Refrigeration & Air Conditioning USCG Question #1012 (Set 20)

Expansion tanks when used in a ship's low temperature hot water heating system may be of the open or closed type. Referring to the illustrated central-station hookup for a hot water heating system drawing, what would be the normal temperature range of the water? Illustration GS-0151

USCG Exam Illustration GS-0151
USCG Examination Diagram: Illustration GS-0151
Official USCG Answer & Rule Citation

Correct Answer: Option A — 180oF to 200oF

Marine low-temperature hot water heating systems typically operate within a standard temperature range of 180°F to 200°F. This range optimizes thermal comfort and heat exchanger efficiency while preventing boiling within pressurized closed-loop configurations.

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