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Sunday, August 15, 2010

Typical Part of Centrifugal Pumps

 
A centrifugal pump is a relatively simple pump. Design, types and numbers of parts vary depending on centrifugal pump brand, type and configuration.
 
Typical main pump parts:
Casing/back plate:
  • Contains impeller where fluid is transferred from inlet to outlet.
  • Includes inlet and outlet ports.
  • Typically flexible port orientation.
  • Typically fitted to an adapter.
Shaft:
  • Rotates impeller which is fixed to it.
  • Is fixed to the motor and rotates with it.
  • Transfers fluid from inlet to outlet with increased capacity and pressure is fixed on the shaft and rotates with it.
  • Typical types are open, semi-open or closed.
Shaft seal:
  • Seals between rotating shaft and stationary casing.
  • Typically a mechanical seal, external or internal.
  • Typically available as single, single flushed and double flushed seal.
Adapter:
Fixes pump casing to the motor.
Motor:
  • Rotates shaft (impeller) which is fixed to it.
  • Typically a 3-phase electrical motor.
  • Typically available for various electrical site supplies (voltage and frequency).
  • Typically available in various protection classes (flameproof etc.).
Other parts: Seals, motor cover, seal flushing, coupling/ base (base-mounted pump).
Typical materials:
  • Steel parts of 316L or 304 stainless steel.
  • Elastomers of NBR, EPDM, FPM, PTFE.

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