What is the disadvantage of the abrasive grit process?

• A. The agent does not clean the turbine vanes and blades as effectively as the fluid wash
• B. It damages the turbine casing
• C. It causes excessive vibration
• D. It voids the warranty

Answer: (A)

Abrasive grit blasting relies on fast-moving particles to knock deposits off metal. For turbine vanes and blades, you want a surface that’s as clean as possible and smooth enough to maintain aerodynamic performance. The grit method often roughens the surface and can leave particles or residues in tiny crevices, so some deposits remain and the overall cleanliness isn’t as thorough as with fluid wash. Fluid wash uses detergents and solvents with high-flow that dissolve and flush away contaminants, reaching into crevices without roughening the surface, giving better cleaning of blades and vanes. That’s why the abrasive process is viewed as a disadvantage in this context. The other options aren’t inherent drawbacks of abrasive grit blasting when used properly.