Chipping of the graphite static ring
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The main seal of the graphite static ring is in good condition, but there is some chipping in the surrounding area. The auxiliary sealing ring is an O-ring; please help discuss the possible causes of this issue. Rotational speed: 500; medium: water; the moving ring used in conjunction with it is made of cemented carbide
In cases where it is impossible to determine with the naked eye, it is likely that there is micro-level deformation of the end face; the key is to check whether there is damage on the outer diameter or on the inner diameter. If there is damage on the outer diameter, it means that the end face was in external contact during operation； If there are chipped teeth on the inner diameter, internal contact occurred at the end face during operation. Simply put, it means the end surface becomes uneven during operation. If possible, the removed sealed end face can be gently ground on a grinding plate, and then inspected under an optical flat; different patterns will appear, and these patterns can reflect the traces left during operation.
Is there a hard object inside the medium, or is the compression too great?