Seeking advice on the reasons for abnormalities in the pump
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I have a question for the experts here. We have 3 slurry circulation pumps connected in parallel from south to north; the tower is located in the south, and the slurry at the bottom of the tower is drawn out through a pipeline. The inlets of the three pumps are connected to this pipeline in sequence. Two issues arise during operation: first, the pumps on the south side and the one in the middle tend to fail more easily, sometimes experiencing shaft cracks, while the pump on the north side operates more stably. The second issue is that when the pump in the middle and the pump on the north side are in use, the temperature of the motor stator of the pump on the north side rises; however, once the pump in the middle is replaced by the pump on the south side, the temperature of the motor stator of the pump on the north side returns to normal. I would like to ask about the reasons behind these two situations; I hope some experts can help analyze them.
Are there any photos of the pipeline layout on site?
Water grabbing by the pumps occurred; during operation, the outlet valves of each pump were properly controlled to ensure that the flow rate for each pump was the same.
That’s more or less it; the slurry enters from beneath the tower on the south side. The inlet diameters of the three pumps are the same; I’ve drawn a simple diagram of it
In the second case, a high stator temperature of the pumps in the north can be attributed to an excessive flow rate, resulting in some overload and thus water competition; then, in the first case, where the failure rate of the pumps in the south and the center is higher than that of those in the north, is this also caused by water competition? Could you please explain this? I’m not quite sure about it. Thank you
What type of pump is it, single-suction or double-suction?
What is the outlet pressure of the three pumps when they are in operation?
How should situations like this be improved?
Generally, two pumps are in operation with one as a backup; the pressure in the outlet main pipe, as shown on the computer, is higher when the pumps on the south and north sides are in use, compared to when the pumps on the middle and north sides are in operation