Page 376 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Steam Turbines and Turboexpanders 355

fatal injury to personnel and extensive turbine damage. In the event the
trip system malfunctions: immediately shut down the turbine and correct
the cause.
5. If rubbing or vibration occurs during operation, immediately shut
down the turbine; investigate and correct the cause.

Preparing the Turblne for lnltial Startup

1. Disconnect the coupling between the turbine and driven machine
(turbines driving through reduction gears can remain coupled to
the gear and operated together).
2. Disconnect the steam inlet piping at the turbine and blow out the
line with the supply steam to remove any foreign material from the
Pipe.
3. Check to be sure the steam strainer (2, Figure 8-4) is clean and prop-
erly installed in the steam chest inlet flange. Connect the pipe to the
turbine with a permanent joint.
4. If operating condensing; clean rust preventative compound from
internal turbine surfaces.

Note: Rust preventative compound will foul surface condenser
tubes if not removed before operating the turbine.

5. Remove bolting from the steam end bearing cap (21 or 53, Figure 9-
5), and the exhaust-end bearing cap (12 or 54). Lift the caps approxi-
mately 1 in. (25 mm) and pry out the top bearing liners (16, Figure 8-
5) to release the oil rings (49). Remove the bearing caps and roll out
the bottom bearing liners (15), by rotating them away from their
positioning lugs. Clean and inspect the bearing liners.
6. Clean the rotor shaft journals and the bearing housing oil reservoirs
with clean, lint free rags. Flood the rotor locating bearing (50) and
shaft journals with oil. (See Chapter 12 for proper oil levels and
lubrication requirements.)
7. Lift the weight of the rotor and roll the bottom bearing liners into
place. Make certain the positioning lugs on the liners are correctly
seated in the bearing housing locating grooves.
8. Place the top bearing liners on the shaft journals and pasition oil
rings in the slots in the top liners.
9. Replace the bearing caps, making sure that the positioning lugs on
the top liners engage the grooves in the bearing caps. Insert the
dowel pins and tighten all bolts.

ITui continued onpage 3m.1