New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

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What is the outer diameter of 1 inch type K tube (25mm)?

1.0
1.125
1.25
1.5

The correct answer is: 1.125

The outer diameter of a 1-inch Type K copper tube is indeed 1.125 inches. This specific measurement is standard for this type of tubing, which is used in various plumbing and HVAC applications due to its thicker walls compared to other types of copper tubing, like Type L or Type M. The wall thickness of Type K tubing allows it to handle higher pressures and temperatures, making it suitable for a range of installations including residential and industrial applications. Understanding the dimensions of different types of pipes and tubing is crucial for pipe fitters, as using the correct size affects fittings, flow rates, and overall system performance. Knowing that 1-inch Type K tubing has an outer diameter of 1.125 inches is essential for ensuring compatibility with connectors, valves, and other plumbing elements.