Page 404 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

302 Major Process Equipment Maintenance and Repair

4. Replace the bearing cap covers (58) and tighten bolts (59), if appli-
cable.

Rotor Assembly

The rotor assembly must be removed from the turbine casing before
removing or replacing the following (Refer to Figure 8-5):

1. Oil Rings (49)
2. Shaft Sleeve Seals (47)
3. Trip Body (52)
4. Rotor Locating Bearing (50)
5. Nozzle Ring (33)
6. Reversing Blade Assembly (37)
7. Bearing Housings (12, 21, 53 and 54)
8. Packing Cases (10 and 11)

Removal

1. Disconnect the coupling between the turbine and driven machine.
2. Remove the turbine casing cover (3 and 64, Figure 8-5), top half
packing cases (10 arid 1 1) and carbon rings (9) as described earlier.
3. Remove the journal bearing liners (15 and 16) as described in Dis-
assembly Section.
4. Disconnect the governor linkage and remove the governor as out-
lined in the Governor Maintenance Section (page 405).
5. Place a sling between the rotor disks (44 and 45), and slowly lift the
rotor approximately 1 in. (25 mm).
Caution: Keep the rotor level when lifting, to prevent binding it in
the casing or damaging machined surfaces.

6. Lift the oil rings (49) from the bearing housings. Move the rings to
the side so that they are free of the bearing housing support cast-
ings, then lift the rotor assembly out of the turbine casing.
Caution: Chock the rotor assembly with blocks to prevent it from
rolling when removed from the casing. Also protect the
rotor journals and carbon ring sealing areas by wrapping
them with clean rags or other suitable covering.

Clearances
Refer to the Cold Clearance Diagram, Figure 8-10, for rotor dimensions.