What causes leakage when a newly installed mechanical seal is in operation?
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The reasons for leaks occurring shortly after a newly installed mechanical seal comes online are mostly related to installation issues. 1) The designed end face specific pressure is too low to meet the end face specific pressure required for sealing ； 2) The spring compression is too small ； 3) The roughness of the sealed end face does not meet the requirements ； 4) The flatness of the sealed end face is insufficient ； 5) The sealing ring deforms under the influence of factors such as pressure and temperature, thereby compromising the flatness of the sealing surface ； 6) The moving ring is stuck in the drive seat ； 7) Misalignment of the stationary and rotating rings ； 8) The load coefficient in balanced seals is inappropriate (often too small) ； 9) In bellows seals, the inner and outer diameters of the bellows are not appropriate.
Leakage in a newly installed mechanical seal may be due to improper installation or incorrect design parameters. The specific reasons include too low end-face specific pressure, insufficient spring compression, substandard roughness of the sealing end face, inadequate flatness of the end face, deformation of the sealing ring due to temperature and pressure effects, jamming of the moving ring, misalignment of the moving and stationary rings, improper setting of the load coefficient for balanced seals, or inappropriate dimensions of the bellows in bellows-type seals. Solving these problems usually requires adjusting the installation or redesigning the sealing parameters. .
In fact, most of the above problems do not occur. The only possibility is that damage to the mechanical seal leads to a deterioration in the smoothness of the shaft surface; failing to carry out smoothing treatment will result in further damage to the mechanical seal. This is provided for reference only.
It depends on the situation. Mechanical seals are precision machinery, and they can be affected by external factors during production, transportation, storage, and installation; there are various reasons for their damage, and equipment problems are one of them.
This post was last edited by CHANGBAISHI on 2024-8-1 07:37. The mechanical seal also needs to be inspected before it is replaced; the more focused the discussion on an issue is, the more targeted it becomes, which makes it easier to solve the problem. Regarding what you mentioned – that \"it can be affected by external factors during production, transportation, storage, and installation\" – I think problems other than those related to installation are unlikely to occur. I don’t want to dwell too much on such issues here; if problems like production, transportation, and storage are used as excuses for analyzing things, well, it’s simply unacceptable. If you were to raise such a question at an accident analysis meeting, haha, then you would indeed be very talented. For reference.
There is a gap between theoretical arguments and what actually happens on site; you might want to learn more about the situation there