Rim and Face Shaft Alignment

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Why Align Rotating Equipment?

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• When two pieces of rotating equipment are connected through a shaft coupling, every effort should be made to minimize coupling and shaft misalignment. Proper alignment will reduce bearing, shaft and coupling failures, bearing and coupling temperature, vibration, and energy consumption. In addition, good alignment will extend equipment life between planned maintenance intervals. When considering how precise the alignment needs to be, consider alignment limitations of all the system components, not just the coupling. A flexible coupling is no excuse for excessive misalignment.

what is shaft misalignment?

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• For two shafts to be called “aligned,” their shaft center lines need to coincide. If together these center lines do not form one line, then either parallel misalignment (Fig. 1) And/or angular misalignment Exists (Fig. 2). In addition, as misalignment can exist in many directions, it is conventional to describe both of these misalignments in two planes, the vertical and the horizontal to define the complete alignment condition present.

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