The term “once-through boiler” refers to a special type of water-tube boiler composed of
tubes, in which water is input at the bottom, and steam is produced from the top.
This panel shows a typical structure for such a boiler, comprising a drum, burner, pumps and
other accessories, and a control section. Since the drum is composed of tubes, there is little
water in the drum, and the boiler thus offers little risk of damaging the surrounding area in the
unlikely event of a rupture. (เพิ่มเติม…)