The two terms used to describe the pipe and its perpendicular connection are header and branch. Pay particular attention to the weld dot used to represent the weld on the 12″ and smaller branch outlet on the reducing tee. Notice the weld tee requires three welds be made to install the fitting within the header. Since all pipe lines 12″ and smaller are drawn single line, and therefore are difficult to distinguish pipe diameter sizes, a branch that is 12″ and smaller must be identified with a note that defines the header size and the branch size, 14 × 8, as shown in Figure 3.24. A reducing tee has a branch that is a smaller line size than the header.
On a straight tee, all three outlets are the same nominal pipe size. One is known as a straight tee, and the other is a reducing tee. Notice there are two tees installed in Figure 3.24. Figure 3.24 shows a pipe header with two branch connections. While the perpendicular line that connects to the header is known as a branch. The main run of pipe is called the header.
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