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........................................................................................................................................................................................................................... Pump Installation & Piping

If the run out on the pump side is in excess of the normally acceptable
limit of 0.002 inches, the pump shaft run out should be checked as
above, except with the dial indicator applied to the shaft. If the shaft
run out is 0.001 inch or less, then the shaft can be considered
acceptable, but the coupling is eccentric. If however, the shaft run out
is greater than 0.001 inch, the shaft should be straightened or replaced.
By switching the position of the dial indicator, the driver shaft can be
checked in the same manner with the same limitations.

0.3.6 Soft foot
To check for soft foot prior to alignment when there are no shims
under the motor feet, start out by trying to fit a 0.005 inch shim under
each foot. If the shim will fit under a foot, make up the gap by
gradually increasing the shim thickness until a fight fit is achieved. If
shims do exist already, ensure that there are no more than 4 shims in
any one location. If there are, consolidate them by using thicker shims.
Check at each foot for loose shims and make up the gap by gradually
increasing the shim thickness until a fight fit is achieved at all feet.
A final soft foot check should be performed only after any vertical
angular misalignment has been corrected. When that has been achieved,
mount the dial indicator to contact the foot to be checked and set the
indicator to zero. Loosen the hold down bolt on that foot and record
the dial indicator reading, and then retighten the hold down bolt.
Repeat this process with all four feet.
Soft foot conditions in excess of 0.002 inch should be corrected by
adding shims to the foot with the largest soft foot value. Note that
excess shims will result in increased soft foot at the other feet. Check
other feet and make any necessary corrections.

0.3.7 Alignment methodology

While dial indicators are still a viable method of establishing shaft
alignment, laser alignment systems are now providing increased
accuracy that reduces maintenance costs while improving pump
reliability. In the current industrial workplace where fewer people are
expected to do more, laser alignment systems not only reduce the time
required to achieve a high level of alignment accuracy, but they do so
without the need for any expertise in mathematical graphing and
calculation.

10.3.8 C-Flange adapter
One of the major benefits of having a C-Flange mounting arrangement
where the pump and motor are fitted to a common adapter. With this
design shaft alignment is not required, as the rabbeted fits of the motor

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