We get asked many questions about Centrifugal Water Pumps by our customers, as they are widely used in South Africa.
When you need to move clean water, hot water, or light industrial liquids (without aggressive chemicals), these types of pumps are commonly used. For both domestic and industrial applications.
These are some of the questions people often ask us:
- What is a centrifugal water pump and how does it work?
- What is the difference between a centrifugal water pump and a “normal pump”?
- What are the advantages and disadvantages?
- Where are centrifugal water pumps used?
- What types of centrifugal water pumps are there?
- How long does a centrifugal water pump last?
Let’s dive right in and answer them.
What Is a Centrifugal Water Pump?
A centrifugal water pump uses a rotating impeller to move water through the pump and convert rotational energy into kinetic energy.
This design allows the pump to transfer large volumes of water efficiently.
How it works:
- Water enters the pump through the suction inlet.
- The impeller spins, creating centrifugal force.
- The force pushes water out through the discharge outlet at high speed.
– the single impeller Calpeda NM and NMD is used for water supply; or in heating, cooling and circulation plants.
What Is the Difference Between a Centrifugal Water Pump and a “Normal Pump”?
When people talk about a “normal pump” they’re usually thinking of a piston-type pump, which is known as a displacement pump. (Bearing in mind that there are also other pump types such as reciprocating, diaphragm, or peristaltic pumps.)
The main difference lies in the pumping mechanism:
- Centrifugal pump – Uses a rotating impeller and is ideal for continuous, high-flow applications.
- Positive displacement pump (piston type) – Moves a fixed amount of fluid with each stroke, suited to high-pressure, low-flow applications.
Advantages of a Centrifugal Water Pump
- High flow capacity – Can move large volumes quickly.
- Simple design – Easy to operate and maintain.
- Versatility – Suitable for clean water, hot water, and certain chemicals.
- Cost-effective – Affordable compared to many other pump types.
Disadvantages of a Centrifugal Water Pump
- Not suitable for very viscous liquids.
- Requires priming unless it’s a self-priming model.
- Efficiency can drop if not operated near its design point.
What Are Centrifugal Water Pumps Used For?
Centrifugal pumps are used across industries and in homes because they move clean water efficiently.
- Residential Uses:
Domestic water supply and pressure boosting, irrigation, pool water circulation. - Commercial Uses:
Water transfer in office buildings, hotels, and schools. Fire fighting pump applications. - Industrial Uses:
Treating water systems, cooling towers and systems, boiler feeds, non-abrasive liquids. - Agricultural Uses:
Crop irrigation, livestock watering.
Types of Centrifugal Water Pumps:
Cast Iron Centrifugal Water Pump
Known for strength and durability, these pumps are suitable for heavy-duty applications and can handle slightly abrasive liquids.
Centrifugal Pump for Hot Water
Designed with heat-resistant materials, these pumps can safely handle high-temperature fluids such as boiler feed water.
Self-Priming Centrifugal Water Pump
Capable of removing air from the suction line, making them ideal where water supply may not be continuous.
Pedrollo Centrifugal Water Pumps
Pedrollo is one of the trusted brands we recommend with centrifugal pumps for domestic, agricultural, and industrial use.
See prices for Centrifugal Water Pumps
Choosing the Right Centrifugal Water Pump
When selecting a pump, consider:
- Flow rate
- Type of liquid being pumped
- Temperature of the water
- Installation location and space
If you need a cast iron centrifugal water pump, a Pedrollo centrifugal water pump, or a centrifugal pump for hot water, it’s important to match the pump specifications to your application.
Centrifugal Water Pump Parts
Diagram of a centrifugal water pump parts
- Pump body – Houses the pump components and directs water flow
- Body back plate
- Impellers – Rotating fins that impart velocity to water
- Motor shaft – Connects the impeller to the motor
- Mechanical seal – Prevent leakage
- Bearings – Support the shaft and reduce friction
- Capacitor – provides extra starting torque
- Electric motor
* The above diagram shows an internal view of a Pedrollo centrifugal water pump’s parts
Spare Parts for centrifugal pumps
We keep stock of spare parts for most major brands of centrifugal pumps – including Dab, Ebara, Pentax, Pedrollo and Calpeda pumps. We also offer a repair service if need be.
Follow this link to go to Services and spare parts: https://www.afripumps.co.za/services/
How Long Does a Centrifugal Water Pump Last?
With proper installation and regular maintenance, a centrifugal water pump can last 10–15 years or more.
The Afripumps technical Manager says:
“A pump will wear out before it should if you don’t have the right head (height) and flow for an application.”
You need to get the right pump for what you need to do. We will help you help you choose the right pump for your specific situation (application).
Go here to ask advice or browse our online shop to find the best pump for your application.
