Problems with filling a centrifugal pump?
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The 22kw centrifugal pump has a flow rate of 120 cubic meters per hour and a head of 45 meters. There are 100 pipes for both import and export; water cannot reach the 12-meter platform, and the pressure gauge shows just over 1 kilogram of pressure. The current is 28A, while the rated current is 41A. The motor is rotating in the forward direction – what could be the reason?
Is this pump being used for the first time or has it been used before? The pressure you’re getting is not sufficient; theoretically, with a head of 45 meters, the pressure should be around 4.5 MPa. Check to see if there’s anything blocking the inlet filter Or the pump inlet seal is not good and air is leaking
Is there air left in the pump that hasn’t been expelled?
This is a new pump that has just been put into use; it is from Dongfang Pump Industry. I also suspect it’s an import issue, but after opening the filter myself, there was nothing inside, and there were no leaks in the pump’s inlet pipeline
The pump’s exhaust valve remains open until water is discharged, and when the pump is running, the pressure can reach around 6 kilograms
Check whether the pump’s rotation direction matches that of the motor. If it’s consistent, as you said: when the pump is started, the pressure can reach around 6 kilograms. This indicates that the pump should be fine. So I think you should check against the pump’s performance curve to see whether the parameters at the design point match those during actual operation.
I see you said it was 0.6 at first and then it dropped after the valve was opened; this is because there’s too much air in your pump. Release some of that air. We’ve encountered this problem here before as well, and it was resolved by releasing the air. The pressure will be slightly higher after doing that, so you might want to try releasing the air and see if the pressure goes up
When the motor rotates in the forward direction and the current is low, it indicates that the load is low; in other words, the water volume is low, resulting in low pressure. A possible reason is poor import conditions ； The pump body is not sealed ； The impeller is loose ； Impeller installed in reverse ；
What is the temperature of the water you’re referring to? Could it be cavitation? I think if it’s restrained with energy, it should be possible to deal with it quickly
Could it be that the medium being inhaled contains air? If the problem is solved, feel free to post and let us learn from it*.
I’ve learned it.* . . . . . . . .