Operational Flexibility for IGT25 Gas Turbine

What it offers

The IGT25-FC has been designed for a wide range of operating modes including steady state and transient conditions. The changes focus on engine operation, control system, component mechanical integrity and combustion system improvements. It is an upgrade of IGT25 to push the operation envelope and to follow what the market demands that are emission control and improvement in reliability and availability. The numbers for reliability and availability are 99.5% and 95% respectively while average time between overhauls remains the same as the IGT25.

The turn down capability of this engine extends low emission operation to even lower load levels, enabling reduced fuel consumption and lower total emissions at minimum loads. Economic-wise, this translates into an improved condition, by remaining online during off-peak periods to decrease shutdown and startup cost. Also, the fast start capability (the ability to start and stop in short cycles) enables the engine to respond to a sudden demand.


Make the most out of the engine!

Increase in Production
Higher Efficiency
Environmentally Friendly
Reliability and Availability
Life Extension

What You Gain

Technical Specifications

Reliability 99.5%
Availability 95%
+ Startup time ~ 10min
+ GT turndown ~ 50%


  • Inlet Guide vane modification
  • Control logic optimization


  •  Variable Nozzle guide vane
  • Control logic optimization

Combustion Chamber

  • Adding the bypass system
  • Burner & ignition system modification


A glimpse into the new design

IGT25-FC has been designed to offer a higher flexibility without risking maintenance plan and expected downtime. The package includes the following:

Low load turn down design by:

    • Bypassing additional cooling air around the combustor

Reliability and Availability improvement by:

    • Maintenance plan optimization
    • Elimination of unnecessary trip signal
    • Implementation of auxiliary-system redundancy
    • Control, auxiliary and accessories improvement

An increase in starting reliability by:

    • Ignition system modification
    • Control logic upgrade

Fast start option by:

    • Moving “purge” to shut-down
    • Control logic modification
    • Increasing acceleration and load rate
    • Bypassing compressor air flow by compressor bleed valve
    • Adjustment of Primary Fuel Ratio (PFR) of the combustor based operating condition

Cool down time decrease by:

    • Forced Cool down instead of normal cool down
    • Changing the barring speed to enable the generator rotor wedges to lock up

Trip factor reduction by:

    • Optimizing the trip scenarios
    • Optimizing the trip effectiveness factor in logic control system