Applied Product Catalog 2017 2018 Page 610 Pneumatic Products

610 Call your local Applied service center to order at 1-866-351-3464 or visit us online at Pneumatic Products AIR COMPRESSOR TERMINOLOGY CFM : Cubic Feet Per Min. This is normally stated at various pressures, 100 psig, 125 psig, 150 psig or 175 psig. It is important to note that most air tools, air cylinders, hoists, etc. operate at 90 to 100 psig. There are, however, applications that require higher pressure so it is very important to know how much ft 3 /min is required by the system and at what pressure. Horsepower cannot be accurately determined unless ft 3 /min is known and at what operating pressure. PRESSURE: Normally stated as PSI or PSIG. Compressors operate at various pressures so it must be known what the pressure requirement is before selecting the type of compressor. If the pressure is too low the equipment will not run properly or might not run at all. Some compressors' operating pressure will not fit all applications, so be sure that both the actual ft 3 /min and required pressure is known before a compressor is selected. AIR RECEIVERS: A required component of an air system. This is a tank that stores compressed air at a pre-determined pressure prior to being released into the air system. Air receivers are available in horizontal or vertical configuration. Normally, air receivers for compressors mounted on the receiver are horizontal due to ease of compressor maintenance. On smaller reciprocating compressors, a vertical air receiver is available. In this case the compressor is still mounted on the receiver, but higher in the air making maintenance on the compressor more difficult. The reason for a vertical receiver is a smaller footprint where less space is available for the compressor unit within the shop or plant where it is being used. Rotary screw air compressors also require a receiver, but these are normally separate from the compressor and would be vertical in position. RECIPROCATING AIR COMPRESSOR: Sometimes known as a piston compressor. Air is compressed by a piston moving up and down in an enclosed cylinder. Air is taken in through an air filter into an air cylinder through a valve. As the piston moves upward, the area of the cylinder is reduced. As the area is reduced, the air pressure is increased and discharged through a valve. SINGLE-STAGE AIR COMPRESSOR: A type of reciprocating air compressor where compression of the air is done in one stage, or one stroke of the piston. In this case pressure is normally limited to 100 to 125 psi. The efficiency is low and the horsepower is normally high. Single- stage is mostly limited to compressors five horsepower and smaller, and are also considered light duty compressors due to the higher heat of compression (compressing air in one stroke of the piston or one-stage). Typically, single-stage models are not the compressors of choice for industrial applications. TWO-STAGE AIR COMPRESSOR: A type of reciprocating air compressor where total pressure is reached in two stages. This means that there are a minimum of two cylinders, one low pressure and one high pressure. Air is taken into the low-pressure cylinder, compressed to a pre-set inter-stage pressure, cooled, and put into the high-pressure cylinder for further compression to the final pressure. Two-stage compressors operate easily from discharge pressures of 100 psi up to pressures as high as 250 psi or greater. Efficiency is much higher than single-stage units, horsepower per cubic foot is lower and the compressor operates with much less heat as well. Two-stage compressors are normally used for industrial applications, or where higher pressure is required or to allow more air to be stored for future use. ROTARY SCREW AIR COMPRESSOR: With this type of air compressor, air is taken into the intake port of the compressor. There are two helical screw rotors; one has four male rotors and the other normally has six female flutes. The housing or cylinder reduces in size from intake to discharge therefore as the air is trapped between the rotors and moves toward the discharge, the area is reduced thus the air is compressed. There are no valves or pistons present in the screw compressor. Source : Champion, A Gardner Denver Company AIR COMPRESSOR SIZING AIR TOOLS CFM PSI Grease Gun 4 90 Hoist/Lift 6 150 1/2" Impact Wrench 3 90 3/4" Impact Wrench 7 90 Tire Changer w/ Inflator 4 100 Grease Gun 4 90 Oil Pump 4 90 Air Jack 4 90 6" Grinder 10 90 Panel Cutter 8 90 Plasma Cutter 9 90 Touch-up Spray Gun 4 90 Cut Off Tool 4 90 Engine Cleaning Gun 4 90 3/8" Air Drill 4 90 NOTE: The above listed air requirements are industry averages. Some tools may vary in their air requirements. Check the operator manual for the air requirements for your tools. Air compressors are continually undersized because the wrong criteria are used during the sizing process. Most people think of horsepower when selecting the compressor for their application. This will result in an approximation of the size of air compressor needed. However, further research is needed to properly size the compressor resulting in a satisfied customer. Ft 3 /min delivery (output) is the major factor to be considered. Every tool has a rated CFM and pressure requirement identified by the manufacturer. EXAMPLE: A " impact wrench requires 7 ft 3 /min @ 90 psig. When properly sizing an air compressor, this requirement must be considered. The rating of each and every tool being operated on the system has to be totaled to determine the system requirements. EXAMPLE: A tire repair shop has three vehicle bays. Each bay has a tire changer, a " impact wrench and a car hoist. The tire changer requires 4 ft 3 /min @ 100 psi, the " impact wrench requires 3 ft 3 /min @ 90 psi and the car hoist requires 6 ft 3 /min @ 150 psi. The total air required per bay is 13 ft 3 /min. There are a total of three bays; therefore, the total air requirement is 39 ft 3 /min. The greatest pressure requirement is the car hoist @ 150 psi. Therefore, the total requirement is 39 ft 3 /min @ 150 psi. The air compressor in this example has been sized for a total requirement or 100% duty cycle (percent of full load allowed for acceptable life of critical parts). If your air compressor is rated at 70% duty cycle, you must factor this in when you are determining the load profile of the system. Source: Champion, A Gardner Denver Company Air Compressors & Accessories Air compressors are devices that increase the pressure of a gas by mechanically decreasing its volume. These products ultimately convert mechanical or electrical energy provided by a prime mover such as a motor, into compressed air. Air compressors provide the power source to operate tools, valves, pumps, cylinders and a variety of other components in industrial applications. There are three different types of air compressors, which include reciprocating, rotary and centrifugal compressors. Compressors can either be stationary or portable, electric-driven or gas-driven and may stand either upright or horizontal. Reciprocating compressors are a common type of positive displacement air compressor, and can be used when air is needed only on an intermittent basis. These types of compressors are available either as air-cooled or water-cooled in lubricated and non-lubricated configurations. Cubic feet per minute (CFM) is the rate at which an air compressor can deliver a volume of air. CFM, not horsepower, actually defines the compressor capability. Both cfm and psi ratings are important when choosing a compressor, as they determine the types of tools that the compressor can drive.

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