Observing a visible sheen on the water surface indicates which category?

• A. GT running leakage
• B. GT seepage
• C. Weepage
• D. Zero leakage

Answer: (C)

A small, persistent release of hydrocarbons into the water creates a thin film or sheen on the surface. This is the hallmark of a weepage leak—fuel or oil slowly oozing through seals, fittings, or tank penetrations and making its way into the water. The sheen indicates that leakage is present, even if the rate is low, which is why this category fits best. If the turbine were actively leaking during operation, you’d expect more obvious evidence like dripping or spraying, not just a surface film. Zero leakage would show no film at all, and GT seepage implies a different leakage behavior that doesn’t necessarily produce a surface sheen on the water.