Bedford Pumps Ltd, manufacturers of high capacity pumps for the water, waste water and flood control markets, can supply a low maintenance alternative to conventional submersible volute pumps for partially treated sewage applications on waste water treatment plants.
Conventional suspended bowl pumps are not generally considered a solution for waste water applications. They are designed for clean water service and typically have a higher number of impeller vanes and narrower hydraulic passages. Bedford Pumps have resolved this issue by engineering pumps with solid passing capabilities between 90-200mm, dependant on pump size. In addition, they have re-engineered the bowl design to incorporate special swept diffuser vanes which allow the passage of large solids and even fibrous materials. The pumps are designed without conventional intermediate column shaft bearings and bearing support spiders, thus removing the opportunity for ragging to occur within the column pipe. Bedford Pumps therefore provide a value-added alternative to small wet well submersible pumps which are often associated with having a short “mean time between failure”.
Bedford Pumps are world leaders in the design and manufacture of such specialist robust and reliable pumping plant. Their engineering team has decades of experience in both hydraulic and mechanical design using the latest state of the art software to optimise and analyse their product. Pictured here is the detailed report of the frequency shaft critical speed analysis carried out during the design of such a pump for a waste water works application.
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