Question 104Steam Plants - 1st Asst/Chief

The correct answer is D) Heated fresh water. The reason heated fresh water is the recommended medium for water washing a boiler is that it helps to effectively remove any built-up scale or deposits within the boiler. The heated temperature helps to dissolve and dislodge these materials, allowing them to be flushed out. Using cold water would be less effective, while salt water could potentially cause corrosion to the boiler's internal components over time. The other options, A) cold fresh water, B) cold salt water, and C) heated salt water, are not recommended as they would be less effective or potentially damaging to the boiler during the washing process.