Vertical fire-tube boiler
Steam boiler powered by vertical fire tubes / From Wikipedia, the free encyclopedia
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A vertical fire-tube boiler or vertical multitubular boiler is a vertical boiler where the heating surface is composed of multiple small fire-tubes, arranged vertically.[1]
These boilers were not common, owing to drawbacks with excessive wear in service. The more common form of vertical boiler,[2] which was very similar in external appearance, instead used a single flue and water-filled cross-tubes. Another form used horizontal fire-tubes, even where this added complexity, such as the Cochran boiler.
Where a sustained high evaporative capacity (i.e. power) was required, vertical tubes were used, but rarely. These cases were mostly for locomotives, either railway locomotives or road steam wagons.