Slurry pumps are used for the transportation of solids in coal, copper, iron ore, phosphate and in other mining operations. They are also used on dredges cleaning waterways, in environmental cleanup and in reclaiming land throughout the world.
Slurries by their very nature are very abrasive requiring the impeller, casing and suction liner wet end component parts be replaced at regular intervals. It is not uncommon, for example, for six liners, three impellers and two casings to be consumed in one year. It is estimated that about $500 million in slurry pump wear parts are consumed every year.
Numerical models now exist to predict component wear for a given set of operating conditions with a given design. The use of these models is however available to a select few and no general relations exist for the user.
The writers in this paper model a selection of pump designs producing general relationships for the different pump casing, impeller and liner components for different duties. They then take these and show which offer the lowest cost of ownership for different services.
Keywords: Slurry Transport, Slurry pump, Wetted Parts, wear Rate, CFD Simulation, Lowest Cost of Ownership.
In this study, existing numerical flow simulation methods have been applied to a broad range of slurry pump designs and sizes at various operating conditions including ranges of flow, head, solids size and solids concentration. The resulting data were then analyzed for significant trends and are reported here in some detail.
These results show that many of the variables considered can have dramatic effects on the pump wear rates and therefore also on the costs of system operation, both from the viewpoint of component replacement, as well as downtime associated with pump repairs. Seemingly simple changes such as adding or removing one pump from a long pipeline, or pumping at a slightly different concentration, can easily double or halve the life of the wear parts.
The goals of this study have been several:
1. To quantify the effects of important slurry pump operating parameters and design geometries on component wear.
2. To investigate the overall cost of operating a slurry pump relative to the operating conditions and design types.
3. To provide a guide for determining what design type of slurry pump is best suited for each application.
4. To provide the pump user with generic tools for determining slurry pump wear rates and costs during the planning stages of slurry system design.
It is hoped that the data presented here will provide designers and users alike a better understanding of slurry pump wear behavior and how this critical component in many mining and dredging operations can be more effectively utilized.
For more details, Pls download: SLURRY PUMP COMPONENT WEAR AND COST.pdf
Hebei Tobee Pump Co.,Limited