Page 415 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Steam Turbines and Ticrboeqanders 393

Note: Record the number of turns required to remove the adjusting
nut (4) so it can be returned to its original setting during as-
sembly.

4. Rotate the rotor shaft 180” and remove the “U” lock staple sur-
rounding the weighted end of the trip pin (1).
5. Remove the trip pin from the trip body. (Remove the auxiliary
weight (6), if furnished.)

Rip Body Removal
1. Remove the rotor assembly from the turbine casing.
2. Remove the set screw from the trip body (52, Figure 8-5).
3. Heat the trip body evenly with a torch. Apply heat as rapidly as
possible, then pull the trip body from the rotor shaft.
Caution: Care must be exercised to prevent heating the rotor locat-
ing bearing and the rotor shaft when heating the trip body.
Protect both by wrapping in asbestos cloth.
Plunger Assembly Replacement

The plunger assembly (7, Figure 8-12) can be removed by lifting it out
of the bearing housing while the rotor assembly is out of the turbine cas-
ing. (Except turbines equipped with bearing cases having a flanged gov-
ernor fit such as PG, UG and 0 Governors.) ”hbines equipped with PG,
UG and 0 Governors employ an “Umbrella” plunger. A retainer ring,
washer and spring arrangement must be removed from the bottom of the
“Umbrella” plunger before lifting it from the bearing housing.
If necessary, worn plunger assemblies can be replaced without remov-
ing the rotor assembly. (See applicable details for “Umbrella” plunger
removal, later.) To remove the plunger assembly shown in Figure 8-12:

1. Remove the steam end bearing cap.
2. Remove the governor and adapter piece from the steam end bearing
housing.
3. Loosen the jam nut (10, Figure 8-12) and remove set screw (11) from
the side of the bearing housing.
4. Remove the set screw from the plunger assembly and separate the
two halves of the plunger to remove them from the bearing housing.
5. Assemble in reverse order.

Note: When replacing the plunger assembly in this manner, both
parts of the new plunger assembly must be installed.