Which stages of the compressor stator have 3 bleed air manifolds welded into the casing?

The stages of the compressor stator that feature 3 bleed air manifolds welded into the casing are located in the 8th, 9th, 13th, and 16th stages. This design is crucial for managing airflow and pressure within the gas turbine engine. The use of bleed air allows for better control during different operating conditions, such as starting, shutdown, or when the engine experiences transient conditions.

In particular, the bleed air systems help to alleviate compressor surge, improve stability, and optimize overall engine performance. By ensuring that bleed air is sourced from these specific stages, the engine can maintain efficiency and respond appropriately during various phases of operation.

The incorrect options do not have the specific combination of stages with this configuration, which is important for the efficient functioning of the gas turbine's compressor. Understanding which stages are equipped with bleed air manifolds is integral to comprehending the operational capabilities and performance enhancements of gas turbine systems.