CHAPTER 6COMPRESSED AIR SYSTEMSIn the EN3 TRAMAN, we learned about the typesrequired to supply air of adequate volume, quality, andof air compressors that an Engineman is required topressure at the various points of applications. Thisoperate. We also learned how the air is compressed; thesupply of air is measured as pounds per square inchrequirements and methods of providing oil-free air; howgauge (psig). Air compressor plants or systems aremoisture is removed from the air; and some of the safetyclassified as low-pressure (0 to 150 psig),precautions used when operating or working withmedium-pressure (151 to 1,000 psig), or high-pressurecompressed air systems.(1,000 psig and above).This chapter contains general information aboutmaintenance and repair of compressed air systems. Youshould refer to the appropriate manufacturer’s technicalmanuals, maintenance requirements (3-M), and variousinformation books for more specific information. NavalShips’ Technical Manual, Chapter 551, “CompressedAir Plants and Systems,” is one good source ofinformation.Aboard Navy vessels, the A division or repairdivision is responsible for maintenance and repair ofcompressed air systems.LOW-PRESSURE SYSTEMSAIR SYSTEMSCompressed air is a form of power that has manyimportant uses. An air compressor plant (fig. 6-1) isLow-pressure (LP) systems provide compressed airup to 150 psig pressure. For branches requiring lowerpressures, pressure is usually reduced at reducingstations. The following list contains examples of airpressure requirements for LP air:Figure 6-1.—Typical components of a compressed air system.6-1
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