Combined Cycle Journal

Page | 092

ALSTOM OWNERS GROUP
September 21st–25th September 21st–25th
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2025 Combustion Turbine 2025 Combustion Turbine
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For more, see the review of HRSG Forum
2024 in Combined Cycle Journal, Number
82.
He then focused on a D11 case history.
A unique feature shown at AOG 2024 was
Arnold’s Step Protection system that pro-
vides solid ground above the insulation and
protects the insulation during inspection
and maintenance (Fig 13).
Key steam turbine warming takeaways in-
cluded:
„ Reduced startup time by up to 75 percent.
„ Reduced parasitic load.
„ Less stress on CT hot-gas-path/exhaust
area.
He then mentioned HRSG warming op-
tions and a downcomer project involving
both Duke Energy and EPRI.
GT HEALTH
Dan Stankiewicz, Liburdi Turbine Services,
discussed Gas turbine health management
and advanced analysis techniques to both
optimize service intervals and detect abnor-
mal conditions.
He introduced the Liburdi gas turbine
analysis program (GTAP), a physics-based
engine model for full-gas-path aero/thermal
analysis and calculations of both power and
efficiency loss.
His examples were quite specific covering
hot section measurement, compressor map,
92
and stage-by-stage operating conditions.
This leads to FE analysis to calculate met-
al temperatures and modeling of critical
components (e.g. turbine flows at each crit-
ical row, among others). Creep strains and
deformations during operation can also be
calculated.
He went on to discuss oxidation and coat-
13. Arnold’s unique step protection system
COMBINED CYCLE JOURNAL, Number 82 (2025)