Goulds Pumps 3796 i-FRAME - IOM - Manual (Page 42)

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.
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.
Recommended settings for model 3796
Pump 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) Not applicable
700°F (371°C) Not applicable
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):
Installation (Continued)
40 Model 3796 i-FRAME Installation, Operation, and Maintenance Manual