New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is the end to center measurement of a 90 degree long radius elbow?

1. 1-1/2 NPS

2. 2 NPS

3. 3 NPS

4. 1 NPS

The correct answer is: 1-1/2 NPS

The end to center measurement of a 90-degree long radius elbow is determined by the nominal pipe size (NPS) and specifically refers to the distance from one end of the elbow to the centerline of the elbow. For a long radius elbow, this measurement is typically 1.5 times the NPS. In this case, if we consider nominal pipe sizes, the answer of 1-1/2 NPS indicates that for a 1.5-inch NPS pipe, the distance from the end of the elbow to the center of the radius is indeed 1.5 inches. This is a standard measurement used in pipe fitting and ensures consistent installation practices across various applications where long radius elbows are common, such as in plumbing and HVAC systems. The other measurements do not align with the standard for long radius elbows specific to this scenario, as they represent different NPS sizes or configurations not applicable to the question regarding the end to center measurement for a 90-degree long radius elbow. Understanding the dimensions appropriately aids in correct pipe fitting and prepares the individual for real-world applications in plumbing, HVAC, or industrial piping systems where pipe fitting accuracy is crucial.