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wear resistant slurry pumps for magnesite high speed

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wear resistant slurry pumps for magnesite high speed

seHandbook: How to Fight Flow Challenges now! As a result of such requirements, a slurry pump often is l... fluid velocity and particle velocity; and hydrodynamic properties of the flow . Turbulent flow analysis usually isnt applicable for slurry pumps because the presence of solid materials will directly influence the turbulence parameters. The mechanisms of turbulence become a complex problem particularly for dense slurries. This, combined with the nature of the flow inside a slurry pump, which is characterized by unsteadiness as well as deformed velocity distribution patterns, cause a very chaotic situation. However, some simple rules have been verified both in theory and experiments. For instance, the erosive wear rate is proportional to the flow velocity. It also depends on the solids concentration; as that concentration increases, so, too, does the wear rate. In addition, the sizing and specific gravity of solid...

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These tend to be larger than their clear liquid counterparts. Achieving a given head and providing more material for wear purposes requires a lower impeller speed. Minimizing speed and maximizing wear life of both the impeller and suction side depends upon a proper configuration. High wear applications usually call for closed type impellers. In applications with coarse particles, expelling vanes on the face of the front shroud make sense. These vanes prevent large particles from becoming trapped between the impeller and suction side liner and minimize recirculation. The benefit is reduced gouging and recirculation wear at the expense of a 23% drop in efficiency. In addition, expelling vanes often are used on the back shroud of the impeller in coarse particle applications to prevent the trapping of large particles between the impeller and back liner. In this location, they also serve to decrease the forward axial load by lowering the pressure acting on the back shroud and beneficial...

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Slurry pumps usually require sumps or suction tanks to act as suction source or intermediate storage for slurries. However, lack of detailed knowledge about the slurry pumps behavior and sump hydraulics often leads to oversizing. The larger the sump or storage tank, the more likely it may become a settling tank for solids. For some services, the accumulation of solids leads to other problems, for instance, the build up of harmful gases, and requires periodic desludging of the sump or tank, which increases operating costs and reduces overall safety and reliability. The optimal volume of suction storage, in this context, should prevent the settling of solids while avoiding problems for pump operation. AMIN ALMASI is a mechanical consultant based in Sydney, Australia. Email him at [email protected] .

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Series pumping slurry pump selection

Both types of pumps can usually process slurries containing fine particles, however particle sizes above 6 8 mm may not be suitable for PD pumps as large particles can cause valves to stick open, reducing operational life. In this instance, centrifugal pumps are better suited to handling mixtures of fine and coarse particles, known as co disposal. Slurries which have a high percentage of 75μm or finer particles can result in the slurry exhibiting a yield stress. The higher the yield stress, the harder the slurry is to pump. A yield stress slurry typically causes issues at the intake of a centrifugal pump. Various methods can be used to enhance the pumps suction conditions, including flow inducer impellers to increase the shearing and lower the NPSH required at the pump intake. Slurry properties should be established using a series of tests to determine the range of particle distributions, pumping density, density possible from thickening, yield stress, plastic viscosity, slump plat...

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Pipelines are normally designed to operate at velocities in the transition region between laminar and turbulent or in the fully turbulent regions. Slurry velocity along the pipeline must be assessed to ensure settling and subsequent blockages do not occur. PD pumps deliver a fixed volume of material which is proportional to the pump speed and are less sensitive to system design than centrifugal pumps. Furthermore, PD pumps are ideal for transporting liquid through long sections of pipeline. A further benefit of this fixed flow characteristic is that it can assist with the self cleaning of the pipeline. Centrifugal pumps are to shorter distances. When using centrifugal pumps to transport slurry over extended distances, multiple pumps must be used over a series of stages. Multi stage centrifugal pump installations require careful analysis of the pipeline system curve and its intersection with each stage pump curve to properly define the possible pump operating ranges. Start up...

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The main mechanical differences between centrifugal and PD pumps relate to the maximum pressure and maximum flow a pump type can handle. Centrifugal pumps are best suited for a maximum of 7 MPa pressure and 7,000 m3/h flows and can be arranged in a series up to a maximum of 8 pumps. PD pumps can handle much higher pressures but reduced flow compared to centrifugal pumps typically a maximum of 30 MPa and 1000 m3/h, with the optimum configuration of PD pumps less critical than with centrifugal pumps. While multiple centrifugal pumps in series are required to generate sufficient system pressure, PD pumps must be installed in parallel to generate the required total flowrate. The output of both types of pumps can be controlled with the use of variable speed drives. Variable speed can change the output depending on the slurry properties, or to compensate for wear in centrifugal pumps. It is recommended to use water or heavily diluted slurry in a pipeline when ramping...

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Selecting the optimum pumping equipment for specific applications can be relatively straightforward if the application falls clearly within either of the centrifugal or PD ranges. However, for applications where both types of pumps could be suitable, then further evaluation of capital and operating costs should be carried out. The cost comparison should include the cost of ancillaries, particularly the sealing water equipment required for centrifugal pumps. Wear of centrifugal pumps is typically light for the aforementioned types of slurries and all pumps in a series normally wear at the same rate. Pump liner and impeller wear life varies greatly but is typically from 4 to 18 months depending on the application. PD pump wear is normally confined to the valves; with a typical life of approximately 3 to 6 months depending on the slurry and application. If the slurry is acidic, then corrosion resistant materials should be used. While centrifugal pumps may generally cost less than a PD...

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