As a leading provider of fluid handling solutions, we’re committed to helping our clients understand and overcome common challenges in pump operations.  One challenge, that becomes a critical issue affecting pump performance and longevity is cavitation.

Cavitation in Pumps

Cavitation happens in pumps when the liquid being moved starts to boil because the pressure drops. While we typically associate boiling with high temperatures, it’s important to understand that liquids can also reach boiling point at lower temperatures if you reduce the pressure enough.

In a centrifugal pump, commonly used in industrial applications, there’s a significant pressure drop at the impeller’s eye. This low-pressure area can cause the liquid to boil, creating vapour bubbles. When these bubbles move to areas of higher pressure within the pump, they implode with a lot of energy sending out strong focused shockwaves. We call this process cavitation.

The Cavitation Process:

1. Pressure Drop: As liquid enters the pump, it experiences a pressure drop at the impeller’s eye.
2. Bubbles: If the pressure falls below the liquid’s vapour pressure, it starts boiling and creates vapour bubbles.
3. Implosion: These bubbles then move to higher-pressure areas within the pump and implode.
4. Damage: The implosions create shockwaves that can cause damage to pump components over time.

Symptoms of Cavitation

Recognising the signs of cavitation is key to maintaining pump efficiency and avoiding damage. Here are some key indicators:

1. Noise: You will hear it.  Cavitation is often described as bubbling, crackling, or gravel rattling around the pump housing or pipework.
2. Vibration: You may notice unusual vibrations while the pump is in operation.
3. Reduced Pressure: The discharge pressure will be lower than expected.
4. Power Fluctuations: More power might be needed to achieve the same throughput.
5. Debris in Output: You might notice small particles in the discharged liquid.

Prevention Techniques

At CDR Pumps (UK) Ltd, we recommend several strategies to prevent cavitation:

1. Proper Pump Sizing and Selection: Make sure that the pump you are using is the right pump for the job.  It needs to be the right size for its intended application. Cavitation often occurs when there’s a change in duty, so it’s worth talking to us when there are operational changes.
2. A well-designed system: Design fluid systems with smooth, unrestricted flow paths to minimise turbulence and pressure drops. Avoid sharp bends and sudden pipe diameter changes that can contribute to cavitation.
3. Inlet Flow Management: Install inlet flow straighteners or diffusers to distribute flow evenly, reduce turbulence, and increase pressure at the pump inlet.
4. Maintain Adequate NPSH: Net Positive Suction Head (NPSH) plays a key role in preventing cavitation. Ensure that the available NPSH exceeds the required NPSH.
5. Monitor the Process: Introduce real-time monitoring using flowmeters, vibration sensors, sound detectors, temperature sensors, or pressure sensors to keep track of operating conditions.
6. Regular Maintenance and Inspection: Carry out routine checks of pump components to identify and address potential cavitation issues early.

Making the Right Choice for Centrifugal Pumps

As experts in industrial pump solutions, CDR Pumps (UK) Ltd offers a wide range of high-quality pumps designed to meet diverse industrial needs. Our team of experienced engineers can help you select the right pump for your application, design optimal pumping systems, and provide ongoing support to ensure your pumps operate at peak efficiency.

We offer:

• Customised pump solutions
• Expert consultation on system design
• Comprehensive maintenance services
• Cutting-edge pump technology
• Ongoing technical support

And obviously, when you work with CDR Pumps (UK) Ltd, you gain access to our wealth of knowledge and experience in managing complex pumping challenges, including cavitation prevention and mitigation.

Stop Cavitation at its Source

Understanding and preventing cavitation is crucial for maintaining the efficiency and longevity of your industrial pumps. At CDR Pumps (UK) Ltd, we want to help our customers stay ahead of – and prevent – these challenges through expert advice, quality fluid handling solutions, and comprehensive support services.

Want to know more about how we can help with your industrial pumping needs?

Or maybe you’d like to talk about ways to stop cavitation in your specific setup?

Just give our team of experts a call. We’re here to help