J Line Pump
Horizontal Double Suction Centrifugal Pump ā API 610 Process Pump
30 V1.032818
4. Soft Foot
The fact that your equipment could have a soft foot can affect the alignment readings that you obtain.
The soft foot should be checked first and eliminated. This can easily be done by mounting a dial indicator
on the base plate indicating off the top of foot on the machine to be checked. Each foot in rotation is
then checked by loosening only the bolt with the rest of the bolts being tight. A soft foot check should be
carried out when the unit is stationary for safety reasons, and should be carried out on whole drive
train. It should never be necessary to shim under the pump mounting feet. Soft foot issues could
indicate excessive piping loads transmitted to the pump, or that the baseplate has been twisted, and is
not grouted and mounted flat.
B. REVERSE INDICATOR ALIGNMENT GRAPHICAL ANALYSIS
On a sheet of graph paper, lay out the equipment that you are trying to align. You should use a scale
that is convenient to the size of the graph paper. The distances that are critical are:
1. Distance from where the first indicator rides on the pump hub to where the second indicator
rides on the motor hub. In the example shown below, this is 10-1/2 inches (266.7 mm).
2. Distance from where the second indicator rides on the motor hub to the center of the front
motor feet. In the example below, this is 2-1/2 inches (63.5 mm).
3. Distance from the center of the motor front feet to the center of the motor back feet. In the
example shown below, this is 5-1/4 inches (133.4 mm).
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