Quantcast Chapter 6 Prime Movers, Pumps and Air Compressors

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CHAPTER  6 PRIME MOVERS, PUMPS, AND AIR COMPRESSORS LEARNING OBJECTIVE: Identify types and uses of prime movers, pumps, and air compressors; identify procedures required in preventive maintenance and maintenance on pumps and air compressors. Because of the many types of prime movers, pumps, and air compressors used by Navy units, the information  presented  on  operating  procedures  and maintenance requirements in this chapter is brief and general.  The  emphasis  is  on  fundamental  operating principles, parts, and maintenance of prime movers, pumps,  and  air  compressors,  and  operating  problems you may experience. Local   commands   develop   specific   operator maintenance schedules, logs, and reports. Each local command also maintains a file of manufacturer‘s instructions, parts lists, drawings, and diagrams for all equipment installed or used in that command. Taken together, these maintenance schedules, manufacturer’s instructions, and so on, provide you with detailed information on operating procedures and maintenance requirements. Always get to know these guides before attempting to operate and maintain the equipment for which you are responsible. There   are   several   important   Navy   training publications of which you need to be aware. Although these  books  are  described  as  basic  texts,  the information  they  contain  can  help  you  better understand the equipment covered in this chapter. To learn  more  about  the  operating  principles  and construction of electric motors, you should obtain a copy of each of the following TRAMANs: Module  5,  Introduction  to  Generators  and Motors,  Navy  Electricity  and  Electronics Training  Series  (NEETS),  NAVEDTRA B72-05-00-96. Basic Machines, NAVEDTRA 12199, explains the operating principles and construction of internal  combustion  engines. Fluid Power, NAVEDTRA 12966, discusses fluid  physics,  construction,  and  operating principles of pumps and air compressors, valves, packing, pressure gauges, and fluid piping, tubing, and temperature. PRIME MOVERS LEARNING  OBJECTIVE:  Identify  the  basic types, the operation, and the maintenance of prime movers. Prime movers are often called “driving equip- ment”  because  they  are  the  primary  source  of mechanical  energy  or  power.  The  mechanical  energy produced by the prime mover is transmitted to another machine  or  mechanism,  such  as  a  pump  or  air compressor, to do some form of useful work. The mechanism, or linkage, that transmits the mechanical power developed by the prime mover is called the drive. Electric motors and internal combustion engines are commonly used as prime movers. For this reason, this chapter briefly covers electric prime movers, gasoline-operated  prime  movers,  and  diesel-operated prime movers. ELECTRIC MOTORS As  prime  movers,   electric  motors  receive electrical  energy  from  some  external  source  and transform it into the mechanical energy needed to produce  work.  Electric  motors  are  either  direct  current (dc) or alternating current (ac). Because most of the electrical  power  generating  systems  that  Seabees  come in contact with produces alternating current, only the ac motor will be discussed. Induction AC Motor Of  the  various  types  of  ac  motors  available, you  will  work  primarily  with  the  rotating-field INDUCTION ac motor. The popularity of this motor is 6-1



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