Analysis of the problem of excessive lift of magnetic pump, please help the equipment experts to analyze it
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Hello, all professionals, I would like to ask a few questions. The picture shows a tank-filled self-circulating pump unit in our workshop. The AB pump filters and then goes to the tubular winding heat exchanger and then enters the tank. Now there is a problem. Our pump is a magnetic pump with a lift of 25M. After the actual on-site pump is turned on, the pressure of pump A will be more than 3 kilograms, and pump B will be more than 3.5 kilograms. My own analysis of this problem is that the outlet pressure is too high because the outlet passes through the heat exchanger and there is resistance in the heat exchanger. Now my question is, what is the reason for the outlet pressure being too high? What are the above reasons? Is there any damage to the magnetic pump caused by working under the condition that the magnetic pump outlet pressure is 3.5 kg for a long time? Please give the equipment experts some answers, thank you.
1. What is the pump inlet pressure? 2. If the back pressure is high, the flow rate will be small, which will damage the magnetic pump.
The inlet pressure is the self-weight pressure of the tank medium filled in the tank.
The flow rate is not monitored. The two pumps are used for reflux heating, so the flow rate is not monitored.
The operating point of the system shifts to the left, the head increases, and the flow rate decreases.
Single-unit testing generally does not start and prepare at the same time.
First check whether the pressure gauge is accurate. The water pump has a lift of 25, which is a bit high if you add the inlet pressure of more than 3 kilograms. The most critical thing about the safety of a magnetic pump with low efficiency is whether it can take away the heat generated when the pump is running at a small flow rate. As long as the flow rate is sufficient, it is normal for the outlet pressure of the two pumps to be different.
It is necessary to clarify the inlet pressure. The normal pressure will be different from the 1-3 kg inlet pressure. The outlet pressure is related to the flow back pressure.