Where does the bottom blow down line of a high pressure water tube boiler connect?

The correct answer is that the bottom blow down line of a high-pressure water tube boiler connects to the mud drum. This connection is crucial for effective boiler maintenance and operation. The mud drum serves as a collection point for sediments, sludge, and other impurities that settle at the bottom of the boiler due to the water and steam generation process.

By connecting the bottom blow down line to the mud drum, operators can regularly remove these accumulations. This helps maintain water quality, ensures efficient heat transfer, and prevents corrosion and other issues that could arise from sediment build-up. Effective blow down operations are integral to prolonging the life of the boiler and ensuring its safe and efficient operation.

The other options, such as the boiler front, water tank, and steam drum, do not serve the same purpose as the mud drum in terms of sediment control and blow down functions. The steam drum primarily contains steam and is where steam separation takes place, while a water tank is not a component directly associated with the operation and maintenance of impurities in a boiler system.