Difference between different types impeller (Open , Semi Open , Close)

 Difference between different types impeller (Open, Semi-Open , Close)

Open Impeller:

Those impellers vanes which are open on both sides and have no wall surrounding the vanes.
Application: Used as a pump where workload is low and fluid contains abrasive particles.Note: these impellers less prone to clog or particle   blockage 

Advantage :
  1. Easy to clean
  2. Easy to repair
  3. Faster
  4. Can handle suspended Solids
Disadvantage:
  1. Only good for smaller load work
  2. Low efficiency
  3. Required high NPSH(net positive suction head) to reduce cavitation effect


Semi-Open Impeller:

Those impellers vanes which are open on both sides and have wall surrounding the vanes.

Application: Use for the medium workload. It can also handle mud or abrasive particle in the fluid. This impeller efficiency is in between close and open impeller

Advantage :
  1. Used with fluid have dirt  abrasive particle
  2. Higher-strength as compare to open impeller
  3. Better efficiency as compare to open impeller
Disadvantage:
  1. Clearance between the vanes and casing must be small else large slippage and recirculation will occur
  2. Low efficiency as compare to close impeller

Close Impeller:

These impeller vanes have have a wall on both sides (front and back) .It increase its strength

Application: These impellers are used for heavy workload and Commonly used with clean liquid (water treatment plant or other  industry dealing with liquid )

Advantage:
  1. High efficiency as compare to open and semi open impeller
  2. Provide more flow at low NPSH(Net positive suction head)
  3. Give constant efficiency during work
Disadvantage:
  1.  Complex Design
  2. Expensive (high maintenance  and making  cost)
  3. More Prone to clogging
  4. Not suitable for abrasive fluids








Post a Comment

0 Comments