TERMINOLOGY

Single-acting compressor: If the air admission from the atmosphere is on only one side of the cylinder.
Double-acting compressor: When, the air from the atmosphere is drawn on both sides of the piston.
Single-stage compressor: If the total compression is done fully in one cylinder.
Multi-stage compressor: If the compression is carried out in more than one cylinder, and every cylinder carries out a part of the compression.
Free Air Delivered (FAD): It is the actual volume delivered at the stated pressure, reduced to intake pressure and temperature, and expressed in cubic metre/minute (m3/min). FAD is used to measure the capacity of a compressor.
Displacement or Swept Volume of the Compressor: The volume displaced by piston movement between two dead centers is called displacement or swept volume. For a single acting compressor, swept volume, where d = diameter of piston and L = length of stroke

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