Centrifugal Pump



Defination
A machine for moving a liquid, such as water, by accelerating it radially outward in an impeller to a surrounding volute casing.
A Centrifugal pump have a high-speed rotating impeller whose blades throw the water outwards.

Energy usage

The energy usage in a pumping installation is determined by the flow required, the height lifted and the length and friction characteristics of the pipeline. The power required to drive a pump (Pi), is defined simply using SI units by

P_i= \cfrac{\rho\ g\ H\ Q}{\eta}

where:
Pi is the input power required (W)
ρ is the fluid density (kg/m3)
g is the standard acceleration of gravity (9.80665 m/s2)
H is the energy Head added to the flow (m)
Q is the flow rate (m3/s)
η is the efficiency of the pump plant as a decimal

Pump Efficiency

Pump efficiency, η (%) is a measure of the efficiency with wich the pump transfers useful work to the fluid.
η = Pin/Pout   (2)
where 
η = efficiency (%)
Pin = power input
Pout = power output  

 Different types of pump head
  • Total Static Head -  Total head when the pump is not running
  • Total Dynamic Head (Total System Head) - Total head when the pump is running
  • Static Suction Head - Head on the suction side, with pump off, if the head is higher than the pump impeller
  • Static Suction Lift - Head on the suction side, with pump off, if the head is lower than the pump impeller
  • Static Discharge Head - Head on discharge side of pump with the pump off
  • Dynamic Suction Head/Lift - Head on suction side of pump with pump on
  • Dynamic Discharge Head - Head on discharge side of pump with pump on

Problems of centrifugal pumps

  • Cavitation—the NPSH of the system is too low for the selected pump
  • Wear of the Impeller—can be worsened by suspended solids
  • Corrosion inside the pump- caused by the fluid properties
  • Overheating due to low flow
  • Leakage along rotating shaft
  • Lack of prime—centrifugal pumps must be filled (with the fluid to be pumped) in order to operate
  • Surge 

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4 comments:

  1. Fluid sucked trough impeller eye and discharge @ 90 degree angle

    ReplyDelete
  2. Centrifugal pumps, are a sub-class of dynamic axisymmetric work-absorbing turbo machinery. Centrifugal pumps are used to transport liquids/fluids by the conversion of the rotational kinetic energy to the hydro dynamics energy of the liquid flow.

    thanks a lot for sharing

    ReplyDelete
  3. hey nice information for us,Buy Malhar Centrifugal Pump. Get best and cheap prices from Centrifugal Pump Manufacturers on SS Centrifugal Pump with installation guide of Centrifugal Pumps in India.

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    ReplyDelete
  4. Hi,
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    ReplyDelete

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