Help analyze the reasons
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The seal is a 108 series large spring, with an alkaline medium. How was that scar in the picture formed?
This kind of problem often occurs with the mechanical seal of alkali pumps; the analysis suggests that the O-ring corrodes and narrows, causing the moving ring seal to become loose. This allows relative rotation between the seal seat and the shaft sleeve, resulting in circumferential wear
Is the grinding of O-rings that intense? Learned* it
I suspect it was worn by the retaining ring on the spring below the O-ring; the photos at the scene aren’t very clear
Could you be more specific? Why is the corrosion so regular?
Pay attention to whether the wear marks are circumferential or axial. In the axial case, it may be due to insufficient spring compression, the pump operating under excessive pressure, or excessive axial movement that causes the sealing surfaces to keep opening and closing; the back-and-forth movement of the moving ring or O-ring then scratches the shaft sleeve.
If the grinding marks are caused by circumferential rotation, is your moving ring securely fixed circumferentially? What I saw was a circular pattern; the direction of wear indicated axial reciprocating wear.
I now suspect that the dynamic ring O-ring has corroded and failed, resulting in friction between the rings; the exact cause will be determined by our technical staff after an on-site inspection. Thank you, teacher, for your guidance