Issues related to the use of magnetic pump
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This post was last edited by Black gold on 2011-7-4 at 17:53. For the circulation pump that moves liquid from the lower to the higher level in the distillation tower, since leakage of the liquid is not allowed, we opted for magnetic pumps. However, these pumps often break down and get worn out during use. At first, we thought it was due to errors in the workers’ operations; but even after standardizing their procedures, similar problems continued to occur. After thorough investigation, we discovered that it was a problem related to the process itself. Since both the inlet and outlet of the circulation pump are under vacuum conditions, the pump chamber cannot be filled with liquid when it is started, which leads to wear and damage of the components. As a result, we instructed the workers to open the inlet and outlet valves before starting the pump, wait for 3 minutes, then close the outlet valve, start the magnetic pump, and finally open the outlet valve again. Do any of you have any good solutions?
Reply 1# yangliudru: Please specify the type of magnetic pump! 1. Self-priming pump? 2. Fluorine-lined magnetic pump? 3. What are the characteristics of the material medium name? 4. Does the material contain particles? 5. Was the problem solved after changing the startup scheme?
As long as the vacuum levels on the inlet and outlet are the same, this situation should not occur; consider whether it is caused by excessive axial force. Is the process flow rate identical to the designed flow rate of the pump?
Also, are there any mechanical impurities in the material?
I’ve been quite busy these days, so I’m getting back to everyone’s questions. The model of the magnetic pump is CQB, and the liquid involved is an organic solvent (containing water). After making some adjustments, the problem of no liquid inside the pump was resolved; however, it wasn’t easy to determine the exact cause. Later, we added a bypass to the pump’s outlet, connected it to a sight glass, and installed a valve – the valve is closed once the pump starts operating.
A simpler approach is to add a buffer tank at the bottom of the tower, which prevents idling as well as cavitation. Many scrubbers are done this way. But the tower’s efficiency is a bit lower. You need to weigh it out.
If the medium is dirty, consider installing an inlet filter or using a shielded pump
A magnetic pump needs to be primed, otherwise it will lose its magnetism.
Agree with what was said above; I support it. Those who are actually using it know best!
It is best not to run a magnetic pump without liquid; there should be no iron or magnetic materials in the vicinity. It is essential to ensure that the pump chamber is filled with water before starting it, as this helps protect the pump. Additionally, check the balance of the pump
We all did things according to our own methods. The day before yesterday we replaced it with a new pump; the inlet and outlet of the CQB pump are also evacuated, with the same vacuum level at both ends, and the pump was also filled with fluid. But today there’s no flow again. We haven’t disassembled it yet; it seems we need to check the manufacturing process. It’s frustrating. Also, I’d like to ask if anyone has any standards regarding the maintenance of magnetic pumps – for example, at what level of wear should the pump be replaced, and what precautions should be taken during assembly? We don’t have any professionals who specialize in pump repair here