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I have a motor-driven pump; when the flow rate of the medium is high, the pump motor becomes overloaded and trips. What methods can be used to reduce the flow rate? Should the pump inlet be closed? Or should the pump outlet be closed? Or should the valve at the pump outlet be adjusted? Which method should be used to reduce the flow rate so that the pump motor does not trip? Please share your opinions; extra points for good answers
It is usually controlled by an outlet valve; if there is a total of 100 tons, the outlet valve regulates around 80 tons, and the control valve can be used to adjust the flow rate as desired
When the resistance increases, the current decreases.
Check the Q-h curve of the pump, and use the formula to see if the power can be reduced; if it can be reduced, then the current will also decrease.
Try turning down the outlet valve
First, it is necessary to determine whether reducing the flow rate will meet the process requirements; if not, then a different motor should be used
Closing the outlet valve reduces the pump’s output capacity
It’s still the motor that has a problem, or there’s an issue with the power distribution! In many cases, when the valve is closed, the flow rate decreases, but the power does not decrease – it may even increase!
When the flow rate of the pump driven by the motor increases, the current rises; the current also increases when there is high operating resistance. The current is at its lowest when the motor is running without a load. If the motor of a reciprocating pump is variable-frequency and the pressure at the pump outlet is high, too low a frequency setting can result in excessive current.