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This guide is to be used as a general introduction to compressed air and its uses. Terms: There are a number of terms used in the
compressed air industry, below are a few of the most
used and a brief explanation of what they mean.
Displacement (Volume)
This term is used to decide the theoretical volume
of a compressor, ie the swept volume of a cylinder
multiplied by the number of compressions in a minute
and expressed in cubic feet per minute (CFM).
This figure should not be used in calculating the size
of compressor required, as it bears no relationship to
the free air figure that you may require.
Free Air delivered
This measurement is the volume of air taken in to a
compressor and therefore describes more accurately
the volume of air available for use. Expressed as
CFM/FAD at a given pressure.
Remember: Displacement is the theory and CFM/FAD
is the actual volume available.
Pressure
This is the way force, ie power, in the compressed air
system is expressed and is measured in either pounds
per square inch (psi) or bar.
Pressure is important because to have too low
a pressure would cause the equipment not to work
correctly, too high a pressure would at best rapidly
wear out the equipment, at worst it could make the
equipment lethal.
See the enclosed technical information chart for the
correct pressure for individual piece of equipment
Single Stage Compressors
One or more cylinders producing
the final pressure in one compression.
Normal maximum pressure 150 psi. g.
Two Stage Compressors
First stage, air is compressed
to approximately 30 psi. g,
cooled then compressed
to final pressure in the
second stage.
Normal maximum
pressure 200 psi. g.
Note: Two stage provides
more air for less energy.
Power Supply
Single Phase.
Standard supply for domestic and light industry 220/240 volts.
• 5 Amp light circuit Not suitable for equipment
• 13 Amp ring main Max 2.5 hp std compressor
Max 3.0 hp for LC compressors
• 45 Amp cooker/shower Max 3.5 hp compressor
Three Phase
Main electrical supply to industry.
• 380/440 Volts Any size of compressor
Main Benefits of Three Phase
• Approx 2/3 cost saving over single phase
• Stable supply
• Longer motor life
Main Benefit of Single Phase
• Excellent second-hand resale value
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