How to Choose an Air Compressor – A Brief Guide

So, your company will need the compressor. Consequently, you will have to find a job and submit it to superiors their proposals. Selecting the compressor – it is responsible. Before you go shopping, you should determine in advance what kind of machine is right for your purposes.

1. What does the compressor?

The compressor compresses the gas.

2. What kind of gas must be compressed?

If the answer is – “Air”, then you need an air compressor. If you need to compress other gas – then look to a gas compressor or any of the specific compressor. Separately emit carbon dioxide compressors are used for liquid or solid carbon dioxide (carbon dioxide), and refrigeration compressors, which compress ammonia, freon or other refrigerants and are used in refrigerators.

3. What a performance, or how much gas must be compressed per unit of time?

Сapacity or flow rate and is measured in cfm or cfpm.

4. To what pressure should compress the gas?

(The initial pressure, usually atmospheric, and if not, then we must ask and from what?)

Final pressure is usually called the discharge pressure (outlet pressure, discharge pressure) and can be expressed as an absolute, ie zero-based, and as excessive, ie, the correction to the atmospheric pressure. Measure the pressure in PSI.

5. What causes the compressor to compress the gas?

This is the drive. Drive is usually electric or diesel. Important driving power, measured in kilowatts kilowatt (kW) or horsepower hp (HP), 1 HP = 0.74 kW and rotational speed, measured in revolutions per minute, (rpm). Important for the motor voltage, which is measured in volts, (V), the frequency of the supply voltage, measured in Hertz, (Hz).

For estimates of useful to remember that for every 35.3 cubic feet per minute performance general-purpose compressor (pressure 7.. 10 atm.) need somewhere 7-8 kW of installed capacity of the drive.

6. Will compressor traveler?

When answering this question, you make a choice between fixed and mobile compressor compressor station. Stationary compressors are installed in the shop for a permanent seat, high-performance model – to the carrier frame or foundation. The mobile compressor stations are mounted on the chassis and move on construction sites, road construction, the oil industry…

7. How cool the compressor?

All of us were taught in school that the gas is heated during compression. Therefore, when the compressor is released large amounts of heat, which is required to remove the cooling system. Main varieties – air cooled and water cooled. For the latter requires a supply of recycled water, so you should ask the water flow rate per unit time.

8. Does the compressor air receivers (receiver)?

If not, then maybe you’ll have to buy it separately. Air Receivers smooth surge of gas, provide a supply of compressed gas in suspension compressor stability of automatic control.

In most cases it is optimal amount of air tanks to 35.3 cubic feet for every 70.. 140 cubic feet per minute. of the compressor.

9. What the compressor is inside?

Most often it is the cylinders with pistons (piston compressor, of course), or a pair of screws (Screw compressor), which are steadily being driven gas, reducing its volume. Usually (with the same performance) Piston cost less noisy, more and more easily repaired, and the screw – expensive, quieter, safer and more economical.

10. With butter or no butter?

To improve the efficiency of the compressor clearance between the piston and the cylinder with a piston compressor and between the screws – in screw – usually filled with oil. Naturally, some of the oil is in the compressed air. For his department used oil separators and filters. In cases where the oil content in compressed air must be very small or apply oil-free (dry) compressors are more expensive than usual and have less reliable or expensive sets of filters of high purity.

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