In the boiler shown in the illustration, the arrow "E" indicates a __________. SG-0008
Official USCG Answer & Rule Citation
Correct Answer: Option C — downcomer
Downcomers are unheated, large-diameter external or internal tubes connecting the steam drum to the lower headers, ensuring positive solid-water circulation down to the water drum under all operating conditions in accordance with 46 CFR Subchapter F boiler design criteria.
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