Installation
236 Series Twin-Screw Pump -
Installation, Operation & Maintenance Manual
29
Follow the instructions from the equipment manufacturer when you use the reverse dial
indicator or laser methods. Detailed instructions for using the dial indicator method are
contained in this chapter.
Alignment checks
When to perform alignment checks
You must perform alignment checks under these circumstances:
•
The process temperature changes (as this will affect the thermal growth of the pump).
•
The piping connected to the pump is removed and reinstalled or replaced.
•
The pump has been serviced and/or disassembled (partially or fully).
Types of alignment checks
Type of check
When it is to be 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 later.
After you grout the baseplate
This ensures that no changes have occurred during the grouting and
foundation bolt tightening process.
After you connect the piping
This ensures that pipe strain has not altered the alignment.
If changes have occurred, you must revise the piping arrangement
and/or piping supports to remove pipe strains on the pump flanges.
Final alignment (hot alignment) checks
When
Why
After the first run
This ensures that no unexpected movement of the pump or driver
has occurred.
Periodically
Follow the plant operating procedures for periodic checks.
