Page 259 - Know and Understand Centrifugal Pumps
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Know and Understand Centrifugal Pumps


        AIR ASPIRATES       PUMP
        THROUGHTHE        DISCHARGE    SUCTION
          PACKING      - 1             BY-PASS
            \

























        Figure 17-9

         Avoid  high  speed  suction  flow  (Figure  17-9).  This  causes  air
         entrainment. Also, a high suction lifi produces the same effect.

                 I           I                               I





















       Figure 17-10
                              ~~
         These  are  the  dimensions  to  respect  for  proper  sump  design  (Figure
         17-10). The submergence laws are independent of the pumps NPSHr.
         The submergence laws are presented later in this chapter.


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