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Inspection and Maintenance — GEK 107048
Operation 6 — How to Remove Turbine Casing Bolts and Upper Half First Stage Nozzle
Eccentric Pin
1. Unbolt the upper half circumferential bolting between the turbine casing and exhaust hood.
2. Unbolt the upper half circumferential bolting between the turbine casing and the compressor dis-
charge casing.
3. Remove the horizontal joint bolting and body-bound bolting. (Horizontal bodybound bolts are
removed by driving them upward.)
4. Mark body bound bolts for replacement in same holes.
5. Remove upper half eccentric pin near the top vertical centerline of the turbine casing. Stamp the
pin to identify it as the top eccentric pin.
Operation 7 — How to Remove Upper Half Turbine Casing (See Figure HGP-D.3)
Note: The lifting beam, trolley hoist and spreader bar are applicable to verti-
cal exhaust stack configurations only. For side exhaust stack configura-
tions use overhead crane and normal rigging.
1. Procure the turbine casing lifting beam and trolley hoist. Install the stops on the forward end of
the lift beam and install the trolley hoist. Clamp the trolley hoist in the forward most position on
the lift beam and in stall the aft stops.
2. Rig to lift the beam-hoist assembly with an overhead crane. Lift the beam-hoist and guide it into
the forward opening of the exhaust duct transition piece as far as the rigging will allow.
3. Using a chainfall or comealong mounted in the transition piece, slide and guide the lift beam into
the mounting slot(s) bolt the lift beam at the slot(s) and at the plate on the beam to the transition
piece.
4. Remove the rigging and release the clamp on the trolley hoist.
5. Attach the spreader bar to the trolley hoist hook and position the trolley over the turbine casing.
6. Lubricate and install guide pins and jackbolts. Refer to Standard Practices, Special Tools section,
in this Service Manual.
7. All guide pins are used in the body bound bolt hole provisions. See Figure HGP-D.4.
Note: Tapped holes (1.75 in.-eight thread) for jacking the turbine casing
apart are provided at four locations in the upper and lower halves of
the turbine casing horizontal joint bolting flange. These are located as
follows on each side of the turbine casing:
a. First hole aft of the forward vertical flange.
b. Fifth hole forward of the aft vertical flange.
Hot Gas Path Inspection — Disassembly Procedures
HGP-D-7
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