New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is the run length of a 45-degree offset when the travel is 40 inches?

1. 26-1/4

2. 28-1/4

3. 30-1/4

4. 32-1/4

The correct answer is: 28-1/4

To determine the run length of a 45-degree offset when the travel is 40 inches, the relationship between travel distance and run length must be applied. In a 45-degree offset, both the vertical and horizontal components of the pipe create a right triangle, where the hypotenuse represents the travel distance. For a 45-degree angle, the vertical and horizontal distances (the run length in each direction) are equal, allowing us to use the Pythagorean theorem. When the travel is 40 inches, the equation can be simplified using the factor for a 45-degree angle: Run length = Travel / √2, or equivalently, because both the run and rise are equal, you multiply the run length by the square root of 2: Run length = Travel / sqrt(2) = 40 / 1.414, which approximates to 28.3 inches. This value is best rounded to a convenient fraction, which in this case, aligns closely with 28-1/4 inches. Hence, identifying it as the correct answer reflects an understanding of how 45-degree offsets work geometrically and mathematically. This understanding aligns with practical applications in the trade, making the answer not only accurate mathematically