Where does steam primarily form and separate from water in a water-tube boiler?

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In a water-tube boiler, the steam-water mixture is separated and steam is gathered where the steam drum sits at the top of the system. As water is heated in the tubes, bubbles rise into the steam drum, and this drum provides space and flow for the vapor to separate from the liquid so the steam can be drawn off cleanly. The mud drum at the bottom collects sediment and isn’t where steam separation happens. The economizer is a heat exchanger that preheats feedwater to improve efficiency, and the superheater comes after separation to heat the steam further. So, the primary formation and separation of steam occur in the steam drum.