Goulds Pumps 3298 - IOM - Manual (Page 28)

Installation
Final alignment (hot alignment) checks
When Why
After the first run This ensures correct alignment when both the pump and the driver
are at operating temperature.
Periodically This follows the plant operating procedures.
Permitted indicator values for alignment checks
NOTICE:
The specified permitted reading values are valid only at operating temperature. For cold
settings, other values are permitted. You must use the correct tolerances. Failure to do so can
result in misalignment and reduced pump reliability.
When dial indicators are used to check the final alignment, the pump and drive unit are
correctly aligned when these conditions are true:
• The total indicator runout is a maximum of 0.002 in. (0.05 mm) at operating temperature.
• The tolerance of the indicator is 0.0005 in./in. (0.0127 mm/mm) of indicator separation at
operating temperature.
Alignment measurement guidelines
Guideline Explanation
Rotate the pump coupling half and the driver This prevents incorrect measurement.
coupling half together so that the indicator rods
have contact with the same points on the driver
coupling half.
Move or shim only the driver in order to make
This prevents strain on the piping installations.
adjustments.
Make sure that the hold-down bolts for the driver
This keeps the driver stationary since movement
feet are tight when you take indicator measure- causes incorrect measurement.
ments.
Make sure that the hold-down bolts for the driver
This makes it possible to move the driver when you
feet are loose before you make alignment correc- make alignment corrections.
tions.
Check the alignment again after any mechanical
This corrects any misalignments that an adjustment
adjustments. may have caused.
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.
26 3298 Family Installation, Operation, and Maintenance Manual