Goulds Pumps 3180-86 - IOM - Manual (Page 34)

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 the total indicator runout is a maximum of 0.002 in. (0.05 mm) 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.
Models 3181 and 3186 should be set at 50°F (10°C) for all temperatures due to the centerline-mounted
casing.
Recommended settings for model 3180 and 3185
Pumped fluid temperature Recommended setting for driver shaft
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
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
32 Models 3180, 3181, 3185, and 3186 Installation, Operation, and Maintenance Manual