Analysis of 16 Problems in Failure of Mechanical Seal of Centrifugal Pump

The following example causes the failure of the mechanical seal of the centrifugal pump for service personnel's reference. Mechanical damage ⑴, the end surface roughness is less than the standard or scratched the surface; ⑵ medium is not mixed with granular impurities, centrifugal pump in operation, the medium in high-speed movement, the end surface of the plan. ⑶, gland force deformation, uneven pre-tightening force, resulting in seal damage; ⑷, the media meet the condensation of frozen spring, resulting in seal damage; ⑸, the actual output of the centrifugal pump smaller, so a lot of medium in the pump Internal circulation, heat accumulation, causing gasification of the medium, leading to seal failure; ⑹, ring material selection error, the choice of hard alloy, engineering ceramics, graphite and other brittle material sealing ring, sometimes there will be radial cracks on the end face, causing rapid wear and tear parts ; ⑺, Centrifugal pump due to taking the time, cavitation lead to a sharp increase in pressure within the pump, resulting in seal damage; ⑻, Centrifugal pump has not been used for a long time, re-activation and no manual operation of the impeller may be damaged due to adhesions seal; Too tight, resulting in rapid wear sealing surface failure, but also to increase power consumption. ⑽, moving ring seal is too tight will make the spring spring damaged due to fatigue, but also will speed up the wear and tear between the ring and the sleeve, the seal failure. ⑾, transmission parts due to poor coaxiality, running during the friction due to shaking the end face, resulting in end vaporization, overheating wear. ⑿, centrifugal pump idle or seal off the water pipe, the sealing surface is dry grinding state, so that the seal damage. ⒀, Centrifugal pump installation or maintenance, installation screws tighten the seal resulting failure. Damage caused by thermal damage ⒁, seal the end face due to overheating and deformation, the formation of many dents, causing serious wear and tear so that the surface damage and seal failure. ⒂, high temperature caused seal parts aging, cracking and deformation, the sealing end of the lack of closure force leakage, resulting in loss of sealing performance. Corrosive damage ⒃, Seal components are corrosive medium erosion for a long time, leading to seal damage. Centrifugal pump mechanical seal is a high demand, its use in the assembly, maintenance and even selection are required, we should pay more attention to it, should be treated with caution, to take effective solutions, but also to do Good routine maintenance and care to ensure the safe operation of centrifugal pumps.

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