Which type of deposits is the boiling out procedure for naval boilers used to remove?

The boiling out procedure for naval boilers is specifically designed to remove hard deposits. These deposits can form from the buildup of minerals and other contaminants that accumulate over time due to water used in the boiler. The boiling out process involves heating the water to create steam, which helps to loosen and dislodge these hard scale deposits from the internal surfaces of the boiler. This method allows for effective cleaning, ensuring that the boiler operates efficiently without the interference of stubborn debris.

The correct choice highlights the necessity of addressing hard deposits, as they can significantly impact boiler performance and efficiency if left untreated. Understanding the specific nature of these deposits is essential in maintaining the overall health of the boiler system and preventing potential failures or operational issues.