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MAINTENANCE - 14104_152
FILTER/STRAINER   LOCATION

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plugs (fig. 9-38) also are used in some strainers to trap iron and steel particles carried by fluid. Studies have indicated that even particles as small as 1 to 5 microns have a degrading effect, causing failures and hastening deterioration in many cases. There will always be controversy over the exact definitions  of  filters  and  strainers.  In  the  past, many   such   devices   were   named   filters   but technically classed as strainers. To minimize the controversy,  the  National  Fluid  Power  Associa- tion  gives  us  these  definitions: FILTER  -  A  device  whose  primary  function is   the   retention,   by   some   porous   medium,   of insoluble  contaminants  from  a  fluid. STRAINER   -  A  coarse  filter. To put it simply, whether the device is a filter or a strainer, its function is to trap contaminants from  fluid  flowing  through  it.  The  term  porous medium  simply  refers  to  a  screen  or  filtering material that allows fluid flow through it but stops various  other  materials. MESH  AND  MICRON  RATINGS Filters, which may be made of many materials other  than  wire  screen,  are  rated  by  MICRON size.  A  micron  is  1-millionth  of  a  meter  or 39-millionths of an inch. For comparison, a grain of  salt  is  about  70  microns  across.  The  smallest particle  visible  to  the  naked  eye  is  about  40 microns.  Figure  9-39  shows  the  relationship  of Figure 9-39.—Relationship of micron sizes. 9-27






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