Firetube Boilers - National Board of Boiler and Pressure ...
The top tube sheet in a steam boiler can be above or below the water line. When it is above, it is called a dry-top and when it is below, it is called a wet-top. ... is used to fire the boiler or, if the furnace design can provide enough heat to damage the boiler after the fuel supply is stopped, the two feedwater methods must be independent so ...
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