What is the travel on a rolling offset that has a run of 18'', a roll of 24'', and a height of 12''?

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Multiple Choice

What is the travel on a rolling offset that has a run of 18'', a roll of 24'', and a height of 12''?

Rolling offset travel is the distance along the pipe centerline when you move from the start to the end of an offset made with two bends and a straight run, taking into account how the run, height, and roll combine in three dimensions. The run and roll form a right triangle, giving a diagonal length of 30 inches (because 18, 24, and 30 form a Pythagorean triple). The vertical height adds extra length because the pipe must rise through that offset, so you must account for that extra centerline length as well. When you combine the diagonal from the run and roll with the vertical adjustment from the height in this geometry, the total centerline travel comes out to 34 15/16 inches. That’s why this option best matches the actual length along the offset path.

Rolling offset travel is the distance along the pipe centerline when you move from the start to the end of an offset made with two bends and a straight run, taking into account how the run, height, and roll combine in three dimensions. The run and roll form a right triangle, giving a diagonal length of 30 inches (because 18, 24, and 30 form a Pythagorean triple). The vertical height adds extra length because the pipe must rise through that offset, so you must account for that extra centerline length as well. When you combine the diagonal from the run and roll with the vertical adjustment from the height in this geometry, the total centerline travel comes out to 34 15/16 inches. That’s why this option best matches the actual length along the offset path.

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