Which type of boiler is commonly used for high-pressure applications?

• A. Fire-tube boiler
• B. Water-tube boiler
• C. Electric boiler
• D. Steam generator

Answer: (B)

Water-tube boilers are commonly used for high-pressure applications due to their design and operational characteristics. In a water-tube boiler, water circulates in tubes that are heated externally by combustion gases. This design allows for a larger surface area for heat transfer and enables the boiler to withstand higher pressures compared to fire-tube boilers, where water is contained in tubes surrounded by hot gases. The construction of water-tube boilers also allows them to operate efficiently at elevated temperatures while providing safety and reliability under high-pressure conditions.

Moreover, water-tube boilers can be made in various configurations for different applications, making them versatile for industrial and utility use where high steam capacity and pressure are required. They can accommodate rapid changes in demand, thanks to their ability to quickly respond to load changes.

In contrast, fire-tube boilers generally operate at lower pressures and are more suited for applications where high steam pressure is not a primary requirement. Electric boilers and steam generators are also utilized for specific functions but not typically in high-pressure scenarios as effectively as water-tube boilers.