Dynabrade: Selecting A Compressor


Selecting A Compressor
Guidelines for Matching Proper Compressor to Workplace
A) Compressor Type    Base on your PSIG (Bar) needs
0 to 80 PSI G (5.5 Bar) – You may only need a single stage compressor.
80 to 250 PSI G (17.2 Bar) – You will need a two-stage compressor.
Two-stage compressors are recommended when tool use is continuous.
Note: Dynabrade air tools require operating air pressure of 90 PSIG (6.2 Bar).
B) Air Consumption
Determine the total demand SCFM (L/Min). List the requirements for all equipment, tools and other air
consumption variables (both continuous and intermittent air usage demands).
C) Compressor Horsepower (hp)
Use the determined total demand SCFM (L/Min) and add approximately 20% for system variables.
Add ______% for (your) future growth.
If the above total equals less than 100 SCFM (2,832 L/Min) divide this total by 4 to find the compressor hp.
If the total is over 100 SCFM (2,832 LPM) divide by 5 to find the compressor hp.
Example: System requirements = 165 SCFM (4,673 L/Min) @ 100 PSIG (6.9 Bar)
165 ÷ 5 = 33 hp
Resulting in a suggested compressor size:
30 hp to 40 hp compressor
D) Tank Size
As a general rule, the larger the tank, the better the system. Use a larger tank for installations where large flows
of short duration are needed.
Example: For a 5 hp compressor use a 60 Gal. (227 L), 80 Gal. (303 L) or 120 Gal. (454 L) storage tank.
E) Controls
Stop-Start – The motor stops when the compressor unloads and starts again when the pressure in the receiver
drops. Use a stop-start pressure switch control for a small system. (Compressors up to 15 hp.)
Continuous Run – Equipped with constant pressure control, loading and unloading as the supply of
compressed air in the receiver drops or reaches a maximum.

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