Problems with damage to Haimitec shielded pumps
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Our company has over thirty Hammett pumps. During recent successive use, problems of continuous damage have occurred, mainly with horizontal and vertical single-stage pumps. The impeller, wear plates, shaft sleeves, and all the ring gaskets of each pump are worn out. The manufacturer’s staff determined that dry wear was caused by a faulty filling pump. However, even after replacement and repair, issues such as significant noise, wear, and excessive current continued to occur. The return-to-factory report indicated that the pump shaft was bent. Have any of you sea friends encountered this situation? Because such problems rarely occurred when using Imperial shielded pumps before. What else needs to be taken into consideration during the repair of pumps from this brand? I hope Haiyou can provide some information
Was the original poster’s issue resolved later? How was it resolved? Is it possible to share that? To give more marine enthusiasts a chance to learn*
The last edit to this post was made by 3983596 on 2018-9-17 at 12:58. The shaft of a canned pump comes into contact with the medium, and corrosion-resistant materials are generally used for it; as a result, its strength is much lower than that of carbon steel shafts. Under normal operating conditions, there are no problems, but in the event of faults within the pump, such as wear of the sealing rings or wear and binding of the inner rotor components, extremely high forces and torques can be generated momentarily, exceeding the strength of the shaft and leading to shaft deformation as well as damage to related components. Therefore, when repairing such pumps, in addition to replacing and fixing the damaged parts, a thorough inspection of all related components that may be affected is also necessary. This includes checking for any movement or deformation in various areas, as well as performing balance checks. The focus should be on the rotor components and seal rings, as well as sliding bearings and stator sleeves. Only after everything is in order can the pump be installed and put into use. In my opinion, pumps such as shielded pumps and magnetic drive pumps can have a very long service life if the operating conditions are stable, with no abnormal fluctuations or impurity particles present, and if they are operated and maintained according to the proper guidelines. In such cases, they can essentially function without maintenance, which is much better than ordinary centrifugal pumps. However, if the operating conditions are complex and subject to frequent fluctuations, if there are many impurity particles or foreign objects present, or if the pumps are not used properly or are mishandled, then failures will occur frequently, and their stability will be far inferior to that of centrifugal pumps. Therefore, sensitive pumps require a favorable operating environment and proper usage in order to function reliably over a long period of time.