Which of the following is the hot water line in a water tube boiler?
A. Riser tube
B. Radiant tube
C. Downcomer tube
D. Superheated tube
A. Correct. The riser tube is the hot water line between the lower and upper drums.
B. Incorrect. Radiant tubes contain boiler feedwater that is heated by radiant heat from the burners.
C. Incorrect. The downcomer tube is the cold water line between the upper and lower drums.
D. Incorrect. Superheated tubes are tubes where steam is removed from the steam drum and heated without an increase in pressure.
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