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About Piston Compressors

Types of Piston (Reciprocating) Compressors

Single Stage
  • Air is compressed once and forced into the tank
  • May be one or more cylinders
  • Mainly for hobby use
Two Stage
  • Air is compressed in the first stage in a larger diameter cylinder, it is then cooled in the intercooler, and finally is compressed again in the second stage in a smaller diameter cylinder
  • Best for commercial use or serious hobbyists
Simplex
  • Only 1 pump and 1 motor
Duplex
  • Can be used as an alternative to one larger compressor
  • Control panel alternates between unit A and B
  • Has built in back-up

Sizing Tips

  • Look at current compressor and identify size, how often it runs, and if expansion is possible
  • Keep in mind there are two types of air usage:
    • Inconsistent air usage: air tools that start and stop (impact wrench, DA sander, paint spray gun, sand blasting cabinet, etc.)
    • Consistent air usage: requires a consistent and steady air flow (paint agitator, factory equipment, regenerative dryers, air leaks, etc.)

Advantages

  • Relatively low initial cost
  • Simple and low cost maintenance
  • Good for applications with inconsistent air needs

Additional Notes

  • Duty cycle: The pump should run 60% of the time
  • Pump RPM: slow running pumps are quieter, cooler, more efficient, and last longer
  • Intercooler: reduces temperature of compressed air between stages, making the second stage of compression more efficient