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Page Title: d. Leakage Definitions for Operator PMCS.
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TM 9-4110-257-14 d. Leakage Definitions for Operator PMCS.  It is necessary for you to know how fluid leakage affects the status of your refrigeration unit.  The following are types/classes of leakages an operator needs to know to be able to determine the status of their unit.  When in doubt notify your supervisor. (1) Refrigerant Leaks.  Oil is carried with the refrigerant as it flows through the refrigeration system.  If a leak develops in the system, the oil will seep out and soak the copper tubing around the leak or drip and soak or puddle on  the  housing  or  other  component  below  the  leak.    If  any  oil  or  seepage  is  found,  a  refrigerant  leak  would  be suspected. WARNING The accumulation of liquid fuel is a fire hazard. (2) Engine Fuel Leaks.  Fuel is carried from the fuel tank, through filters, into the engine, and back to the fuel tank through various rubber hoses and fittings.  If a leak develops, the fuel will seep out and soak the hose or fitting around the leak and may drip and soak or puddle on the housing or other component below the leak.  If any fuel seepage is found, a leak would be suspected. (a) Wipe and wash down such areas or surfaces promptly. (b) Dispose  of  any  wiping  rags  in  approved  containers.    Contact  your  local  environmental  officer  for guidance on how to properly dispose of fuel soaked wiping rags in accordance with local regulations. (c) Apply no smoking rules within 50 ft of any fuel accumulation. (3) Engine Lubricating Oil Leaks.  Engine lubricating oil is carried from the engine, through filters, and back to the engine through various rubber hoses and fittings.  If a leak develops, the oil will seep out and soak the hose or fitting around the leak and may drip and soak or puddle on the housing or other component below the leak.  If any oil seepage is found, a leak would be suspected. CAUTION The refrigeration unit will not be operated with an obvious fuel leak. Operation is allowable with minor leakages (class I or II) in the engine lubricating  oil  system.    Consideration  must  be  given  to  oil  capacity  in the engine. When operating with class I or II oil leaks, continue to check oil level as required in your PMCS. Class  III  oil  leaks  should  be  reported  immediately  to  your  supervisor and the unit must be shut down. (a)  Class  I  leak  is  defined  as  seepage  of  fluid  as  indicated  by  wetness  or  discoloration  but  not  great enough to form drops. (b) Class II leak is defined as leakage of fluid great enough to form drops but not enough to cause drops to drip from item being checked/inspected. (c)  Class  III  leak  is  defined  as  leakage  of  fluid  great  enough  to  form  drops  that  fall  from  item  being checked/inspected. 2-7

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