Question 388Steam Plants - 1st Asst/Chief

The correct answer is B) causes pitting of the gear teeth. Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it can cause pitting of the gear teeth. Water in the oil can lead to corrosion and erosion of the gear surfaces, leading to accelerated wear and eventual failure of the gears. This is a well-known issue in the operation and maintenance of turbine-driven propulsion systems, as water contamination of the lubricating oil can significantly impact the reliability and lifespan of critical components. The other answer choices are incorrect because: A) water in the oil does not cause the turbine to overspeed, C) water does not raise the flash point of the oil, and D) water in the oil would not result in excessive cooling of bearing surfaces.