SC Heating Practice Questions - South Carolina Heating Contractor Examination Exam

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Using the Low Pressure Boilers heating-surface rule (two-thirds of the tube circumference for a fire-tube boiler), what is the heating surface of a fire-tube boiler with 50 tubes, each 3 inches in diameter and 16 feet long? Use π = 3.14.
Correct Answer:
419 square feet

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