Leakage at the centrifugal pump shaft sleeve
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The centrifugal pump is not running, and there is dripping at the shaft sleeve – 1-2 drops per minute. Is it due to an excessive clearance between the shaft sleeve and the shaft, or has the O-ring inside the shaft sleeve failed? Some people say that the impeller nut lacks a washer or is loose. Is that true?
Yes. -------------------------
“Some people say it makes sense; some pumps have PTFE gaskets at the joint between the impeller and the shaft, or PTFE gaskets beneath the back cap, and if these gaskets are not tight, fluid will leak from the shaft sleeve； It’s also possible that the O-ring is damaged.
Where can I see if there is dripping at the shaft sleeve? ”
There is a high likelihood that no gasket is used for the impeller nut, or that it is loose; relative movement between the shaft sleeve and the shaft causes the O-ring to fail
If it’s the shaft sleeve and the shaft that are leaking directly, then it must be for the reason you mentioned
Cantilever single-stage centrifugal pump: Water leaks out from the shaft sleeve and drips down along the shaft
Is it leaking from the inside or the outside of the bushing? It’s crucial. If there is a leak inside, it’s the situation mentioned by the people above.
All the situations you mentioned can cause leakage at the shaft sleeve. To determine if there is a problem, one can check whether the pump operates stably and whether there are any abnormal noises; factors such as the gap between the shaft sleeve and the shaft, as well as the proper tightening when installing the impeller cover, also play a role.
Let’s talk about those two static seal gasket issues