About self-priming pump seal
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As shown in the picture of the self-priming pump, the medium is a mixture of tar, ammonia and water, the temperature is about 30 degrees, and the mechanical seal spring sheath is corrosion-resistant. Now the following situation occurs and we need technical discussion: 1. The mechanical seal will be damaged and leak in about 3 days. When the mechanical seal sheath is opened, the rubber of the sheath will crack, or the moving ring surface will be worn. The maintenance staff were annoyed, and this didn't happen when the weather was warm. Please tell me what methods can be solved.
Change the O-ring type seal to a large spring structure
This post was last posted by Bubble_ZPTK on 2018-12-25 12:04 The editor really wants to change it to O-ring seal. Thank you.
Such problems are often caused by impurities in the medium itself. When the first damage occurs, there will be traces of wear on the shaft seal, causing leakage, bringing in impurities and continuing to wear. The key issue is to ensure the impurity content in the medium. In addition, when repairing and installing the dynamic seal, the original damaged surface must have a certain smoothness, otherwise the leakage will continue to damage it.
We have confirmed that the problem you mentioned does not exist. . Impurities cannot be changed. Should we consider replacing the pump? Is the selection wrong?
Is it related to the increase in viscosity at lower temperatures?
If it is a tire belt problem, you should consider replacing the pump. Consult the original design unit for technical support. If it is a problem of the day after tomorrow, it is a problem of maintenance quality. If the pump must be replaced as a matter of course, it is best to replace the equipment you are currently using. Recommended based on appearance.
Seen from above, it is a self-priming pump. The reason for considering the pump is also one direction.
The poster mentioned that there is no problem when the weather is warm, but the problem has only appeared recently. The medium is normal temperature (30°), so we must consider the situation when the weather gets colder and the temperature difference between the machine seal is too large.； In addition, the moving ring of the machine seal is seriously worn, so it is still necessary to check whether the medium has any impurities. Personally, I think that after the moving ring is worn, the friction resistance increases, and the mechanical seal rubber sheath is subject to greater torque, causing damage.