I have a question regarding the current of a pump motor
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I went to a factory today; it involves a centrifugal pump of the IS200-150-315 model, with a flow rate of 374 cubic meters per hour, a head of 28 meters, and a motor power of 45 KW. The pump sends fluid through 3 bends to a location on the 6th floor at a height of about 18.5 meters. It was found that the motor current was only 62 A – is there something wrong? It seems that the power has decreased, while the pressure head remains unchanged; it’s likely that the flow rate has reduced. I’m not sure if that’s correct Is the pump’s efficiency too low? Is it because the motor used is too large? 35 kW would be sufficient, wouldn’t it? I suspect that insufficient traffic is causing the drop in traffic, a decrease in power, and a reduction in current. There is no flow meter installed on the pipeline, I guess. . . . . . . . . .
Isn’t there a pressure gauge at the pump’s outlet?
I thought a 37kw motor might result in too high flow rates and overcurrent, so I opted for a 45kw motor instead
It is pressed too high, causing the pump to operate at a low flow rate, so the current is low
Back pressure? You mean the export resistance is too high, right? With a head of 28 meters, it should be sufficient.
What liquid is being transported? The actual current is related to the density of the liquid; is there frequency conversion control? 45kw is the rated power; if variable frequency control is used, the actual power will be different.
It’s hard to determine the outlet pressure and flow rate; what is the rated power? When considering the performance of a pump, first look at flow rate and pressure, and then at power efficiency.
There are many reasons; it could be that there is a problem with the pipes or valves, resulting in low flow, or it might be that the impeller was installed incorrectly or the motor is running in the wrong direction. It’s possible to determine whether this has been the case all along or if it started happening recently.