In the marine gas turbine engine shown in the illustration, the 9th stage bleed air is used for __________. Illustration GT-0017

Correct Answer: Option D — power turbine cooling

Ninth-stage compressor bleed air is specifically routed to the power turbine section for cooling purposes. By utilizing intermediate-stage air, the system maintains the power turbine components within their metallurgical temperature limits, ensuring long-term durability and preventing thermal degradation of the turbine blades and disks during sustained high-power operations.