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Cylinders and Pistons
Chapter 7 Laundry, Mess Deck, Galley, and Scullery Equipment

Engineman 2 - Intermediate engine mechanics training manual
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-  Keep  the  oil  cooler  free  from  leaks  (since pressure  on  the  water  side  exceeds  that  of  the  oil)  to prevent oil contamination and emulsification. - Properly adjust the lubricator for the specified quantity of oil feed. COOLING SYSTEM Proper  care  of  a  compressor  cooling  system includes  the  following  inspections  and  maintenance procedures: -  Periodically  inspect  the  intercoolers  and aftercoolers. -  Remove  collections  of  gummy  oils  or  tarry substances from the cooler tubes by washing tube nests with  a  suitable  solvent  and  drying  them  thoroughly before reassembling. - Correct any leakage in tube nests to prevent leaks  of  water  into  the  compressor  while  secured  or leaks of air into the water side during operation. -  Inspect  and  clean  the  cylinder  water  jackets periodically with a cleaning nozzle. When  filling  the  cooling  water  system  after  the compressor  has  been  drained,  open  the  water  inlet slightly to allow the water to rise slowly in the cooler shells and water jackets. Vent valves fitted to the water spaces  should  be  opened  to  permit  entrapped  air  to escape and to remove any air pockets. CONTROL DEVICES Because  of  the  great  variety  of  regulating  and unloading devices used on compressors, you will have to   consult   the   manufacturer’s   technical   manual   for information regarding the adjustment of these devices on particular compressors. If a control valve fails to work properly, it should be taken apart and cleaned Some valves are fitted with a filter  filled  with  a  sponge  or  woolen  yarn  to  prevent particles of dust or grit from being carried into the valve chamber. These filters remove gummy deposits from the oil used in the compressor cylinders. When repacking, use only genuine wool. Cotton will pack and stop the airflow.   Relief   valves   are   very   important   for   safe compressor operation. They should be set as specified by the manufacturer and lift-tested by hand each time the  compressor  is  placed  in  operation.  To  check  the setting periodically, test by raising the pressure in the spaces to which they are attached. SUMMARY Since an Engineman may encounter so many types of   compressed   air   systems,   air   dryers,   and   air compressors both ashore and aboard Navy vessels, this chapter  presented  only  general  procedures  and  facts.  To maintain, repair, and overhaul specific compressed air systems,  air  dryers,  or  reciprocating  air  compressors, you  must  refer  to  the  manufacturer’s  technical  manuals. A   definite   preventive   maintenance   schedule   with frequency and assignment of responsibility is required. You should have the manufacturer’s manual handy to establish   minimum   requirements   and   to   follow   its recommendations for maintenance. 6-10







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