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�SUBJECT: TURBO MACHINES�

Unit-V

CENTRIFUGAL PUMPS

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Presented By

Mr. Shyam S. Darewar

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Centrifugal Pumps

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  • A pump is a hydraulic machine which converts the mechanical energy into hydraulic energy.
  • This hydraulic energy is in the form of pressure energy.
  • If mechanical energy converted into pressure energy is because of centrifugal action then pump is referred ‘Centrifugal Pump’.
  • For centrifugal pump the flow is in radial outward direction.
  • It works on the principle of vortex flow which means that when certain mass of liquid is rotated , the rise in pressure of the rotating liquid takes place.
  • The basic difference in turbine and pump is, in turbine the flow takes from the high pressure side to low pressure side whereas in pump flow takes place from low pressure side to high pressure side.
  • in turbine the flow is accelerated whereas in pump the flow is decelerated.

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Lecture -01 Unit-V– Centrifugal Pumps

Presented By- Mr. Shyam S. Darewar

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Centrifugal Pumps

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Strainer

Foot Valve

Suction Pipe

Delivery head (hd)

Suction head (hs)

Static head (Hs)

Vacuum Gauge

Delivery Gauge

Delivery Pipe

Delivery Valve

Pump Shaft

Impeller

Casing

Eye of an Impeller

Sump

Tank

Lecture -01 Unit-V– Centrifugal Pumps

Presented By- Mr. Shyam S. Darewar

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  • Advantages of Centrifugal Pump
  • Discharge capacity is higher than other pumps.
  • The performance characteristics are superior.
  • Can be coupled directly prime mover.
  • Can be operated at very high speeds.
  • Compact and small in size.
  • It has low cost.
  • Installation and maintenance are easier and cheaper.

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  • Applications of Centrifugal Pump
  • In steam and diesel power plant to circulate feed water and cooling water.
  • For pumping of water in building.
  • To pump water from source to field for agriculture and irrigation purposes.
  • To pump cooling water to large refrigeration and air-conditioning plant.
  • For lifting viscous liquids like paper pulp, muddy and sewage water, oil etc.
  • To pump water in fire trucks.
  • Chemical and process industries.

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Lecture -01 Unit-V– Centrifugal Pumps

Presented By- Mr. Shyam S. Darewar

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Classification of Centrifugal Pumps

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  • According to the type of casing
    1. Volute pump
    2. Turbine or diffused pump
    3. According to the working head
      1. Low head pumps (upto 15m)
      2. Medium head pumps (upto 40m)
      3. High head pump (above 40m)
      4. According to type of liquid handling
        1. Closed impeller pump
        2. Semi-open impeller pump
        3. Open impeller pump.

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        • According to the number of impellers used
          1. Single stage centrifugal pump
          2. Multistage centrifugal pump
          3. According to entrance to the impellers
            1. Single entry or single suction pump
            2. Double entry or double suction pump
            3. According to the direction of flow through impeller
              1. Radial flow pump
              2. Axial flow pump
              3. Mixed flow pump

Lecture -01 Unit-V– Centrifugal Pumps

Presented By- Mr. Shyam S. Darewar

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Thank You

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Lecture -01 Unit-V– Centrifugal Pumps

Presented By- Mr. Shyam S. Darewar