CHAPTER 11 COMPRESSED AIR SYSTEMS

The Utilitiesman is involved in the installation of compressed air systems. The senior UT must be capable of identifying and directing the proper construction techniques for installation of fittings and components. You will also be involved in the maintenance of systems installed previously. In this chapter compressed air systems and air quality requirements are also discussed.

SYSTEM CLASSIFICATIONS

Compressed air is a form of power that has many important uses in industrial activities. An air compressor plant (fig. 11-1) is required to supply air of adequate volume, quality, and pressure at the various points of application. Compressed air is stated as pounds per square inch gauge (psig). These plants or systems are classified as

Figure 11-1.-Components of a compressed air plant.

low-pressure (0 to 125 psig), medium-pressure ( 126 to 399 psig), or high-pressure (400 to 6,000 psig) systems.

LOW-PRESSURE SYSTEMS

Low-pressure systems provide compressed air up to 125 psig pressure. When you are installing a low-pressure system, pressure is usually reduced at reducing stations for branches requiring lower pressures. Several air pressure requirements for low-pressure air consumers are listed below:

MEDIUM-PRESSURE SYSTEMS

Medium-pressure systems provide compressed air within the range of 126 to 399 psig pressure. These systems are not extensive and are generally provided with individual compressors located near the loads. Medium-pressure systems are mainly used for the starting of diesel engines, soot blowing of boilers and high-temperature water (HTW) generators, and hydraulic lifts.

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