In a bottom-supported boiler, how is the steam drum typically supported?

In a bottom-supported boiler, the steam drum is typically supported by the water tubes. This design allows for a compact arrangement where the weight of the steam drum is directly transmitted to the water tubes that connect the drum to the boiler's furnace or lower sections. This setup helps maintain stability and minimizes stress on the structure, as the tubes are designed to handle both pressure and weight loads effectively. Additionally, the support from the water tubes ensures a close relationship between the steam drum and the generating area, which can enhance the efficiency of heat transfer and steam generation.

Typically, other support structures like overhead girders, piers, or placing the drum along the center line are not common for this type of boiler configuration due to the complexity and potential added costs involved. The design aims to streamline construction and operational efficiency, emphasizing how integral the water tubes are in providing necessary support for the steam drum.