What should be done if the following abnormalities occur while a centrifugal pump is in operation?
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The centrifugal pump was operating normally until today, when it suddenly experienced overcurrent; the backup pump also had overcurrent issues. Now both pumps are running in parallel, and the currents of the two motors are normal. What could be the cause? The processing volume remains unchanged
If both units are operating normally, it’s impossible that there’s a change in the properties of the medium or mechanical failures; could it be a sudden change in the feed pressure?
It basically has nothing to do with the equipment; it’s about checking whether there are any fluctuations in the process, as well as the pipeline valves and outlet points ? ? Let me know if you find the problem; I want to know why too.»
The reason may be a change in the composition of the medium, such as a sharp increase in viscosity or density
Can I view the motor current trend of the pump? If there is a sudden overcurrent during operation, compare the trends in outlet pressure and flow rate under normal conditions with those under overcurrent conditions. It can generally be viewed on the DCS in the internal control room. There should be no problem with the pump itself; it’s related to the process.
Reply to 4# WQC: If the composition of the medium changes, then when the two pumps operate in parallel later on, they are also pumping a medium with a changed composition – why doesn’t this lead to an overcurrent? So I feel it shouldn’t be a change in the medium components
Reply to 6# hgkklzp: With changes in the composition of the medium, if the flow rate required by one pump is handled by two pumps, overload may be avoided； It depends on the increase in density or viscosity. It shouldn’t be a mechanical failure :)
In my opinion, you should look for the cause in the electrical systems and instruments. Have a technician check it.
I agree with the person above; changes in the medium don’t have such a significant impact on the current consumption of the pump. Check whether there is a problem with the flow rate – it might be too low.
Reply to 9# wsm1988: If the flow rate decreases, one pump will be sufficient, and there will be no more overcurrent
In my opinion, if the medium is normal with no pressure fluctuations, it’s worth checking whether there are impurities in the isolation fluid and lubricant that could cause an overload, as this situation can also lead to sudden increases in current. Maybe it’s what the previous colleague mentioned – sudden fluctuations in the production medium; perhaps you just didn’t notice them. Take a look at the production curve. If there’s a correct answer, let me know too, hehe···