Please note that in this paper I identify a rotating seal as one that has the springs rotating with the shaft and a stationary seal as one where the springs do not rotate, but instead remain stationary in the gland. Self - aligning seals have springs in both the stationary and rotating faces.

Most seal failures are associated with shaft displacement. See “Shaft displacement problems” for details.

Physical causes of the faces opening:

Installation errors:

The easiest way to tell if you are having seal face opening problems is to inspect the hard face for evidence of wear. Common sense dictates that carbon cannot wear a hard seal face.

If the lapped faces open for any reason, they will allow solids to penetrate between the faces and embed into the softer carbon when the faces close. The contaminated carbon will then act as a grinding surface making wear marks in the harder face.

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