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How to Choose Best Slurry Pump ？

29 Apr.,2024

How to Choose Best Slurry Pump ？

Here are some key considerations to guide your selection process when choosing the best slurry pump for a specific application:

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Application Requirements: Understand the specific requirements of your slurry pumping application. Consider factors such as the type and characteristics of the slurry (e.g., particle size, density, viscosity), required flow rate, total head, and the distance over which the slurry needs to be pumped.

Pump Type: Different types of slurry pumps are available, including centrifugal pumps, submersible pumps, and positive displacement pumps. Each type has its advantages and limitations. Centrifugal pumps are commonly used in slurry applications due to their efficiency and ability to handle high flow rates. Submersible pumps are suitable for pumping slurries from submerged locations. Positive displacement pumps can handle high-viscosity slurries or those containing large solids.

Construction Materials: Slurry pumps need to be constructed with materials that can withstand the abrasive and corrosive nature of the slurry being pumped. Consider the compatibility of the pump's wetted parts (impeller, volute, casing) with the slurry composition. Materials such as high-chrome alloys, rubber, or polyurethane may be used for wear resistance

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Solids Handling Capability: Evaluate the pump's ability to handle solids present in the slurry. Look for features such as large passages, agitators, or special designs that prevent clogging or excessive wear.

Efficiency and Operating Costs: Consider the pump's efficiency to ensure optimal energy usage and lower operating costs. Look for pumps with high hydraulic efficiencies and consider the power requirements for your application.

Manufacturer and Reputation: Choose a reputable manufacturer with a track record of producing reliable and high-quality slurry pumps. Consider factors such as after-sales support, warranty, and availability of spare parts.

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Maintenance and Serviceability: Assess the ease of maintenance and serviceability of the pump. Look for features such as easy access to components, replaceable wear parts, and availability of maintenance guidelines.

Budget Considerations: Consider the upfront cost of the pump as well as the long-term operating and maintenance costs. Balance the initial investment with the expected performance and durability of the pump.

Pump Size and Capacity: Consider the physical size and capacity of the pump. Ensure that the pump's size and flow capacity match the requirements of your application. Oversized or undersized pumps may lead to inefficiencies or operational issues.

Pump Head and Pressure: Evaluate the pump's head and pressure capabilities. The pump should be able to provide sufficient pressure to overcome the resistance in the pipeline system and deliver the slurry to the desired location.

Sealing and Leakage Prevention: Slurry pumps operate in demanding conditions, and proper sealing is crucial to prevent leakage. Look for pumps with effective sealing mechanisms such as mechanical seals or gland packing to minimize the risk of leakage.

Pump Reliability and Durability: Choose a pump that is known for its reliability and durability. Consider factors such as the pump's design features, robust construction, and the quality of materials used. A reliable pump will minimize downtime and maintenance costs.

Operational Flexibility: Assess whether the pump offers operational flexibility to adapt to varying slurry conditions, flow rates, or operational requirements. Some pumps may have adjustable impellers or speed controls to optimize performance.

Energy Efficiency: Energy consumption can be a significant operating cost when using slurry pumps. Look for pumps that are designed for energy efficiency, with features such as optimized impeller designs or variable speed drives that can help reduce power consumption.

System Integration: Consider the compatibility and ease of integration with your existing system or equipment. Ensure that the pump can be seamlessly integrated into your slurry handling system without significant modifications or disruptions.

Expert Advice and Support: If you are unsure about the selection process, seek advice from pump manufacturers, distributors, or industry experts. They can provide guidance based on their experience and knowledge to help you choose the best slurry pump for your specific application.

Remember that selecting the best slurry pump involves considering the unique requirements of your application and balancing factors such as performance, durability, cost, and support.

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A Beginner's Guide To Pumping Slurry

Centrifugal Pumps for Slurry

Slurry is one of the most challenging fluids to move. It's highly abrasive, thick, sometimes corrosive, and contains a high concentration of solids. No doubt about it, slurry is tough on pumps. But selecting the right centrifugal pump for these abrasive applications can make all the difference in the long-term performance.

WHAT IS A "SLURRY"?

Slurry is any mixture of fluid and fine solid particles. Examples of slurries would include: manure, cement, starch, or coal suspended in water. Slurries are used as a convenient way to handle solids in mining, steel processing, foundries, power generation, and most recently, the Frac Sand mining industry.

Slurries generally behave the same way as thick, viscous fluids, flowing under gravity, but also pumped as needed. Slurries are divided into two general categories: non-settling or settling.

Non-settling slurries consist of very fine particles, which give the illusion of increased apparent viscosity. These slurries usually have low wearing properties, but do require very careful consideration when selecting the right pump because they do not behave in the same manner as a normal liquid does.

Settling slurries are formed by coarse particles that tend to form an unstable mixture. Particular attention should be given to flow and power calculations when selecting a pump. The majority of slurry applications are made up of coarse particles and because of this, have higher wear properties.

Below are common characteristics of slurries:

Abrasive
Thick consistency
Can contain a high amount of solids
Usually settle quickly
Require more power to operate than a “water” pump

SLURRY PUMP SELECTION

Many types of pumps are used for pumping slurries, but the most common slurry pump is the centrifugal pump. The centrifugal slurry pump uses the centrifugal force generated by a rotating impeller to impact kinetic energy to the slurry, similar to how a water-like liquid would move through a standard centrifugal pump.

Slurry applications greatly reduce the expected wear life of pumping components. It’s critical that pumps designed for these heavy-duty applications are selected from the start. Consider the following when making selections:

BASIC PUMP COMPONENTS

To ensure the pump will hold up against abrasive wear, the impeller size/design, material of construction, and discharge configurations must be properly selected.

Open impellers are the most common on slurry pumps because they’re the least likely to clog. Closed impellers on the other hand are the most likely to clog and the most difficult to clean if they clog.

Slurry impellers are large and thick. This helps them operate longer in harsh slurry mixtures.

SLURRY PUMP CONSTRUCTION

Slurry pumps are generally larger in size when compared to low-viscosity liquid pumps and usually require more horsepower to operate because they're less efficient. Bearings and shafts must be more rugged and rigid as well.

To protect the pump’s casing from abrasion, slurry pumps are oftentimes lined with metal or rubber. Goulds Pumps, for example, lines their XHD (Extra Heavy Duty) slurry pump with rubber.

Metal casings are composed of hard alloys. These casings are built to withstand the erosion caused by increased pressure and circulation.

The casings are selected to suit the needs of the application. For instance, pumps used in cement production handle fine particles at low pressures. Therefore, a light construction casing is acceptable. If the pump is handling rocks, the pump casing and impeller will need a thicker and stronger casing.

SLURRY PUMPING CONSIDERATIONS

Those with experience pumping slurries know it's not an easy task. Slurries are heavy and difficult to pump. They cause excessive wear on pumps, their components, and are known to clog suction and discharge lines if not moving fast enough.

It’s a challenge to make slurry centrifugal pumps last for a reasonable amount of time. But, there are a few things you can do to extend the life of your slurry pump and make pumping slurry less of a challenge.

Find the sweet spot that allows the pump to run as slow as possible (to reduce wear), but fast enough to keep solids from settling and clogging the lines
To reduce wear, lower the pump’s discharge pressure to the lowest point possible
Follow proper piping principles to ensure a constant and uniform delivery of the slurry to the pump

Pumping slurries poses several challenges and problems, but with proper engineering and equipment selection, you can experience many years of worry-free operation. It's important to work with a qualified engineer when selecting a slurry pump because slurries can wreak havoc on a pump if not properly selected.

Check out the Must-Have Handbook for Centrifugal Pumps for more information on centrifugal pumps, including details about pumps specifically designed for slurry applications!

Expert Centrifugal Pump Insights from Crane Engineering

Engineers and experts rely on Crane Engineering for insight and help with centrifugal pumps to pump slurry. Our in-house team of engineers can answer questions related to not only pumps but valves and skid systems. We provide a complete service and repair team who will fix pumps back to OEM standards. We are ready to assist you, contact us, today if you're in Wisconsin, Minnesota, Iowa, North Dakota, South Dakota, and the Upper Peninsula of Michigan. Crane Engineering also builds and designs customized skid systems nationwide.

Let us know how we can help you, request a quote today!

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