Page 270 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

252 Major Process Equipment Maintenance and Repair

H. S. Shaft
Towards Gear

I-
O
Center of Journal a y 9
Running Position
- I
5
Center of Journal .-
at Cold Position I

Figure 6-26. Example of thermal movement.

Dowel Pins

Gear Unit
0
8

Figure 6-27. Ideal cold alignment example.

In the example illustrated in Figure 6-26, the thermal and mechanical
movements have been determined as .007 in. vertical and .002 in. horizontal
toward the gear. Using these values, the cold indicator reading should be as
shown in Figure 6-27. In this example the assumption is made that the pump
remains in the ambient condition. If this supposition is not true, the indicator
readings must be corrected for the pump movement.