Cavitation is the formation and abrupt collapse of vapour-filled bubbles. This process takes place at points inside the pump where the pressure falls below the vapour pressure of the pumped medium.
What is an NPSH curve and what is its significance?
Dry running, also referred to as inadequate lubrication, occurs when there is air in the rotor chamber, meaning that rotating parts are not cooled and lubricated as they should be.
Downforce is a downwardly directed force acting on the pump's impeller/shaft unit during operation.
A drainage pump is primarily intended for pumping surface water and seepage to different locations, and for the pumping of groundwater.
‘Lift’ refers to a condition whereby an upwardly directed force acts on the impeller/shaft unit of the pump during operation.
The maximum sand content of the water may not exceed 50 g/m³.
While operating the pump, an uninterrupted minimum flow rate is required in order to sufficiently cool the pump and the motor.
In order to ensure adequate cooling and lubrication of the pump, there must be sufficient volume flow through the pump.