Gas turbine hot gas path parts: functions, wear and sourcing
Understand the roles of combustion liners, transition pieces, nozzles, blades and shrouds without guessing interchangeability.
Hot gas path components see the highest temperatures and the most aggressive operating conditions in a gas turbine. They are also the parts most often replaced during inspections. Understanding what each component does makes sourcing and inspection decisions safer.
Combustion liners
The liner contains the flame and shapes the combustion process. It is exposed to high temperature, thermal cycling and pressure pulsation. Cracks, oxidation, distortion and hot spots are common. When sourcing a liner, verify the cooling configuration, fuel nozzle interface and any repair history.
Transition pieces
The transition piece carries hot gas from the combustor to the turbine inlet. It must seal against the liner and the first-stage nozzle while accommodating thermal growth. Wear at seals, cracks and distortion are key inspection points.
Turbine nozzles and blades
- Nozzles accelerate and direct hot gas into the first rotating stage.
- Blades extract work from the gas stream and are sensitive to cooling-path condition.
- Buckets and blades should be checked for creep, coating loss, tip clearance and root damage.
- Nozzle and blade part numbers often carry configuration suffixes that must match the unit.
Shrouds and seals
Shrouds control tip clearance and protect the casing. Seal segments limit leakage between stages. Clearance loss and seal wear directly affect efficiency, so these parts should be assessed together with blades and nozzles.
What to verify before sourcing
- Exact part number and dash-number suffix.
- Unit frame or model and serial number.
- Whether the part is new, refurbished or serviceable as-removed.
- Required documentation and inspection scope.
- Interchangeability across revisions — never assume.
Frequently asked questions
What is the hot gas path?
The hot gas path is the route combustion gas takes from the combustor through the turbine nozzles, blades and shrouds. These parts face the highest temperatures and stresses.
Which hot gas path parts wear fastest?
Combustion liners, transition pieces, first-stage nozzles, blades and shrouds typically experience the highest thermal load and wear.
Can AGO Aviation supply hot gas path parts by part number?
Yes. Send the part number, unit model and required condition, and we will verify availability and compatibility before quoting.
Need help with a part?
Send your part number and we will verify availability.
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