Mechanical seal leakage
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One of our company’s deaeration pump models DC50-80*6 has a newly installed pump head; however, the mechanical seal started leaking as soon as it was put into operation. The problem persisted even after replacing the shaft sleeve and the seal. If anyone knows a solution to this issue, please let me know! Thank you!
Where is the leakage from the mechanical seal? Is it inside the bushing? Friction pair? What should the temperature be during normal operation? What is the trial operation temperature? If the temperature of the medium is high during normal operation while the temperature during trial operation is at room temperature, it might be sufficient to increase the temperature.
Consider the sealing aspect – could there be an issue with the seal?
Is the medium water? Or is it some other substance? Is the sealing provided by the pump manufacturer?
I think the analysis provided by the poster on the second floor is quite accurate and comprehensive. I wanted to participate in the scoring, but was rejected with the message stating that \"your request came from an incorrect source and cannot be submitted.\" There’s nothing to do! I still can’t operate it yet.
Which side of the mechanical seal is leaking? Should we consider whether the balance tube is blocked? If there are no issues, it is still advisable to consider installing a mechanical seal; in addition to the rotating ring and the stationary ring, attention should also be paid to the sealing rings for both the rotating ring and the stationary ring
Could it be that the quality of the mechanical seal or its dimensional parameters are poor? Check whether the design requirements match the actual usage.
It’s not known to what extent the leakage occurs; if it’s not severe, there might be some leakage after installing a new seal due to processing reasons, but it will stop leaking after running in for a while. If the leakage does not decrease after 48 hours of running-in, it is necessary to consider whether the selection of the mechanical seal is appropriate (such as pressure parameters, temperature parameters, type of mechanical seal, etc.)
We have encountered this situation here as well; we can check whether there is a problem with the water discharge ring Check whether the balance disc is worn; if it is, the play gap can increase, affecting the amount of movement between the machine seals
Leakage in a mechanical seal is not necessarily due to a problem with the seal itself. Shaft play, excessive movement of the bearings, or shaft deformation can also cause leakage in the mechanical seal.
If the static sealing surfaces (the O-rings of the rotating ring and the stationary ring) are ruled out as the cause, it is likely that there is a deviation in the compression amount of the rotating ring. Generally, the compression amount of the rotating ring is adjusted accordingly based on the working medium, so that it makes proper contact with the stationary ring and prevents leakage caused by excessive looseness between them.