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

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A low-pressure natural-gas system is sized from a UMC schedule 40 metallic-pipe table (inlet less than 2 psi, 0.5 inch water-column drop, specific gravity 0.60). Longest developed length is 60 feet. Total connected load is 120 CFH. The 60-foot row of the table used on the exam lists: 1/2 inch = 65 CFH, 3/4 inch = 137 CFH, 1 inch = 257 CFH. What is the smallest pipe that may carry the full 120 CFH main load?

1/2 inch 2 inch, because every main must be at least 2 inch 1 inch is the minimum that can carry 120 CFH 3/4 inch

Correct Answer:

3/4 inch

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