Miscellaneous Mechanical ComponentsDOE-HDBK-1018/2-93AIR COMPRESSORSCoolers used on the discharge of a compressor are called aftercoolers. Their purpose is toremove the heat generated during the compression of the air. The decrease in temperaturepromotes the condensing of any moisture present in the compressed air. This moisture iscollected in condensate traps that are either automatically or manually drained. If the compressor is multi-staged, there may be an intercooler, which is usually located after thefirst stage discharge and before the second stage suction. The principle of the intercooler is thesame as that of the aftercoolers. The result is drier, cooler, compressed air. The structure ofa particular cooler depends on the pressure and volume of the air it cools. Figure 7 illustratesa typical compressor air cooler. Air coolers are used because drier compressed air helps preventcorrosion and cooler compressed air allows more air to be compressed for a set volume. Figure 7 Compressor Air CoolerHazardsofCompressedAirPeople often lack respect for the power in compressed air because air is so common and is oftenviewed as harmless. At sufficient pressures, compressed air can cause serious damage if handledincorrectly. To minimize the hazards of working with compressed air, all safety precautionsshould be followed closely.Small leaks or breaks in the compressed air system can cause minute particles to be blown atextremely high speeds. Always wear safety glasses when working in the vicinity of anycompressed air system. Safety goggles are recommended if contact lenses are worn.Compressors can make an exceptional amount of noise while running. The noise of thecompressor, in addition to the drain valves lifting, creates enough noise to require hearingprotection. The area around compressors should normally be posted as a hearing protectionzone.Rev. 0ME-05Page 7
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