When making take-off calculations for elbows, which factor is considered for each fitting?

In making take-off calculations for elbows, the diameter of the pipe is considered because it directly influences the fitting's dimensions and the amount of material required. The diameter determines the size of the elbow fitting needed to maintain the proper flow and pressure in the system. Each diameter correlates with specific fitting sizes, which must be accounted for in the overall calculations to ensure the integrity and functionality of the piping system.

Although the length of the pipe, angle of the elbow, and the material of the pipe are important factors in other contexts, they do not specifically pertain to the calculations for elbows in the way that the diameter does. The fitting's diameter is paramount in determining how it will interface with other components and affect overall system performance.