The relationship between pump outlet pressure and whether the pump is overloaded
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How can pump flow rate be determined based on changes in the pressure indicated by the pressure gauge at the pump outlet? Or is the pump overloaded?
The head is calculated based on the pressure difference between the inlet and outlet and the specific gravity; the flow rate can be determined from the performance curve, and the shaft power can also be found. However, to determine whether the motor is overloaded, it is recommended to use an ammeter for assessment
It’s just a macroscopic assessment: when the pressure is higher than normal, the flow rate decreases； When the pressure is below normal, the current increases. The premise is changes under normal circumstances. If the inlet valve or outlet valve is adjusted, this is excluded under normal conditions.
The motor burns out due to overload. If pressure gauges can determine motor overload, then what is the need for a control panel?
As can be seen from the pressure gauge, short-term motor overload is acceptable
A centrifugal pump can be understood in this way: when transporting liquids with low viscosity (usually below 100 cp), the head is calculated by subtracting the inlet pressure from the outlet pressure and then dividing by the specific gravity. The pump’s flow rate can be determined by referring to the pump performance curve. Of course, whether the pump is overloaded can be determined by looking at the pump’s performance curve at the same time.
When the pressure is higher than normal, the flow rate decreases； When the pressure is below normal, the current increases. The premise is changes under normal circumstances. If the inlet valve or outlet valve is adjusted, this is excluded under normal conditions.
Performance curves are a useful tool; by observing changes in outlet pressure, it is possible to determine the corresponding changes in performance parameters, as theoretically those parameters are in one-to-one correspondence. :)
The lower the outlet pressure, the greater the flow rate and power consumption, and the higher the risk of damaging the motor