When
Why
Periodically
This follows the plant operating procedures.
4.4.2 Permitted indicator values for alignment checks
NOTICE:
The specified permitted reading values are valid only at operating temperature. For cold set-
tings, other values are permitted. The correct tolerances must be used. Failure to do so can
result in misalignment. Contact ITT for further information.
When dial indicators are used to check the final alignment, the pump and drive unit are correctly aligned
when the total indicator runout is a maximum of 0.05 mm | 0.002 in. at operating temperature.
4.4.2.1 Cold settings for parallel vertical alignment
Introduction
This section shows the recommended preliminary (cold) settings for electric motor-driven pumps based
on different temperatures of pumped fluid. Consult driver manufacturers for recommended cold settings
for other types of drivers such as steam turbines and engines.
Recommended settings for model 3180 and 3185
Pumped fluid temperature Recommended setting for driver shaft
10°C | 50°F
0.05 mm | 0.002 in., low
65°C | 150°F
0.03 mm | 0.001 in., high
120°C | 250°F
0.12 mm | 0.005 in., high
175°C | 350°F
0.23 mm | 0.009 in., high
218°C | 450°F
0.33 mm | 0.013 in., high
4.4.3 Alignment measurement guidelines
Guideline
Explanation
Rotate the pump coupling half and the driver coupling half together
so that the indicator rods have contact with the same points on the
driver coupling half.
This prevents incorrect measurement.
Move or shim only the driver in order to make adjustments.
This prevents strain on the piping installations.
Make sure that the hold-down bolts for the driver are tight when
you take indicator measurements.
This keeps the driver stationary since move-
ment causes incorrect measurement.
Make sure that the hold-down bolts for the driver are loose before
you make alignment corrections.
This makes it possible to move the driver when
you make alignment corrections.
Check the alignment again after any mechanical adjustments.
This corrects any misalignments that an adjust-
ment may have caused.
4.4.4 Attach the dial indicators for alignment
You must have two dial indicators in order to complete this procedure.
1.
Attach two dial indicators on the pump coupling half (X):
a) Attach one indicator (P) so that the indicator rod comes into contact with the perimeter of the
driver coupling half (Y).
This indicator is used to measure parallel misalignment.
4.4 Pump-to-driver alignment
Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual
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