Vertical immersion pumps are essentially vertically immersed centrifugal pumps where the motor is separated from the pump by a long shaft. For this reason, they are commonly referred to as vertical shaft pumps or vertical column pumps. Whereas with a submersible pump the whole assembly is immersed into the fluid, with a vertical cantilever pump the electric motor is located above the fluid and is connected via the vertical shaft to the pump impellers which are immersed into the fluid. Vertically immersed shaft pumps are the ideal solution when needing to pump from a sump, underground well, a reservoir or tank, which is why they are also known as sump pumps. Their ability to handle high temperature and flammable liquids make column pumps a popular solution when a traditional submersible pump cannot be used.
Applications in which vertical line shaft pumps are used include:
Potable water supply
Plant make-up water
Vertically immersed pumps can cover a wide range of flow rates and heads making it a versatile type of transfer pump, and used when the flow rate exceeds the capabilities of a jet pump. Another benefit of the centrifugal vertical column pump is that its construction is space saving.