Water washing the Gas Turbine Compressor (GTC) removes impurities from which part of the Gas Turbine Engine (GTE)?

• A. Turbine section
• B. Combustion chamber
• C. Compressor sections
• D. Oil system

Answer: (C)

Water washing targets the compressor sections because deposits that build up on the compressor blades and vanes during operation reduce smooth airflow and efficiency. By flushing a controlled stream of water (often with detergent) through the compressor, these deposits are dissolved and flushed away, restoring smooth blade surfaces, improving airflow, and recovering pressure ratio and surge margin. The turbine and combustion chamber aren’t cleaned with this method, since they operate at much higher temperatures and require different cleaning approaches. The oil system is cleaned separately through filters and oil changes, not by water washing.