How To Choose Vertical Turbine Pump ?



Vertical turbine pumps are designed for pumping applications with clean or slightly contaminated liquids. The hydraulic section is submerged in the liquid to be pumped, with the engine mounted dry on the top of the well or pitcher. The discharge occurs through the common upright where the pump shaft is located. Vertical turbine pumps have a vertical shaft with sliding bearings lubricated by the pumped liquid. Within this type, the pumps provided with an elongated shaft and driven by a submersible motor arranged immediately below the pump or diver pumps can be distinguished.
The simple target impeller can be radial or diagonal, depending on the working conditions and closed or semi-open. A more careful vertical adjustment is required during assembly. The set of diffusers of the pump and the discharge pipe hang from the head on which the motor is mounted. Diffusers sometimes have a special enamel coating to minimize hydraulic losses and thus improve performance. The Vertical Turbine Pumps Manufacturers allow the mounting of the desired number of stages, combining the necessary diffusers and impellers. This offers some flexibility to applications.

Vertical turbine pumps with the engine above

In these pumps, the shaft goes inside the discharge pipe, without protection if the lubrication is by oil, or inside a protective tube if the lubrication is by water. With these pumps, about 200 mca can be reached. Poor shaft alignment affects the life of the bearings and generates vibrations during operation.

Vertical turbine pumps with submerged engine

Motors have been developed that can work within the liquid and of dimensions that allow them to be mounted inside the well to avoid the disadvantages of long shafts. In this way the shaft disappears, the bearings and the protective tube and the discharge pipe can be smaller in diameter. The motors can be dry running with an airtight seal or flooded with special insulation.


The advantages of the submerged motor can be seen very well in wells of more than 30 m deep, or inclined or curved. The required surface space is minimal and even zero with underground discharge.

Vertical turbine pumps suppliers mostly used these pumps because these pumps handle large flows with small heights in a vertical and submerged position. They also have director vanes in order to avoid or reduce excessive pre-rotation of the liquid vein in the aspiration. This happens in places where there are swirls on the surface of the liquid. The shaft can be oil lubricated, in which case it is arranged inside the corresponding protective tube with the bearing bearings. The impeller can be cantilevered or have a lower bearing. In certain pumps of this type, it is possible to disassemble the shaft and the impeller from above, without the need to remove the discharge pipe.

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