Goulds Pumps 3171 - IOM - Manual (Page 26)

Types of alignment checks
Type of check When it is used
Initial alignment (cold alignment)
check
Prior to operation when the pump and the driver are at ambient
temperature.
Final alignment (hot alignment)
check
After operation when the pump and the driver are at operating
temperature.
Initial alignment (cold alignment) checks
When Why
Before you grout the baseplate This ensures that alignment can be accomplished.
After you grout the baseplate This ensures that no changes have occurred during the grouting process.
After you connect the piping This ensures that pipe strains have not altered the alignment.
If changes have occurred, you must alter the piping to remove pipe
strains on the pump flanges.
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 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 feet are tight
when you take indicator measurements.
This keeps the driver stationary since
movement causes incorrect measurement.
Make sure that the hold-down bolts for the driver feet 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
adjustment 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).
Installation (Continued)
24 Model 3171 Installation, Operation, and Maintenance Manual