Thermal Growth - It is the amount of machinery movement, both horizontal and vertical, due to temperature change.
Dynamic Movement - It is the total amount of equipment movement by all factors such as pipe stress, including thermal growth.
Some machines are intentionally misaligned in the (Ambient Temperature) so they move into alignment as they operate in the (Operating Temperature).
To compensate for this dynamic movement, we use ( OL2R ) which is Off-Line to Running application on (Fixurlaser NXA).
Methods of performing alignment in cases of thermal growth;
TLC Method
Temp. Difference x Linear Dimension x Coefficient
Average Temp Change x Length between shaft center and leg x Material Factor = Expansion Value
Apply this value to each foot of the machine in order to compensate the value of such growth while performing cold alignment.
Hot & Cold Check Method
Take alignment measurement when machine is cold
Start the machine and wait till it reach the normal operating conditions then stop and take another alignment measurement.