Hot Gas Path Inspection — Inspection ProceduresInspection and Maintenance — GEK 107048
HGP-I-1
II. Inspection Procedures (Hot Gas Path Inspection)
For MS-6001B DLN-1 Equipped Machines
Operation 1 — Perform Combustion Inspection Procedure Operations Number 1 Through
Number 15 and Operations Numbers 17 and 18
Note: Refer to the Combustion Inspection section of this Service Manual for
inspection procedures for the following operations.
1. Pressure test fuel oil check valves.
2. Fuel nozzle inspection.
3. Inspect combustion liners.
4. Inspect crossfire tubes and retainers.
5. Inspect transition pieces.
6. Inspect forward and aft flow sleeves.
7. Inspect combustion outer casings.
8. Inspect and test spark plugs.
9. Inspect and test flame detectors.
Operation 2 — How to Inspect First, Second and Third Stage Nozzles
Note: The first stage nozzle may become available for partial or complete in-
spection at less than hot gas path inspection intervals because of other
inspection or maintenance requirements. It is important that these in-
spection results be accurately interpreted, evaluated, and recorded to
minimize operator’s maintenance expense while providing high reli-
ability.
Extreme care must be exercised when grit blasting nozzle segments so
no grit will enter the nozzle partition cooling holes. Using an air pres-
sure of 40 psig or less work the blasting nozzle in the direction of normal
hot gas flow path across the nozzle partition. Normal hot gas path flow
is leading edge to trailing edge. Do not dwell in one area as excessive
amounts of metal may be removed.
1. Clean nozzles by blasting with aluminum oxide 220 grit or finer. Air blast nozzles to assure remov-
al of all blasting grit from surfaces and openings. Fluorescent penetrant (Zyglo) check the nozzle
(including the second and third stage nozzle segments hook fits). Inspect for foreign object dam-
age, erosion, corrosion, and cracks. Refer to the Standard Practices section of this Service Manual
for Gas Turbine Cleaning Procedures.
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