Goulds Pumps IC - IOM - Manual (Page 25)

When Why
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.
IMPORTANT
• For electric motors, the motor shaft initial (cold) parallel vertical alignment setting should be 0.002 to
0.004 in. (0.05 to 0.10 mm) lower than the pump shaft.
• For other drivers such as turbines and engines, follow the driver manufacturer's recommendations.
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.
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.
NOTICE: For electric motors, the motor shaft setting should be 0.002–0.004 in (0.05–0.1 mm) lower
than the pump shaft. For other drivers, follow the driver manufacturer's recommendations.
Recommended settings
Pumpage temperature Recommended setting
50°F (10°C) 0.002 in. (0.05 mm), low
150°F (65°C) 0.001 in. (0.03 mm), high
250°F (120°C) 0.005 in. (0.12 mm), high
350°F (175°C) 0.009 in. (0.23 mm), high
450°F (218°C) 0.013 in. (0.33 mm), high
550°F (228°C) 0.017 in. (0.43 mm), high
650°F (343°C) 0.021 in. (0.53 mm), high
700°F (371°C) 0.023 in. (0.58 mm), high
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.
Installation
Model IC, ICI, ICH, ICIH Installation, Operation, and Maintenance Manual 23