SUBJECT: Shaft displacement cheat sheet 9-2

We know that seals fail for only two reasons:

Common sense dictates that the more the shaft deflects from the center of the stuffing box, the more likely the lapped faces are to separate. Rotating seals (the spring loaded face rotates with the shaft) are very sensitive to this type of shaft displacement or any other form of misalignment between the stationary and rotating faces.

THE PUMP IS OPERATING OFF THE BEST EFFICIENCY POINT (BEP)

THE PUMP IS CAVITATING

THE PUMP IS VIBRATING

OTHER CAUSES OF SHAFT DISPLACEMENT

THE STUFFING BOX IS CAUSING THE MISALIGNMENT PROBLEM

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