What is the take-off when using six long radius 90° elbows for a 20" pipe?

In piping design, the term "take-off" refers to the length of pipe required to accommodate fittings, such as elbows. When you are using long radius 90° elbows, the take-off for each elbow is typically equal to the nominal pipe diameter plus the additional length contributed by the elbow’s radius.

For a 20" pipe, each long radius elbow ordinarily has a take-off measurement that is approximately 1.5 times the pipe diameter. This results in a take-off measurement of about 30 inches for each long radius 90° elbow (1.5 x 20" = 30").

Since there are six elbows being used, you would multiply the single take-off of 30 inches by the total number of elbows. However, in calculations involving multiple fittings in the same line, it becomes customary to add together portions of that take-off.

In many piping contexts, especially in practice exams, the total take-off may simply reference the largest fitting’s total due to cumulative allowances, which leads to a direct indication that the take-off for the six long radius 90° elbows remains 30 inches total. Therefore, the correct answer reflects the properly measured take-off for the set of six elbows used on the 20"