Issues regarding the replacement of modular mechanical seal components
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I have just started working with rotating equipment, and there are many things I don’t understand. When a modular mechanical seal leaks, should it be replaced entirely, or just the sealing element?
Generally, a complete replacement is not carried out; only the rotating and stationary ring friction pairs, as well as the sealing elements (O-rings, PTFE V-rings, graphite gaskets) are replaced. Damage to components such as shaft sleeves, sealing gland caps, and the elastic elements of the compensation mechanism will also be repaired if it is detected. As long as the corresponding replacement is made, that’s sufficient
Agree with the person above; I support it!
That’s broken; use that one instead. . . . . . . . . .
The installation method of the cartridge seal can be the same as that for regular mechanical seals
We usually use the same method as on the 2nd floor
If the end face is damaged, it’s better to replace the entire unit. The dynamic and static rings account for a large proportion of the cost of the entire sealing system, and sealing manufacturers have extensive experience in assembling such components, so no problems should arise. If other parts are damaged, they can be replaced individually, but the assembly must still meet the required standards. By replacing the spring, it is possible to simply determine the new spring specific pressure and end-face specific pressure; once these values are determined, the spring can be purchased~~
Generally, it is replaced entirely, and after repair, used as a spare part. If a complete set of spare parts is not available, the damaged component can also be replaced and installed after assembly.
Check whether your organization pays attention to funding; if not, replace it entirely!
Under normal circumstances, the sealing gland is not prone to damage; the parts that are most likely to get damaged are the shaft sleeve gaskets, the sealing gland gaskets, the moving ring gaskets, the stationary ring gaskets, as well as the friction surfaces between the moving and stationary parts in the sealing mechanism. Some shaft sleeves may get stuck, and there can also be issues with cracks in the bellows themselves
Once a modular mechanical seal starts leaking, it must be replaced in its entirety, as it is already adjusted at the time of manufacture. If you disassemble it and reinstall it, the fit is likely not to be as good as that achieved by the manufacturer. I suggest replacing it entirely. In our company, modular mechanical seals are generally replaced in their entirety; the old ones can be repaired and used as spare parts!