The types of centrifugal pumps used for pumping sewage do not use diffuser vanes. The reason for this is that the rapid change in the direction of the impeller discharge can cause suspended matter in the liquid to come out of suspension and form deposits that corrode and foul moving parts. Other types of centrifugal pumps, known as turbine well pumps, are used to pump wells.

To produce sufficient discharge pressure, you must equip these pumps with a multistage impeller arrangement that is contained in volutes, referred to as bowls. To ensure satisfactory suction, set the impellers and bowls below the lowest drawdown or pumping level that the water in the well is expected to reach. USE OF CENTRIFUGAL PUMPS.

2012-05-02

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