Discussion
Scale is dangerous in a boiler chiefly because it
Answer: A
Correct answer: insulates the tube and causes overheating
Scale has a thermal conductivity a small fraction of that of steel, so heat from the furnace cannot pass into the water. The tube metal beneath it rises in temperature until it loses strength and bulges or bursts under the internal pressure. Even a thin layer costs fuel; a thick one is a failure waiting to happen.
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