What to do when sliding bearing damage occurs frequently in magnetic pump systems
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The magnetic pumps in our factory often experience broken sliding bearings, and the cause is unknown! The manager wants a filter added at the inhalation end. Is that appropriate? What mesh size would be suitable? What is inhaled is an amine solution. Does a too high mesh size have a significant impact on the pump?
Magnetic pumps are most sensitive to vacuum conditions; it is recommended not to use a sieve with too fine mesh
Magnetic pumps generally don’t behave like this. Do your materials contain magazine particles? 60 mesh is recommended.
Given that the pump is of reliable quality (with good dynamic balancing), if it’s only the bearings that are damaged, there are two possible scenarios: either the pump is running idle, or there are solid particles present. Based on your description, you should use SiC bearings; SiC is relatively brittle and prone to breaking. If you are only transporting ammonia liquid, it is recommended to use graphite (carbon) bearings; such bearings are softer and can self-lubricate in a short time. However, generally speaking, the pump should not run idle either. So you need to find the root cause. If it’s a particle issue, I believe not only the bearings but also the pump’s front casing (flange) will show signs of wear; take it apart and check carefully. The idling problem can be avoided through proper operation. If there are particles present, it is recommended to make the pump pipeline at the storage tank slightly above the bottom of the tank. It is generally not advisable to use filters with a high mesh size, as this can affect the performance of the pump. Additionally, if it is caused by liquid crystallization, the pipeline needs to be cleaned before turning off the pump (by flushing with water).
Amine solution crystallizes when its temperature is too low, right?
A filter should be installed in front of magnetic pumps, especially at the beginning of operation; once there are fewer impurities and no large-sized particles present, then a filter with a finer mesh size can be used.
30-40 mesh is normal. 1. What is your flow rate? This is very important. 2. Are there frequent fluctuations in the flow rate? 3. Not all magnetic pump models cannot tolerate the presence of impurity particles. 4. Why did the manager ask for the addition of a filter? What is the reason behind this? 6. A too high mesh size has a certain impact; could excessive resistance be causing incomplete feeding? 7. Also, consider the installation height – will the device’s net positive suction head be sufficient to overcome the pressure requirements? 8. Are there any issues such as gas-liquid mixing in the flow?
Magnetic pumps often use filters in the form of magnetic rods; when performing maintenance, it is necessary to check whether the thrust disc is worn out Wear and tear is caused by vacuum conditions; most damages to magnetic pumps are resulting from improper operation