THE BASICS // AIR SYSTEMS 17 Compressor Guide SIZING AN AIR COMPRESSOR 1 List the types of pneumatic devices/equipment to be used and how many will be used at the same time. 2 Add total of air volume (SCFM) required by pneumatic tools being used. Utilize the chart below. 3 Add additional 25% to compensate for airline leaks and pressure drops. 4 Identify the air compressor that will provide necessary SCFM. The following professional electric 2-stage compressors provide the listed: SCFM* HP 5 HP 7.5 HP 10 HP SCFM 17.2 SCFM 24 SCFM 35 SCFM HP 15 HP 25 HP 30 HP SCFM 42 SCFM 97 SCFM 106 SCFM *SCFM Ratings at Sea Level 5 Once the correct HP rating has been selected based on the air volume requirements and voltage of compressor, you will need to know the type of available electric service to determine the need for a single phase or three phase compressor. EXAMPLE TOOLS BEING USED Tire Changer 1/2" Impact Wrench 3/4" Impact Wrench Hydraulic Lift SUBTOTAL TOTAL SCFM SCFM 5.5 SCFM 3.5 SCFM 7.5 SCFM 6.0 SCFM 22.5 SCFM X 1.25% 28.125 SCFM TERMINOLOGY: General Definitions COMPRESSORS Machines for compressing air or gas from an initial intake pressure to a higher discharge pressure. SINGLE-STAGE COMPRESSORS TWO-STAGE COMPRESSORS Those machines in which compression from initial to final pressure is completed in a single step or stage typically less than 100 PSI. Those machines in which compressions from initial to final pressure is completed in two distinct steps or stages typically greater than 100 PSI. INTERCOOLERS Devices for removing the heat of compression of the air or gas between consecutive states of multistage compressors. LOAD FACTOR The ratio of average compressor output during a period of actual use to the continuous rated output of the machine. PISTON DISPLACEMENT (PD) Piston Displacement (PD) is determined by precisely measuring a volume of air which has been raised to a specific pressure and is expressed in conditions existing at the compressor discharge. This flow rate is generally stated in terms of actual cubic feet per minute (CFM). TERMINOLOGY: Accessories 90-100 MAGNETIC STARTERS AFTERCOOLERS/ DRYERS AUTOMATIC TANK DRAIN Magnetic Starters provide thermal overload protection for motors and are recommended for 3 HP and larger motors. Aftercoolers/Dryers remove moisture from the air line as air cools from compressor. Automatic Tank Drain automatically removes water that has accumulated in the compressor tank as air cools. LOW OIL SWITCH This switch prevents the air compressor from operating when oil is low. 125-150 125-150 125-150 125-150 Paint Gun - Touch Up Rim Stripper Tire Changer Tire Inflation Line Tire Spreader *Approximate CFM. Individual Equipment may Vary 4 6 1 2 1 Customer will need an air compressor that produces a minimum of 28.125 SCFM @ 175 PSI. Customer will need a 10 HP compressor or two 5 HP compressors. COMPRESSOR SELECTION GUIDE After listing all the air operated devices to be supplied by the air compressor, determine from the chart, pressure range and volume of air required by each device. The air compressor must maintain a minimum pressure at least equal to the highest of the pressure ranges. Always use free air (CFM) and pressure (PSI) from the nameplate on device or from manufacturer. Free air figures in the table are averages and should not be considered accurate for any specific brand. PSI 70-100 70-100 70-100 70-100 70-100 90-100 70-100 70-90 70-90 70-90 70-90 70-90 70-90 70-90 90-100 90-100 90-100 90-100 90-100 90-100 TOOL PORTABLE TOOLS Air Filter Cleaner Body Polisher Body Sander Brake Tester Carbon Remover Dusting Gun (Blow Gun) Panel Cutter Drill 1/16" - 3/8" 3/8" Impact Wrench 1/2" Impact Wrench 5/8" Impact Wrench 3/4" Impact Wrench 1" Impact Wrench Die Grinder Vertical Disc Sander Small File/Saw Machine Large File/Saw Machine Tire Buffer TIRE TOOLS Hydraulic Lift Paint Gun - Production 6 8 3 20 10 4 3 3 4 4 3 4 5 8 12 5 20 3 5 5 CFM* WARNING: For more information go to www.P65Warnings.ca.gov. SUPPLY CORPORATION ASCOT SUPPLY CORPORATION BUYER'S GUIDE AIR SYSTEMS // THE BASICS
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