Page 461 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

438 Major Process Equipment Maintenance and Repair

2. Remove exposed screws and dust free seal from heat barrier wall
assembly (102). Threaded holes are usually provided for jack
screws in the dust free seal.
3. Remove screws and washers and heat barrier wall (102). Again,
two threaded holes are usually provided for jack screws.
4. Remove front oil retainer and O-rings which will be accessible after
the heat barrier has been removed. "bo threaded holes are provided
for jack screws.

Back and Front Journal Bearlng

1. Remove accessible screws and back impeller seal (185). Remove
exposed screws to remove compressor seal and seal O-rings. Two
threaded holes are usually provided for jack screws in both the back
compressor seal and back impeller seal.
2. Remove back oil retainer and associated O-ring. Again, two
threaded holes are provided for jack screws.
3. Break exposed lockwires and remove screws and washers. Using
the two threaded holes provided for jack screws, remove back
grooving bearing (138). Remove O-ring associated with part (138).
4. Withdraw shaft (126), together with back and front bearing thrust
washers and pins (127). Exercise care to keep shaft centered in or-
der to avoid damaging the journal bearing. Do not drop either
thrust washer.
5. Break exposed lockwires and remove screws and washers. Remove
front grooving bearing (137). Two threaded holes are provided for
jack screws. Remove O-ring.

Nozzle Actuator Assembly

Refer to the manufacturer's nozzle actuator assembly drawing.
1. Remove locking nut for air motor while there is still about 6 psi of
signal pressure applied. This is to relieve the spring pressure for
easy removal of locking nut. After its removal, disconnect all in-
strument air lines. Remove self-locking pin in actuator rod, making
certain there is no burr in pin hole.
2. To remove bonnet assembly, loosen gland follower and remove
screws at base of assembly. To remove upper section of actuator
rod, lift assembly and remove jam nut normally supplied with this
assembly.