4.5.1 Alignment checks
When to perform alignment checks
You must perform alignment checks under these circumstances:
•
The process temperature changes.
•
The piping changes.
•
The pump has been serviced.
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 op-
erating temperature.
Periodically
This follows the plant operating procedures.
4.5.2 Permitted indicator values for alignment checks
NOTICE:
The specified permitted reading values are valid only at operating temperature. For cold set-
tings, other values are permitted. The correct tolerances must be used. Failure to do so can
result in misalignment. Contact ITT for further information.
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 0.10 mm | 0.004 in. at operating temperature.
4.5.2.1 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.
4.5 Pump-to-driver alignment
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