What term describes the tubes located in the firebox that transfer water from the steam drum to the mud drum?
A) Risers
B) Downcomers
C) Superheater
D) Desuperheater
Answer: B
Explanation: A) Incorrect. Risers are tubes that go into the side or top of the steam drum and allow heated water and steam to flow up from the mud drum.
B) Correct. Downcomers are tubes located in the firebox that transfer water from the steam drum to the mud drum.
C) Incorrect. The superheater is a set of tubes, located near the boiler outlet, which increase (superheat)the temperature of the steam.
D) Incorrect. A desuperheater is a system designed to control the temperature of steam leaving a boiler by using water injection through a control valve.
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