The "D" type boiler is constructed with _____ drums.

The "D" type boiler is constructed with two drums. This configuration typically includes a large steam drum at the top and a smaller water drum at the bottom. The design allows for efficient heat transfer and steam generation by utilizing the natural circulation of water within the system.

In this type of boiler, the steam drum collects steam generated from the heated water, while the water drum helps manage the flow of water and steam within the boiler. The two-drum design promotes effective separation of steam and water, which is crucial for maintaining the operational efficiency and safety of the boiler.

The two-drum construction is also advantageous because it can accommodate higher pressures and temperatures compared to single-drum designs, making it suitable for various industrial applications. This configuration enhances the boiler's ability to produce steam quickly and manage fluctuations in load demand, which is vital for many power generation processes.