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.