Pump Type Follows:

Monday, December 22, 2008

Typical parts in a centrifugal pump

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/backplate:

  • 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.

Impeller:

  • 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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