NM CID MM-2 Practice Questions - New Mexico CID MM-2 Natural Gas Fitting Examination Exam

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A system has a 100,000 Btu/h furnace, a 40,000 Btu/h water heater, and a 35,000 Btu/h range on 1,000 Btu/cf gas. Longest length is 50 feet. The 50-foot row of the table used on the exam lists: 1/2 inch = 73 CFH, 3/4 inch = 152 CFH, 1 inch = 286 CFH. What is the smallest main that can carry the entire connected load?

1/2 inch 3/4 inch 1 inch 2 inch

Correct Answer:

1 inch

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