Page 398 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

376 Major Process Equipment Maintenance and Repair

Packlng Case Assembly, Small Turbines
1. Clean packing case flange surfaces and mating turbine casing sur-
faces.
2. Blow out the packing cases with high pressure air.
3. press 1/8 in. (3 mm) maximum diameter plastic string mmpod
into the grooves provided in the packing case vertical flange faces.
Cut the string to prevent it from extending beyond the horizontal
flange.
4. Apply a thin coat of paste sealing compound to the horizontal flanges
and inside bolt circles of the vertical flange faces (Refer to Figure 8-8).

Note: Excessive paste sealant on packing case flanges may result
in sealant entering the packing cases and adhering to carbon
rings. This may prevent the carbon rings from seating prop-
erly. Keep paste sealant approximately 3/16 in. (5 mm) away
from inside edges of flanges to prevent it from squeezing
into carbon ring chambers.

5. Place top half packing cases in position and replace cap screws (7
and 8, Figure 8-5).
Note: 'hrn cap screws (7) on vertical flange until snug. Tighten
cap screws (8) on horizontal flange, then tighten cap screws
(7) on vertical flange.

lurblne Caslng

The turbine casing cover (3 and 64, Figure 8-5) must be lifted to in-
spect the rotor assembly, nozzle ring (33) or reversing blade assembly
(37).

Dlsessem bly

1. On small turbines, remove top half packing cases as outlined in Pack-
ing Case Disassembly. Remove only the vertical flange cap screws (7,
Figure 8-5) from the packing cases on larger turbines.
2. Remove bolts (4) and dowels (5) from the horizontal casing flange.
3. Carefully lift the casing cover by the eyebolt (60) until it clears the
rotor disks (44 and 45).
4. Remove the cover to a safe location. Thke care to protect the ma-
chined surfaces of the cover.