Water tube boiler and their types

What is ment by water tube boiler?

           Water tube boiler is type of boiler in which water circulates in tubes heated externally by the fire.
           this boiler attains high-pressures, as well as high-steam capabilities, can be achieved. This is because of condensed tangential pressure on tubes which is known as hoop stress. The water tube boilers are mainly used for generating steam with high temperature as well as pressure.

Types of Water Tube Boilers:

1) Simple Vertical Boiler

2) Stirling Boiler
3) Babcock and Wilcox Boilers

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