How to choose the best slurry pump?
Pumping slurry is not as easy as pumping water. There are many variables that go into choosing the proper Slurry Pump depending on the type of slurry. There is no formula or dry answer as to what is the best Slurry Pump design. You must combine knowledge and application specifics to select the ideal slurry pump.
Rubber Lined Slurry Pump
The construction aggregate industry transports slurry in various forms, from fine sand to coarse aggregates. Fine sand is extremely abrasive and tends to wear down slurry pumps quickly. The characteristics of coarse aggregates that can affect pump performance are size, shape and surface texture, as well as particle size grading, and fines can create excessive friction in the piping.
Rubber Lined Slurry Pumps have been used to protect plants and equipment from wear for nearly a century and have maintained their position as the wear-resistant material of choice for pumping and separating fine-grained slurries. When dealing with wet sand slurries, natural rubber is an excellent wear-resistant material. Its strength, elasticity and resistance to cutting and tearing have a positive impact on the wear performance of slurry pumps. When the particles hit the surface, the rubber deforms and absorbs the kinetic energy of the particles. The elastic nature of the rubber returns most of this energy to the particles, allowing them to bounce back with little or no wear.
When pumping slurry in wet sand applications, we must evaluate the abrasive particles flowing through the pipeline and their subsequent effect on the slurry pump. If the pump is lined with poor quality rubber, the particles do not bounce back effectively and as a result the rubber begins to break in large chunks. The gouging then begins to accelerate, negatively impacting the pump's efficiency and often leading to turbulence.
Another important part of a slurry pump is its housing, which is responsible for handling all the pressure. The slurry pump casing should have a large clearance between the impeller and the cutwater tongue to reduce wear and prevent large solid particles from getting stuck. With the extra space, there is more recirculation within the slurry pump housing under a variety of operating conditions. Again, this accelerates wear compared to typical pumps. Slurry pumps also have a provision for simple axial adjustment of the clearance between the impeller and the adjacent throat sleeve sealing surface. This helps to maintain pump performance as internal components begin to wear.
Rubber Lined Slurry Pump
Metal and/or rubber pump liners are used to combat the erosion of solid particles in the slurry. Metal slurry pump housings are usually made of carbide to resist erosion caused by increased pressure and circulation. Sometimes, wear-resistant steel is used on the pump casing so that the pump can be welded if repairs are needed.
Keep in mind that slurry pumps are designed to adapt to specific pumping conditions. Pumps used in the cement industry primarily handle fine particles at low pressures, so the pump casing can be of lightweight construction. In rock pumping, the pump casing and impeller must resist the impact of hard materials, so they must be built thick and strong.
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