Help needed, problems with multi-stage pumps
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Our factory has a DG multi-stage centrifugal pump that, after operating for some time, shows a low current level. When the pump is stopped for a few hours and then restarted, it operates normally. What’s the reason for this? Please provide a detailed explanation. Thank you for your help
Is there any fluctuation in the process system, and is it evacuated? Check whether the pump body shows symptoms such as vibration or noise. Check whether the flow channel is blocked.
There’s no issue with the process; out of the three medium-pressure pumps, two are in use while one is on standby. I always thought it was due to air entering the pumps. When I went there in the afternoon, the pumps were working normally. Around 5 p.m., someone called to say that the pumps were making noise, and both the flow rate and current levels dropped. After stopping them for an hour, they started working normally again
There is air in the pump; check whether the inlet pipe is leaking. Rotate the pump before starting it to release the air.
If the liquid level at the pump inlet is normal, there might be air at the pump’s inlet”； Given your situation, if this continues, it’s necessary to carefully check whether there are any issues with the inlet piping of the pump; I’m referring to the possibility that other pumps are affecting the operation of this pump ； But it always seems that the pump is large enough yet the flow rate is insufficient, which sometimes leads to vacuum conditions
Thank you all for your replies. I took the pump apart today; there was a problem with the inlet valve, which caused air to get inside the pump and prevented it from functioning properly