Once the shielding sleeve of a shielded pump is corroded and damaged, it must be sent back to the factory for repair. The costs associated with such repairs are high, and it also causes delays in production. Is this…
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This post was last edited by jmdc on 2019-2-19 at 21:44. Once the shielding cover of a canned pump is corroded and damaged, it must be sent back to the factory for repair. The repair costs are high, and it also causes delays in production. Is this a fatal flaw of canned pumps? Does the shielding sleeve belong to the vulnerable parts of a shielded pump? How long can a regular shielding sleeve last?
The key is to analyze the reasons for the damage to the shielding sleeve. Shielded pumps have a relatively high entry barrier; as long as the selection does not deviate too much from the actual operating conditions, the main causes of damage can be attributed to issues such as improper exhaust or interruption in fluid flow. Discussing the operating conditions can help in analyzing the problem
The difficulty in repairing shielded pumps is indeed a drawback; one can try using magnetic pumps, which are just as good as shielded pumps.
How can this be considered a flaw? Use a reputable manufacturer’s product and operate it under appropriate conditions; pay attention to checking it during each major repair, and it should definitely work fine for ten years. It is precisely because shielded pumps are not prone to breaking that they are expensive, which allows people to use them with confidence.
Under normal circumstances, if the shielding sleeve is damaged, the pump cannot operate properly and must be sent back to the factory for repair. This is currently the biggest drawback of shielded pumps. Components such as the shielding sleeve and bearing shells are considered vulnerable parts in shielded pumps. If the medium is clean, a shielding sleeve can typically last 2–3 years. It is recommended to use a filter in the pump head to filter the medium.
For shielded pumps, it is very difficult for maintenance personnel to repair the shielding sleeve, and this constitutes a fatal weakness of such pumps. Therefore, when selecting equipment, one should avoid using shielded pumps for media that have high temperatures, tend to crystallize, contain solid particles, or are prone to vaporization.
If the right model is chosen, the shielding sleeve is not considered a vulnerable component; with proper maintenance, it does not need to be replaced for ten or eight years. Corrosion or leaks are issues resulting from an incorrect choice of model. The reasons for the wear of the shielding sleeve are, first, crystallization, and second, eccentricity caused by excessive bearing wear ； Third is cavitation or air erosion; controlling these aspects will resolve the problem.
The shielding sleeve is not a wear part; its service life and mechanical life are the same. Generally, wear of the shielding sleeve is due to poor maintenance; returning the pump to the factory for repair does indicate a problem with the shielding pump. However, it’s normal for a shielding pump to function properly for 10–18 years without requiring major repairs when it is well-maintained