The importance of data can easily be overlooked especially with a pump that is already installed and has been running on its calculated duty point for some time. As sites develop, it is normal for duty points to change as manufacturing fluctuates to the market demand. An increase in flow may not be considered a major factor on some equipment, but when it comes to a pump it can push its operation from the most efficient point toward a critical range. There are other factors that can have detrimental impacts such as changes in the feed material and installation alterations to pipework like lengths, dimensions, and others. This can result in an increase in friction losses in the system.
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The reason pumps like to work at its most efficient point is because this reduces the amount of wear seen, ultimately extending the service life. It is well known in the industry that slurry pumps will not be able to run forever due to the nature of its work. But every mine aims to extend this life as much as possible, which happens by being as close to BEP as possible.
Small adjustments in flow or head can move the duty point on the curve considerably has and have implications on wear life. Moving further to the left of BEP, usually due to a reduction of flow or head, creating recirculation in the pump meaning the material travels around the casing excessively before it is moved down the line. This creates additional wear due to the extra circulation of particles.
Alternatively, the duty point can be pushed to the right of BEP by increasing the flow. This can cause issues with inlet velocity meaning the flow into the pump is greater than the installed size that the pump can manage. And resulting in increased wear rate around the discharge area of the casing and on the eye of the impeller, which is the first obstruction the flow finds when entering the pump.
In some of these cases a pump can be adjusted on speed to help deal with the changes of duty, but in other cases it would be recommended to change the pump size to best fit the altered application. Without taking these changes into consideration, a previously well performing pump can turn into a maintenance headache.
Another factor to keep in mind is that as a pump wears and moves away from its optimum point it has a reflective effect on the power consumption. An increase in power consumption turns into an increase in costs and carbon footprint.
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Jul 13,
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In industries such as mining, wastewater treatment, and construction, the handling of slurries is a common requirement. Slurries consist of solid particles suspended in a liquid medium, presenting unique challenges for pumping systems. Selecting the right slurry pump is crucial to ensure efficient and reliable operation. In this article, we will provide valuable tips for choosing the appropriate slurry pump based on the particle size and concentration of the slurry, enabling optimal performance and longevity of the pumping system.
Particle size refers to the dimensions of the solid particles present in the slurry. It is typically measured in micrometers (µm) or millimeters (mm). The particle size distribution can vary significantly, ranging from fine particles of a few micrometers to larger particles of several millimeters. Understanding the particle size distribution is vital as it directly influences the pump&#;s performance and selection.
Concentration, also known as solid content or solids concentration, refers to the proportion of solid particles in the slurry by volume or weight. It is typically expressed as a percentage. Concentration levels can vary widely depending on the application, ranging from low concentrations of a few percent to high concentrations exceeding 50%.
Before selecting a slurry pump, it is crucial to analyze the particle size distribution of the slurry. This information helps determine the pump&#;s handling capabilities and ensures that it can accommodate the range of particle sizes present. Consider factors such as the maximum particle size, the presence of fine or abrasive particles, and any potential variations in the particle size distribution.
The concentration of the slurry influences the pump&#;s ability to handle the solids efficiently. Higher concentrations often require pumps specifically designed for handling dense slurries. It is important to select a pump that can handle the desired concentration without excessive wear or clogging issues. Consider the maximum concentration expected and consult the pump manufacturer&#;s guidelines for appropriate pump selections.
The impeller is a critical component of a slurry pump and plays a significant role in handling various particle sizes and concentrations. Different impeller designs are available, each suitable for specific applications. For example, open impellers are generally better suited for handling larger particles, while closed or semi-open impellers are more efficient for higher concentrations and finer particles. Consider the pump&#;s impeller design and ensure it aligns with the slurry&#;s characteristics.
Slurries with abrasive or corrosive particles can cause rapid wear and deterioration of pump components. When selecting a slurry pump, consider the materials used for construction. Materials such as high-chrome alloys, rubber, or ceramic coatings offer enhanced wear and corrosion resistance, ensuring prolonged pump life and reduced maintenance requirements.
The pump&#;s configuration and operating conditions should match the specific requirements of the slurry application. Consider factors such as flow rate, head (pressure), and the required power supply. Additionally, assess the pump&#;s ability to handle variable conditions, such as fluctuations in particle size or concentration, as some applications may experience changes over time.
Selecting the right slurry pump based on particle size and concentration is crucial for ensuring efficient and reliable operation in industries handling slurries. By understanding the particle size distribution, evaluating the slurry&#;s concentration, assessing impeller design, considering wear and corrosion resistance, and evaluating pump configuration and operating conditions, you can make an informed decision. Consulting with pump manufacturers or experts in slurry handling can provide valuable insights and assistance in selecting the most suitable pump for your specific application.
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