Question 170Motor Plants - 1st Asst/Chief
70% to passDowncomers installed on auxiliary package boilers are protected from direct contact with hot gases by _______________.
Asteel baffles
Brefractory and insulation
Cwater wall tubes
Dseveral rows of screen tubes
AI Explanation
The correct answer is B) refractory and insulation. Downcomers on auxiliary package boilers are protected from direct contact with hot gases by a layer of refractory material and insulation. This insulation and refractory lining helps prevent the hot combustion gases from directly impinging on the downcomers, which could potentially damage them. The other answer choices, such as steel baffles, water wall tubes, or screen tubes, are not the primary means of protecting the downcomers from the hot gases in this type of boiler system.
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