Why is air filtration important for gas turbine intake air?

• A. To increase air density at altitude.
• B. To remove dust and debris that cause compressor fouling, erosion, and performance loss.
• C. To cool the incoming air before compression.
• D. To humidify the intake air for better combustion.

Answer: (B)

Keeping intake air clean is essential to protect the compressor and preserve performance. Dust and debris in the air can abrade and erode compressor blades and create deposits that foul the intake and compression stages. This damage increases pressure drop, reduces mass flow and overall efficiency, and can drive higher maintenance costs or even lead to unexpected outages. By removing these contaminants before they reach the compressor, filtration helps maintain compressor efficiency, blade life, and reliable operation.

The other ideas don’t fit because filtration doesn’t purposefully change air density, nor does it cool the air before compression or humidify it. Cooling and humidification are handled by separate systems, while density changes with altitude are a function of pressure and temperature, not filtration.