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SC Plumber Contractor Practice Questions - South Carolina Plumber Contractor Examination Exam

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A natural-gas isometric serves an 80,000 Btu/h water heater and a 100,000 Btu/h furnace on a common 60-foot longest length (1,000 Btu/cf). Table 402.4(2) at 60 feet lists 3/4 inch = 137 cfh and 1 inch = 259 cfh. What is the minimum size of the common pipe that carries both loads?
Correct Answer:
1 inch

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