Overcurrent problem in centrifugal pumps
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Cantilever centrifugal pump, operating with hot water at a temperature of around 100 degrees. After running for some time, it always experiences overcurrent, causing the motor to shut down for protection. The filter is not clogged, and there is no wear on the internal machinery. Everything works normally once the pump is refilled with fluid. I’m seeking advice on the possible reasons for this overcurrent that leads to shutdown – could it be related to the process operations? I need some advice. .
Is there a vapor locking phenomenon? Since high-temperature water is being transported, the inlet pressure can be increased slightly.
The water pump should be under overloaded conditions. Check whether the pressure difference between inlet and outlet is significant, as well as whether there is a large deviation from the pump’s head; also operate with the valve closed to see if the issue persists
The parameters of the pump are not mentioned, nor is the flow rate at the site or the pressure difference between the inlet and outlet; nothing is said about the operation of the pump’s rotating mechanism either. Only the observed phenomenon is discussed
Hot water at 100°C – cavitation must be occurring; try lowering the temperature and increasing the pressure.
There might be an issue with the electrical protection; contact the electrical team to have it checked
Is there still overcurrent after refilling the pump?
You can try adjusting the opening degree of the outlet valve to see how the current changes; if there is a noticeable change, then you can check the opening degree of the pump’s return valve as well as the process parameters
There are 3 to 4 reasons for overcurrent: head and pressure drop, flow rate, and whether there is friction Is the ammeter accurate? Is the voltage low?