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steam drum
A steam drum is a standard feature of a water-tube boiler. It is a reservoir of water/steam at the top end of the water tubes. The drum stores the steam generated in the water tubes and acts as a phase-separator for the steam/water mixture. The difference in densities between hot and cold water helps in the accumulation of the "hotter"-water/and saturated-steam into the steam-drum.
== History ==
Initially the boilers were designed with 4 drums and 3 drums like the Stirling boiler. The single drum at the bottom and three drums on the top were connected through a network of tubes which were welded to the drums above and the single drum below. The rational demand of steam in terms of capacity, pressure and temperature resulted in bi drums and single drum boilers.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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