What is the most common impeller design used in wastewater centrifugal pumps?

The most common impeller design used in wastewater centrifugal pumps is the closed impeller. This design features two side walls, or shrouds, which enclose the vanes. The closed impeller is particularly effective in handling liquids with small solids or particulates, as its design minimizes the potential for clogging and improves efficiency. The closed structure allows for better hydraulic performance by creating a more stable flow of fluid, reducing turbulence and ensuring that the pump can maintain a consistent flow rate and pressure.

In wastewater applications, where the fluid can contain varying amounts of debris and solids, the closed impeller design is favored because it provides superior performance in a wider range of operating conditions and enhances the longevity of the pump. Unlike open impellers, which are more susceptible to solids causing blockages, closed impellers are robust and can effectively manage the challenges posed by wastewater environments.