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Hot Gas Path Inspection — Disassembly Procedures
Use the disassembly procedure applicable to your units configuration.
See Figure HGP-D.12.
1. Remove the horizontal joint bolting and clamps from first stage nozzle. Do not remove the joint
dowels. Identify horizontal clamp for left and right side.
2. Carefully lift the top half of the first stage nozzle using a chain fall. Pay special attention to the
support pad seal between nozzle and support ring. The support pad seals must slide out of the
inner support ring. See Figure HGP-D.12.
3. Clean the support pad seal area, and check for and remove any burrs on edges of support pad seal
grooves and tongues.
4. Set the nozzle flat on a piece of plywood or equivalent to protect it from damage.
Operation 12 — How to Remove Upper Half First Stage Nozzle (With Tangential Support Pin)
1. Remove horizontal joint bolting and clamps from first-stage nozzle.
2. Remove the tangential support pin bolts and retainer plates. Discard bolts and retainer plates.
3. Remove the support pins by breaking the contact between the pin and bushing with a wrench and
withdrawing the pins by means of the threaded extraction hole in the center of the support pin.
4. Rig to lift the upper half nozzle using a chainfall attached to the lifting angles on the nozzle. Care-
fully lift the upper half nozzle clear of the unit and set the nozzle flat on a piece of plywood of
equivalent to protect it from damage. See Figure HGP-D.12.
Operation 13 — How to Remove Lower Half First Stage Nozzle Eccentric Pin
1. Unbolt the eccentric pin retaining strap from the turbine casing and remove the lower half first
stage nozzle eccentric pin. Stamp the pin to identify it.
Operation 14 — How to Remove Lower Half First Stage Nozzle (With Support Pad and
Retainers)
Note: Prior to rolling out the nozzle, remove the horizontal support blocks
from the left and right side.
Identify the support blocks for left and right side location. These blocks
are ground at the factory to obtain proper clearances on the nozzle at
assembly.
1. Roll out the lower half nozzle by attaching one end of it to a hook with a straight cable and attach-
ing the other end to a one ton "come-along" or chainfall. By alternately raising on the cable and
lowering on the chain fall, the retaining ring and nozzle can be rotated 90 .
2. Reattach the chain hoist to pickup the nozzle at its vertical centerline. Continue the "roll-out" pro-
cess until the lower half nozzle can be lifted clear of the turbine.
3. Set the nozzle flat on a piece of plywood or equivalent and protect same from damage.
HGP-D-20
Inspection and Maintenance — GEK 107048
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