Things to note when replacing mechanical seals
Thread Content
Today there was a pump to replace the mechanical seal. The equipment man brought a new set of seals of the same model. I didn’t think much about replacing them and found that I couldn’t crank the pump. After re-opening it, it was found that the seal had lost its compression and was crushed to death, but the seal of the pump was fixed and non-adjustable. After comparison and measurement with the removed old seal, it was found that the size of the new seal was different from the old seal. The bottom seat of the moving ring was 1.3mm higher. The problem was solved after the old bottom seat was replaced. Later, I asked the equipment technician to change the manufacturer of the seal, causing its size to be different from the original one. . . . . . The O-ring of the moving ring also cannot spring up after being pressed down too much. . . . . . I don’t know if anyone has encountered this situation, so please pay attention when installing it in the future. :)
I have also encountered this problem. Mechanical seal models from different manufacturers are interchangeable, but there are still differences. Our mechanical seal was originally imported from Bergman, but was later changed to domestically produced. This problem occurred. It is usually invisible and can only be inspected and compared before installation to avoid rework by maintenance personnel.
Of course I have. This is a problem often encountered in the process of localization. Gradually there will be other problems that are even more surprising to you. If no positioning holes are machined. The fixing hole of the moving ring is not opened. Be sure to check carefully before use.
Really learned a lesson:):):):):):):):):):):):):):):)
I agree with the point above. The most important thing is to check before assembly. Although most of the mechanical seals are now modular, which is very convenient to assemble, inspection before assembly is still critical and can avoid wrangling after the mechanical seal is damaged.
Chinese seals may often encounter this problem, so it is best to measure the compression of the seal and then calculate the end face specific pressure.
You can refer to the posts on the site http://bbs.hcbbs.com/thread-979833-1-1.html
Our factory often encounters similar problems. In order to better monopolize the market, current mechanical seal manufacturers often make mechanical seal accessories that are different in size from the original pump. Unless all the products they provide are installed, including the shaft sleeve and gland, they can be replaced together. When replacing the next time, pay attention to comparing the new accessories with the old ones, and the measurement numbers and sizes to avoid further trouble.
Therefore, seal replacement manufacturers must pay attention to the first time
How much compression does your mechanical seal have? Is it a balanced or unbalanced type? ? ? ? ? ? ? ? ? ? ? ? ? I thought I wouldn't be able to sit still. It might be a bit difficult, but I wouldn't be unable to move.