NM Mechanical Inspector Practice Questions - New Mexico CID Mechanical Inspector Examination Exam

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A natural-gas system is sized from UMC tables for schedule 40 metallic pipe, inlet pressure less than 2 psi, 0.5 inch water-column drop, and specific gravity 0.60. The longest developed length is 60 feet. Total connected load is 120 cubic feet per hour. Table capacities at 60 feet are: 1/2 inch = 65 CFH, 3/4 inch = 137 CFH, 1 inch = 257 CFH. What is the smallest pipe the inspector may approve for a section carrying the full 120 CFH?

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

Correct Answer:

3/4 inch

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