Analysis of the failure of the mechanical seal of the sanitary centrifugal pump①

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The shutdown of the sanitary centrifugal pump is mainly caused by the failure of the mechanical seal. Most of the failure manifestations are leakage. The reasons for leakage are as follows:  

① The main reasons for the leakage of the sealing surface of the dynamic and static ring are: the flatness of the end surface, the roughness does not meet the requirements, or the surface is scratched; there is particulate matter between the end surfaces, which causes the two ends to not operate at the same time; the installation is not in place and the method is incorrect.  

②The leakage of the compensation ring sealing ring is mainly caused by: the gland is deformed, the pre-tightening force is uneven, and the installation is incorrect;

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