Erosion leakage at the root of the isolation sleeve head of the magnetic pump
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This post was last edited by 3983596_FPPZ on 2018-11-3 07:31. The isolation sleeve of a magnetic pump is a very important component; it features corrosion resistance, high strength, high material resistance, and good weldability. However, the thickness of the isolation sleeve is quite thin. Have you encountered erosion or even leakage at the root area (where the head is connected to the cylinder)? How was it solved? Should it be to change the shape of the bottom of the head, simply replace the damaged parts, or weld a reinforcement plate to the bottom of the head?
This happens occasionally with us, and it seems to be related to impurities in the medium as well as the temperature of the medium.
The main reason is likely medium vaporization, which leads to vortex erosion at the junction between the head and the cylinder
Water hammer can cause such failures. Then there are the issues of material corrosion and processing techniques. Theoretically, there is only self-circulating flow near the isolation sleeve, and the erosion there is far less severe than that at the pump front casing and impeller.
The rotation of the medium inside the isolation sleeve creates vortices, which cause continuous mechanical wear at the joints of the housing. If it’s just one unit, then it’s either a manufacturing issue or related to the operating medium.