Specialised Welding Products Ltd AIR TOOL CONSUMPTION GUIDE When assessing the size of a compressor to operate air tools and equipment please use the air compressor FAD (free air delivered) - this is the correct volume you need to know in order to ensure that a compressor wilf operate your equipment efficently. Column 1 is manufacturers stated tool consumption under continuous use in CFM. Column 2 is average time of use in seconds. Column 3 gives CFM required to operate tool under normal conditions of use. DESCRIPTION 1 2 3 DESCRIPTION 1 2 3 1/4" Drill 15 30 7.5 3/8" Drill H.D. 22 15 5.5 3/8" Drill 18 15 4.5 1/2" Drill H.D. 27 15 6.75 3/8"'Slimline'Drill 17 15 4.25 3/8" Angle Head Drill 12 15 3.0 1/2" Drill 18 15 4.5 3/8" Drive Impact Wrench 11 10 1.8 1/2" Drive Impact Wrench .21 _ 10 - 3.5 3/4" Drive Impact Wrench 38 6 3.8 1" Dr ive Impact Wrench 70 6 7.0 1" Drive Hi-Torque Impact Wrench 92 6 9.2 1/2" 2 Way Drive Wrench 27 6 2.7 3/8" Dri. Ratchet Nut Runner 22.5 6 2.25 1/2" Dri. Hi-Torque Impact Wrench - 31 - 6 - 3.1 3/4" Drive Impact Wrench 45 6 4.5 1" Impact Wrench 92 6 9.2 3/8" Sq Dr Impact Wrench Angled 22.5 6 2.25 Shear (to 14 SWG) 18 30 9.0 Air Vacuum Cleaner 15 15 3.75 4" Right Angle Grinder 23 14 5.37 Orbital Sander 23.5 30 11.75 5" or 6" Random Orbital Sander 13 20 5.99 7" Vertical Sander 27 15 6.75 Heavy Duty Air Hammer 18 13 4.5 Power Hack Saw and File 14 15 3.5 7" Vertical Disc Grinder 80 , 15 20.0 Light Weight Grinder 18 15 4.5 Random Orbital Sander with Vac Alt 18 20 12.0 Orbital Sander 22 30 11.0 Random Orbital Sander 6" 22 30 11.0 Hi-Speed Sander 25 ,10 U Long Bed Orbital Sander 22 20 7 J Air Hammer 25 15 6.25 4" Grinder 1400 rpm 12.5 20 4.17 Fibre Glass Saw 17.5 10 2.9 Terms: There ore o number o( terms used in the compressed oir industry, below are o few of the most used and o 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 o 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, os it bears no relationship to the free air figure (hot 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 lo have loo 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 113 Amp ring main • 45 Amp cooker/shower Not suitable for equipment Max 2.5 hp std compressor Max 3.0 hp for 1C compressors Max 35 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 «ond-hand resale value N ote: The figures in fne Air Equipment Consumption Table are only a guide, for additional information please p/ione oar help desfc, Choosing the Right Compressor Three-phase compressors ore more efficient producers of compressed air than single-phase equivalent units, so where a three-phase supply is available the best option i; the three-phase compressor. Single-phase compressors up to 2.5 hp can operate from 240V13 Amp power supply, with the exception of the ne1 3 hp Low Current models. 3.0 hp and above must operati from a 240V 30 Amp supply. Wherever possible choose a larger compressor than you require at present to allow to expansion. Compressors with cast iron cylinders running slow, offer a much extended service life. 1) Bodyshop - using the air equipment consumption guide, add all the equipment consumptions together and divide by two, the resulting figure is the minimum free air you require. 2) Workshop - using the air equipment consumption guide, add all the equipment consumptions together and divide by three, the resulting figure is the minimum free oir you require. Note: For calculation purposes always usefree oir lures. A) Ask Questions 1 What is the air to be used for? 1 What is the maximum pressure required? (see consumption guide) 3 What electricity supply is available? (single/three phase) 4 What size compressor is currently in use? (see quick calculation guide below)