![]() ![]() The measurements are shown in imperial but all the constants are the same for metric. Solve for pipes A, B, and C in the image below using 45 degree fittings and again using 22.5 degree fittings. If your studying for a plumbing exam you will need to remember the 45˚ constants. See the table below for the most common fitting constants. Once you know the true offset you can use a table to determine the setback and diagonal center to center measurements. Step 2 – Finding the Setback and Diagonal You then need to take the square root of the result to get the true offset. This simply means that the offset squared plus the rise squared will equal the true offset squared. However, the easiest way to any degree rolling offset regardless of the angle is this: TravelA2+B2+C2. The confusion here seems to be language and steps. I wanted to show how a 45° offset is solved from start to finish no short cuts. The first number you need to find when calculating a rolling offset is the “true offset” which is found using Pythagoras’ theorem. I wrote this for the struggling guy who wants to feed his family. To visualize the travel of the pipe, imagine a three dimensional box with the pipe entering at one corner and exiting at the farthest diagonal corner. The following will illustrate how to use the rolling offset formula in plumbing. ![]() A rolling offset in a plumbing system is when a pipe changes in both the horizontal and vertical planes. ![]()
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