What is the normal service life of a coupling diaphragm?
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RT, the coupling diaphragms of the centrifugal pumps in our company have broken down in large numbers recently – they’ve worn out. The pumps have been in use for 1.5 years now, with two pumps operating simultaneously while one serves as a backup
The main cause of damage to the coupling laminations is misalignment of the motor; to extend the lifespan of the coupling, it is essential to ensure accurate alignment. It is normal for the laminations to last for two to three years
The lifespan of the coupling diaphragm depends on the material chosen. If Wuxi Chuangming couplings are chosen, their normal service life is over 5 years.
If the selection has nothing to do with quality, then it’s caused by poor assembly
There are two possibilities: first, the quality is poor – check for any deformation, and also examine the bolts to see if there is any deformation in the wheels; second, the coaxiality is not good – it’s necessary to align them properly after each installation
If a diaphragm coupling has been in use for over 5 years, it is necessary to consider replacing the diaphragm, the diaphragm fastening pins, and the pin sleeves. If the alignment is not proper, it won’t last more than 5 years; perhaps it needs to be replaced after 1 year. The successor machinery must take the alignment results into account.
In our company, we basically need to replace 1 to 2 couplings per month: L. The main reason is probably that the motor shaft and the pump shaft are not aligned.
Don’t you have mechanics? Won’t you do any alignment?
The unit has only one part-time equipment technician, and no professional equipment; they can only rely on a level and their eyes to level things out...
No level is needed – just a saw blade! Make sure to align it properly
It is very likely that poor concentricity is the cause of the diaphragm breaking easily. Using a saw blade is not precise; the double gauge alignment method should be used