Why you should buy the correct electric air compressor for your application?
You buy too small and either your efficiency is much lower than what it would have been with the correct unit or you cannot do the work at all.
You buy too big, you waste money and your compressor is running too cold and cause other technical problems.
You buy the wrong duty cycle quality, the machine will not last.
You buy a compressor with too low pressure and you cannot do the work you bought it for.
How do you select the correct air compressor?
There are four important figures you must take into account when you want to select the correct compressor:
1: The first and most important criteria before you can select an electric compressor is what electricity is available. Single phase or three phase and how many amps are available for the compressor. With three phase variable speed drive units, you multiply your kW by two to determine the Amps you require. All other three phase machines the horsepower by two. Single phase machines you multiply the horsepower by five. (4 hp. = 3kW)
2: What volume of air do you require? This is litre/min or Cub Feet per min (cfm) or m3/min. Without one of these figures, you are lost. You will have to get technical advice from Airpower. It is our best product and it is free.
3: What pressure do you need? This is measured in kPa, Bar or psi. Your compressor has a cut in and cut out pressure. The cut in pressure must be higher than the minimum pressure you require. Take into account you still have a pressure drop from the compressor to the point of use. Go to Tools in this web site to determine your pressure drop from compressor to your point of use.
4: What will your duty cycle be? Select the compressor suitable for the duty cycle. Screw or piston, variable speed drive, load unload or stop start. DIY, medium duty or heavy industrial duty.
What is less important when you select the correct electric air compressor:
1: The tank size is not so important. The tank size only determines the cut in and cut out cycles and will be determined by the designer of the unit. The tank size is only important if your air consumption is high for a short while and then low for a long time.
2: How many pistons the unit have is not important. The output of a compressor is not determined by how many pistons it has. The pressure is determined by how many stages the compressor has and you need at least one piston per stage.
3: It is not important if the pistons are in line or in a V configuration, as long as the piston pump cycles are equally spaced over the 360° turning of the flywheel. If not equally spaced, the compressor has a lower efficiency and the delivered air is much warmer than when the pistons are equally spaced.
Refrigerated air dryers from 750 liters/min up to 6500 liter/min ex-stock. Larger ex overseas. Dew point 4°C under pressure. Automatic drain pre and manual drain after filters.
Screw compressors have no valves or other mechanical forces to cause imbalances unlike piston compressors.
Airpower keeps universal spare parts for compressors. Pressure switches, non return valves and safety valves are universal to all compressors. Bottom entry filters/ regulators, electric motors and starters can be used for many makes of compressors.