Gas Turbine Systems Technician – Mechanical (GSM) A School Test 4 Practice

What does the water wash inject through the water wash nozzle while monitoring the RIMSS?

Water or chemical cleaner Fuel Lubricating oil Air

Correct Answer:

Water or chemical cleaner

Explanation:

Water wash uses water or a chemical cleaner pumped through the wash nozzle to flush and dissolve deposits on the compressor blades and internal surfaces. The purpose is to restore clean airflow and improve performance, and the cleaning solution is chosen specifically for that purpose. Fuel, lubricating oil, or air would contaminate the wash and could cause damage or safety issues, which is why they’re not used in the wash stream. While the wash is happening, the RIMSS is monitored to ensure all parameters stay within safe limits, and the operation is stopped if any reading indicates a problem.

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