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A single acting reciprocating pump lifts a liquid of specific weight 9.0 kN/m3 from a pressurized storage reservoir to an overhead container. The free surface in the supply reservoir is at an elevation of 3.5 m above the centre of the pump. The ambient pressure over the liquid surface in the supply reservoir is 27 kN/m2 (vacuum). The other relevant data relating to the pump are as follows:

         Length of the suction pipe = 6.0 m

         Diameter of suction pipe = 10 cm

         Minimum pressure anywhere in the system =27 kPa (abs)

         Length of stroke = 50 cm

         Diameter of cylinder = 20 cm

         Atmospheric pressure = 99 kN/m2 (abs)

         Determine the maximum speed admissible in rpm.       

     

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