Goulds Pumps XHD - IOM - Manual (Page 31)

Installation
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) Prior to operation when the pump and the driver are at ambient
check temperature.
Final alignment (hot alignment) After operation when the pump and the driver are at operating
check 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 the total indicator runout is a maximum of 0.004 in. (0.10 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.
Recommended settings for model XHD
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
XHD Installation, Operation, and Maintenance Manual 29