New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is the end to center measurement of a 45 degree long radius elbow?

1. 1/2

2. 5/8

3. 3/4

4. 7/8

The correct answer is: 5/8

The end to center measurement of a 45-degree long radius elbow is an important specification in piping design because it helps determine how much space the elbow will occupy in a piping system. For a 45-degree long radius elbow, the centerline radius is usually equal to 1.5 times the pipe diameter, and the end to center measurement can be derived from this radius. To calculate the end to center measurement, you start from the end of the elbow and measure to the centerline of the elbow. For a 45-degree long radius elbow, this measurement corresponds to the distance from one end of the elbow to the centerline, which is consistent across various pipe sizes. In the context of the given choices, the reason that the answer of 5/8 inches is accurate for this question is, in practice, this is a typical and standardized measurement for a 45-degree long radius elbow in smaller pipe sizes. Understanding this measurement is crucial for proper alignment and installation of piping systems, as it ensures that there are no obstructions and that proper distances are maintained between fittings and other components. Recognizing this standard measurement helps pipefitters and engineers maintain consistency in installations and ensures compatibility with other fittings and piping in the system.