Final alignment (hot alignment) checks
When
Why
After the first run
This ensures correct alignment when both the pump and the driver are at op-
erating temperature.
Periodically
This follows the plant operating procedures.
4.4.2 Permitted indicator values for alignment checks
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.
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.
b) Attach the other indicator (A) so that the indicator rod comes into contact with the inner end of
the driver coupling half.
This indicator is used to measure angular misalignment.
4.4 Pump-to-driver alignment
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Model ICO i-FRAME, ICOH i-FRAME Installation, Operation, and Maintenance Manual
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