What is a benefit of corrugated furnaces in boilers?

The benefit of corrugated furnaces in boilers is that they allow for expansion and contraction while reducing stress on the structure. This is important because as the furnace heats up, the materials expand, and when it cools down, they contract. Corrugated designs provide flexibility, allowing these movements to happen without causing damage or excessive wear. The corrugation adds strength to the furnace, which helps it withstand the stresses of thermal cycling better than a plain furnace, minimizing the risk of cracking or failure. This structural advantage is crucial for maintaining the longevity and reliability of the boiler system.

In contrast, other options do not effectively capture the primary benefit of corrugated furnaces. For instance, while it might seem that fewer stays or a lower cost could be appealing, the main advantage of corrugated furnaces is their ability to handle thermal expansion and contraction efficiently. Additionally, the use of rolled copper is not typically a characteristic of corrugated furnaces; instead, they're more commonly made from other materials suitable for high-temperature applications.