Frequently Asked Questions for Your Slurry Pumps
Frequently Asked Questions for Your Slurry Pumps
Dec 18,
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What can you recommend to increase safe operation of my slurry pump?
Apart from the usual guarding of rotating components, it is important to get advice from the manufacturer or their dealer. This is especially true if buying a Slurry Pump secondhand &#; just because the manual says it was designed to pump 2,000 gpm, it may not pump anywhere close to that if the duty isn&#;t the same as the original. Each duty is very specific. Let&#;s say you installed the Slurry Pump and had the wrong size pipe, you could have a critical issue with material settling out, which may even cause the Pump to explode.
This phenomenon has been reported by the Mine Safety and Health Administration ( bulletin) as a major concern. If a condition occurs that blocks the inlet pipe and outlet pipe of the Slurry Pump, it is estimated that 40% of the energy from the motor will go to heating the contents of the wet end of the Slurry Pump. The heat rise can be rapid and steam pressure will build, and an explosion can occur. Confirming the correct flow rate to keep materials in suspension and maintaining the design percent solids and particle size can reduce this risk. Installing power and pressure monitoring sensors that are interlocked and/or alarmed are also advised. Tobee&#;s recently developed thermocouple device is another safety feature when fitted and alarmed.
Good process design, proper mechanical design of sumps and piping, and use of safety related add-ons are factors determining the safe operation of a Slurry Pump. The manufacturer is always the best place to start.
When I reduced the length of pipe line, why did the slurry pump trip out on overload?
Because the Slurry Pump is running at fixed speed and hasn&#;t been told that you removed a section of pipe, it will keep spinning away but now finds it is easier to slurry pump. If you look at your slurry pump curve, you will see that if you lower the head (resistance) that the Slurry Pump is pumping against, the new duty point will move to the right and the speed curve and head will intersect at a higher flowrate. The higher flowrate means more work is being done and thus power demand is greater. It would be the same if you reduced the height you are pumping to. The opposite occurs if you increase the head by adding pipe or vertical height to the discharge point. The danger with increasing the head without changing the speed is the lower flowrate that results, which may be below the critical setting velocity. Contact the slurry pump manufacturer if you are contemplating changes to any part of your slurry pumping system.
Can I use oil in my slurry pump bearings?
Tobee&#;s slurry pump bearing assemblies are designed around the use of grease lubrication - this means that the seals being used are not suitable for oil. It is more complicated to design for oil and any leakage is far more troublesome for both lack of lubrication and the spillage. Grease lubrication simplifies maintenance and is appropriate for the rpms typically seen in this type of equipment
I have an old slurry pump sump that my grandfather used in our old plant, can I use that for my new plant?
Rather than just say no, which would be the first reaction from any Slurry Pump manufacturer, let&#;s examine why you probably don&#;t want to consider this. From our perspective, 90% of problems are on the suction side of a Slurry Pump. Of those problems, 90% of those are associated with poor sump design, such as wrong wall angles (buildup in valley angles and corners), too shallow (vortexing), too big (settling and sloughing), too small (air entrainment, vortexing) and incorrect suction line (entrainment and NPSH issues). The science of sump design doesn&#;t start or finish with a cube or an old truck-mounted water tank &#; a correctly designed sump can save you many thousands of dollars in maintenance on your Slurry Pump, or even save a life.
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My slurry pump bearings are running hot, what should I do?
How hot are they? Tobee&#;s slurry pump bearings are designed to run at a relatively high temperature &#; we set a maximum of 120 &#; (248 &#;). Possible reasons for bearings running hot logically include slurry pump bearing failure; however, typically there will be other symptoms, such as unusual noise. Bearing failure can occur soon after gland failure if slurry has entered the seal at the wet end of the Slurry Pump.
It may simply be a faulty bearing. Were original equipment manufacturer bearings used during the last repair? It wouldn&#;t be the first time that price over value resulted in low-quality bearings being substituted.
Failure, or symptoms of failure, can also occur due to high belt tension (drive end) or air entrainment or cavitation (wet end), which will ultimately damage the bearings. Confirm the temperature rise (rises over time or almost immediate) and ultimate temperature. Look for other symptoms, such as noise. Ensuring personal safety, use a listening stick against the housing for signs that the bearings are not running smoothly. Consult the factory with the range of symptoms.
Fortunately, Tobee&#;s slurry pump bearing assemblies are simple to repair &#; purchase a bearing repair kit and follow the instructions. Be prepared with an oven for heating, but the assembly requires no preload settings &#; just locate the bearings in place, lubricate and put the end caps on, finish lubrication and you are done.
Technical dept.
Hebei Tobee Pump Co.,Limited
A Guide to Selecting the Best Slurry Pump Manufacturers
Slurry pumps play a crucial role in various industries, from mining and construction to wastewater treatment and chemical processing. These specialized pumps are designed to handle abrasive and corrosive fluids efficiently. However, the effectiveness of a slurry pump largely depends on the manufacturer. Selecting the right slurry pump manufacturer is essential to ensure optimal performance, reliability, and longevity of the equipment.
In this guide, we cover key factors to consider when sourcing and selecting slurry pumps, helping you choose a manufacturer that can supply high-quality, long-lasting pumps optimized for your specific needs.
Importance of Choosing Quality Slurry Pump Manufacturers
The selection of a reliable and reputable slurry pump manufacturer is critical for several reasons. Firstly, quality manufacturers use premium materials and advanced manufacturing techniques to produce durable and efficient pumps. This ensures minimal downtime and maintenance costs for the end-user. Secondly, reputable manufacturers adhere to strict quality control standards, ensuring that their products meet or exceed industry regulations and standards. Lastly, choosing a quality manufacturer provides peace of mind knowing that the slurry pump will perform reliably in demanding operating conditions.
Understand Your Slurry Characteristics
The first step is gaining a comprehensive understanding of your slurry. Critical details include:
- Particle size distribution - The size and distribution of solids significantly impacts pump wear. Larger particles and wider distributions require heavier constructed pumps.
- Density and viscosity - More dense and viscous slurries increase fluid forces and abrasion on pumps. Obtain density and viscosity profiles across expected operating ranges.
- Corrosiveness - The pH and chemical makeup determine the level of corrosion pumps will be exposed to. More corrosive slurries require upgraded metallurgy.
- Volume - Higher flow applications may dictate larger pump sizes or parallel pumping configurations for capacity.
- Operating cycles - Frequent on/off operation or rapid changes in flow put additional strain on pumps.
With detailed slurry data, you can select compatible pump configurations from manufacturers. Share slurry samples with them as well for testing and recommendations.
Evaluate Manufacturing Quality
Pump quality stems from stringent manufacturing processes. Look for these indicators of excellence:
- In-house foundry - Reputable manufacturers operate their own foundries with proprietary metalcasting processes refined over decades of pump production. In-house foundries ensure consistent metallurgy and high reliability.
- Advanced machining - Precision CNC machining produces dimensional accuracy for smooth surfaces, proper clearances, and interchangeability of parts. Avoid crude hand-worked finishes.
- Quality control - Robust quality control with critical checkpoint inspections maintains standards throughout fabrication. Audited ISO certified facilities provide added assurance.
- Vertical integration - The best firms control the end-to-end manufacturing process, from foundry through machining, assembly, testing, and service. This delivers optimized pumps.
- Employee expertise - An experienced workforce skilled at producing slurry pumps breeds manufacturing excellence. Look for decades or generations of pump building expertise.
- OEM support - Partnering directly with the original equipment manufacturer eliminates intermediaries and provides single-source responsibility.
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Assess Engineering Design
In addition to manufacturing quality, superior slurry pump engineering is vital for reliable performance. Evaluate these design factors:
- Hydrodynamic efficiency - Curvature of casings and impellers influence flow patterns. Advanced designs enhance efficiency, reduce turbulence, and minimize wear.
- Materials of construction - Optimal material selections prolong pump life in abrasive and corrosive applications through hardened metals, elastomers, and protective coatings.
- Sealing systems - Seals configured for slurry conditions prevent leakage and contamination. Look for tandem pressurized seals on centrifugal models.
- Bearing arrangements - Robust bearings in oil bath housings withstand side loads and prevent shaft deflection. Larger pumps may incorporate anti-friction bearings.
- Adjustability - Impeller and throatbush clearances should be adjustable via external means to optimize efficiency during wear.
- Serviceability - Quick access to wear parts through large inspection covers simplifies maintenance. Standardized components also facilitate servicing.
Ask manufacturers to explain the engineering rationale behind their designs. Look for pumps engineered specifically around slurry handling rather than multi-purpose configurations.
Verify Operational Experience
Ultimately, you want slurry pumps and a supplier proven in actual field conditions over thousands of hours. Seek out these assurances:
Application history - Experienced manufacturers will provide references with decades of successful use in applications matching yours. Visit installed sites when possible.
End user connections - Strong relationships with customers provide feedback for continuous pump improvements. Look for close engineering collaboration.
Industry leadership - Suppliers at the forefront of positive displacement and centrifugal pump technology offer the latest advancements.
Operational support - OEM staff should have in-depth knowledge of their pumps in operation, available for troubleshooting and optimization.
Local representation - Convenient sales and service locations provide responsive support, short supply chains, and reduced costs.
By selecting slurry pump manufacturers with demonstrated quality, robust designs, and application expertise, you can feel confident in obtaining the most suitable pumps for your field conditions and process requirements. We hope these guidelines provide a valuable framework for evaluating and choosing reliable slurry pump suppliers as your partner. Please reach out with any additional questions as you source top-performing equipment for your operation.
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