A. Those parts of a boiler which are exposed on one side to only the water being heated and on the other side to the combustion gases, such as the economizer surfaces. B. Those parts of a boiler which are exposed on one side to only the steam being heated and on the other side to the combustion gases, such as the superheater surfaces. C. Those parts of a boiler which are exposed on one side to the water or steam being heated, and on the other side to the combustion gases. D. Those parts of a boiler which are exposed on one side to only the water being heated and on the other side being directly exposed to the furnace flame. « Previous Next »
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