Page 460 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Steam Turbines and Turboapanders 437

4. After removing the split-ring spacer, reinsert the screws to remove
the compressor inlet transition piece. The screws usually serve as
jack screws. Remove any O-rings not previously removed.
5. Remove any screws attaching impeller follower (181) to other
parts. Remove impeller follower (1 8 1). Threaded holes are usually
provided for jack screws to aid removal. Remove shims which axi-
ally locate (181) relative to the impeller vanes.
6. Compressor inlet diffuser (not shown) may be removed by remov-
ing appropriate screws. Two threaded holes are usually provided
for jack screws.
7. Remove retaining screw (179), retaining washer (180), and com-
pressor impeller (170) from shaft (126). The impeller usually has a
threaded hole provided for a jack screw. Do not use the wrong tools
to remove this wheel. Remove keys (421).
8. Steadying bearing housing (147) with a hoist, remove screws (423)
and slide compressor case (188) away from housing, taking care not
to strike compressor case against shaft (126) or the back impeller
seal (1 85). The temporary use of two long threaded rods placed on
opposite sides of bearing housing in compressor case will aid in this
step. Remove O-ring (430).

Rotating Assembly

1. Steadying unit with a hoist, remove screws (440) which secure
bearing housing (147) to expander case (61). The complete rotating
assembly may now be withdrawn. Care must be exercised not to
strike expander rotor (107) while withdrawing assembly. The tem-
porary use of two long threaded rods placed on opposite sides of the
bearing housing in expander case will aid in this step, also. Remove
seals (966).
2. The entire rotating assembly should now be taken to a clean loca-
tion for disassembly. The unit should be positioned horizontally on
a workbench for ease in removal of components. Care must be
taken not to mar back impeller seal (185) or sh..

Expander Rotor and Heat Barrler Wall

1. Carefully remove expander rotor (1 07) by removing retaining
screw (1 1 8), and retaining washer (1 19). Remove rotor (107) utiliz-
ing the threaded hole provided for pulling purposes. Use jack screw
only to remove wheel. Remove keys (464). When reinstalling the
rotor, the required torque for retaining screw (1 18) must be ob-
served.