Page 197 - Know and Understand Centrifugal Pumps
P. 197

M ech a n i ca I


                               Seals













        Pump packing

          Many industrial pumps around the world still use ring packing  as the
          shaft seal. These packings require continual maintenance. They need to
          be tightened and adjusted and it is necessary to change them frequently.
          Packings  wear  and  damage  the  shaft  or  sleeve  of  the  pump,  which
          necessitates their  frequent replacement. The leakage fiom the packing
          gland  corrodes  the  pump,  base  plate  and  foundation.  The  drips  can
          enter into  the  bearings  and  contaminate  the  bearing  lubricant.  This
          sacrifices the life of the bearings.

          The  majority  of  existing  pumps  that  were  originally  designed  for
          packings  can  be  converted  to  use  mechanical  seals.  Consider  the
          following.  We  have  many  pumps  in  our  private  everyday  lives.
          Practically all are adapted to mechanical seals. The family car has about
          6 pumps with mechanical seals:
             The radiator water pump.
             The fuel pump.
             The oil pump.
             The power steering pump.
             The pump that sprays and cleans the windshield.

             The air conditioning compressor.
          Do you have two cars? Then you have about 12 pumps with seals. And
          in your house,  how many sealed pumps  do you  have? In the kitchen,
          mechanical seals are on the pump in  the dishwasher, the blender, the
          refrigerator  compressor, and  the garbage disposal under the sink. Do
          you have a clothes washer? There are two seals on the clothes washer,




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