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A high pressure watertube boiler [1] (also spelled water-tube and water tube) is a type of boiler in which water circulates in tubes heated externally by fire. Fuel is burned inside the furnace , creating hot gas which boils water in the steam-generating tubes.
Early use of the water-tube boiler within the Royal Navy was controversial at times, giving rise to the 'Battle of the Boilers' around 1900. [4] These first boilers, such as the Belleville and Niclausse, were large-tube designs, with simple straight tubes of around 4" diameter, at a shallow angle to the horizontal. [5]
A fuel explosion within the confines of the firebox may damage the pressurized boiler tubes and interior shell, potentially triggering structural failure, steam or water leakage, and/or a secondary boiler shell failure and steam explosion. A common form of minor firebox "explosion" is known as "drumming" and can occur with any type of fuel.
The internally rifled (also known as ribbed) tubes are used in boilers and heat exchangers to improve the efficiency of heat transfer. The rifling imparts a centrifugal force to the flowing fluid (commonly a mixture of steam and water). This separates water from the mixture, forces the water towards the wall, and prevents formation of a steam ...
three-drum boiler: water-tube boilers with three drums in a triangular arrangement. The best known of these are the Yarrow and Admiralty patterns. Lesser-known examples are the Normand and Mumford. Thornycroft boiler: Several variants of an early naval water-tube boiler. [6] [9] [59] Also a small annular water-tube boiler used in Thornycroft's ...
The move to water-tube boilers had already begun, with designs such as the Babcock & Wilcox or the Belleville. The three-drum arrangement was lighter and more compact for the same power. [1] The new generation of "small-tube" water-tube boilers used water-tubes of around 2 inches (5 cm) diameter, compared to older designs of 3 or 4 inches.
Fire-tube boilers usually have a comparatively low rate of steam production, but high steam storage capacity. Fire-tube boilers mostly burn solid fuels, but are readily adaptable to those of the liquid or gas variety. Fire-tube boilers may also be referred to as "scotch-marine" or "marine" type boilers. [7] Diagram of a water-tube boiler.
A tube damaged by caustic embrittlement. White caustic deposits can be seen inside. As water evaporates in the boiler, the concentration of sodium carbonate increases in the boiler. In high pressure boilers, sodium carbonate is used in softening of water by
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