Typical Acceptance Values

Bringing the motor shaft into alignment with
the pump shaft usually involves moving the front
and rear feet of the motor, vertically and horizontally,
until the shafts are aligned within acceptable
tolerances.

In addition to their dependency on data such as
speed of rotation, horsepower, spacer length, shaft
size, etc., acceptable alignment tolerances also
depend, to a large extent, on the level of reliability
the pump user expects. Accordingly, every end user
should develop acceptance levels that provide their
particular desired outcomes.

The tolerances in Table 1 are not intended as
definitive values, but can be used as a starting point
for developing tolerances that will be specific to an
individual company or equipment. They represent
the maximum allowable deviation from the desired
value, whether that value is zero or a targeted misalignment
to allow for thermal growth of the equipment.