CHAPTER 7AUXILIARY MACHINERYInformation related to much of the auxiliarymachinery aboard ship is provided in Engineman3 & 2, NAVEDTRA 10541 (current revision).This chapter provides additional information onthe care and maintenance of compressed airsystems and equipment, auxiliary boilers,hydraulic systems, distilling plants and pressurevalves.COMPRESSED AIR SYSTEMSQualifications for lower rates require that youknow not only the purpose and principles in-volved, but also the operation and performanceof routine maintenance on many auxiliary systemsand units which use compressed air. As an EN,you have already used compressed air for suchjobs as starting diesel engines, blowing out andcleaning various units, and operating numerouspneumatic tools. When working with any of thethree types of compressed air systems (low,medium, and high pressure), you have probablyfound that the principal source of many troublesis to be found in the compressor. Even thoughthe design and capacity of compressors vary, themaintenance procedures are essentially the samefor all of them. However, the care andmaintenance of high pressure compressors requireadditional safety precautions and adherence toprocedures recommended by the manufacturer.Because of your past experience, parts of thefollowing discussion will serve only as a review,while other portions of the discussion will benefityou in your study for advancement, and will behelpful when you are called upon to train others.To avoid unnecessary damage to equipment,always use proper tools and take all necessaryprecautions. The correct use of proper toolsshould be kept constantly in mind when a machineof any kind is being serviced. Remember, the im-proper use of tools and methods may cause seriouscasualties to both machinery and personnel.Although rugged and dependable, modernauxiliary machinery is not designed to withstandabusive treatment. Gasketed joints, pipe joints,and bolts are designed to safely withstand thestrain required for a tight connection when thespecified torque is applied with the correct tool.Whenever a joint or bolt cannot be tightenedwithout the use of an oversized wrench or wrenchhandle extension, there is usually somethingwrong with the assembly.Pounding on a wrench to acquire additionalforce usually results in damage to the equipment.Use of a wrench extension is likely to distort thegasketed surface or twist off the bolt withoutachieving a tight joint. The application of anyforce in excess of the force prescribed usuallyresults in breakage.CARE AND MAINTENANCE OFAIR COMPRESSORSTo keep the ship’s air compressors operatingefficiently at all times and to prevent as manytroubles as possible, it is necessary to know howto care for air intakes and filters; how to main-tain and replace air valves; how to take care ofair cylinders, pistons, and wrist pins; how toadjust bearings and couplings; and how toproperly maintain the lubrication, the cooling, thecontrol, and the air systems.Air Intakes andIntake FiltersThe satisfactory operation of any compressoris based on a supply of clean, cool, dry air. To7-1
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