Reasons for seal leakage
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Seeking help: The seal of several pumps in the plant’s water production workshop is leaking recently. What are the causes of such seal leaks? Do I need to replace it if there’s a leak? I humbly ask for advice; please let the moderators point out any mistakes in my post
It mainly depends on what type of mechanical seal you have; some things can be adjusted, while others can only be replaced
There are many reasons for seal leakage; it depends on the type of mechanical seal. Those that can be repaired through grinding can still be used, while those that cannot be repaired need to be replaced with new ones
You didn’t explain it very clearly. In the case of minor leaks, it’s possible that over time the moving and stationary rings wear out severely, and in such a situation they need to be replaced! If leaks occur sequentially in several units, it is necessary to consider the impact of the process medium or the system, such as prolonged partial evacuation or poor water quality, which can cause impurities to block the compensation components or even damage the rotating and stationary rings
Mechanical seal leakage is mainly caused by wear of the sealing surface and insufficient pre-tightening force. Disassemble it to check the wear condition of the sealing surface and see if the spring is stuck
Mechanical seal leakage occurs in the following situations: 1. Leakage happens during operation； 2. There is no leakage during operation, but leakage occurs when it stops ； (There are two situations: no leakage upon reshipping, or continuous leakage.) 3. There is no leakage during operation, nor when it is stopped; however, leakage is detected only during the turning-over inspection ； 4. In the stopped state, leakage occurs immediately upon startup (either it occurs once and then stops, or the leakage persists) ； 5. Leakage may occur at different times—there is a possibility of it stopping on its own. There is a mechanism for all of these five situations; if you explain them clearly, I can help solve them.
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You need to tell everyone about your operating conditions, such as the medium and pressure, etc. It is also necessary to know whether it is a single seal or a double seal in order to analyze and solve the problems. Simply put, it’s impossible to tell; there’s also the design aspect to consider
The dielectric water can allow for minor leaks, as long as they are not excessive
If the mechanical seal is worn and causing leakage, it must be replaced; if the spring preload is insufficient, it can be adjusted. Over time, aging or damage to the O-ring of the stationary ring can also lead to leaks, and in such cases, only the O-ring needs to be replaced.