePressure – 120 lbs maximum and 80 lbs minimum;

Medium PressurePressure – maximum 140 pounds and minimum 100 pounds;

High PressurePressure – 175 lbs maximum and 125 lbs minimum.

To facilitate the understanding of compressors, it is essential to know the meaning of some nomenclatures, such as:

PCM = Cubic feet per minute (Feet³ or PCM), which is the theoretical displacement of air per minute into the pressure vessel through the block, exerting the required PressurePressure.

Pounds or PSI is the PressurePressure from the air outlet from the compressor block into the reservoir.

We also need to understand some equivalences of PressurePressure and air displacement. PSI, LIBRAS, KGF, and BAR say the same thing and mean PressurePressure.

For example: 1 PSI = 1 pound (lbf/in2) 1 kgf/cm2 = 14,223 pounds – Ex 175 lb = 12kg theoretical | 140 lb = 9.4 kg | 120 lb = 8kg 1 Bar = 14.51 pounds 1 PCM = 28,316 lts. of air per minute (displace. Theoretical) into the vessel.

But What Are Compressors And Intermittent Pneumatic Tools Anyway?

Compressor and pneumatic tools for intermittent use: these are machines that, in their functions, are suffering stops due to the system in which they are applied.

Intermittent compressor: there is an instrument called a “pressure switch,” which turns the engine on and off when the compressor reaches the maximum or minimum working pressure.

Compressor for continuous use: there is a “continuous valve,” also called a “cannon,” which prevents the compressor from tripping when loaded at maximum PressurePressure. The compressor releases excess air through the valve, preventing it from turning on and off and starting the engine, saving energy and preventing equipment wear.

With this, it is clear that when we buy a compressor, it is important to dimension the correct use. This way, you will have the ideal performance when performing any service.

Let’s Understand How To Calculate?

To dimension the ideal number of feet for a given use (if you use more than one piece of equipment at the same time), it is necessary to make the following calculation:

Sum the PCM (Pneumatic Air Consumption) ÷ 2 (intermittent) ÷ 0.75 ( efficiency) = Result

Remember if: It is essential that a magnetic starter key is always used between the equipment and the direct connection. This will ensure that the compressor does not burn out if there is any change in the electrical current.

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