Master Plumber Practice Exam 2026 – Complete Prep Guide

The maximum cubic feet per hour of gas flow through a tube can be determined by several factors, including the size of the tube, the type of gas being used, and the inlet pressure. In this case, a 5/8-inch O.D. ACR tube is being evaluated under specific inlet pressure conditions.

For a 5/8-inch ACR tube, industry standards and flow charts provide specific flow rates that can be expected under various pressures. The flow rate is influenced by the diameter of the tubing and the pressure drop over the length of the run, with larger diameters generally allowing for greater flow rates.

The answer “27” cubic feet per hour is aligned with the maximum flow capacity typically indicated for a 5/8-inch ACR tube under standard conditions, suggesting that under the specific inlet pressure mentioned, this rate is indeed the highest expected before efficiency or safety issues could arise.

Understanding these flow capacities is vital for ensuring proper gas distribution without risking overpressure or safety hazards, so knowledge of the maximum gas flow through specific tubing dimensions is essential for effective plumbing practice.