How to choose the size of reducing pipe fitting tee?

　　As usual, when selecting the size of reducing pipe fitting tee, it is necessary to know what pipe and pipe fittings to use through the process drawings, and to appreciate the typical construction and current implementation work experience. For example, for the drainage pipe, we will not accept the reducing pipe fitting tee, even if the branch pipe is smaller than the main pipe, the diameter can only be changed through bushing; as for the elbow, the typical requirement is that only two 45 ° elbows can be used for the pipe larger than DN 100 to turn 90 ° bend.

　　In principle, you can also use the combination of popular pipe fitting tee and variable pipe fitting tee. However, it is very expensive and unnecessary. At this time, it is the most suitable choice for reducing pipe fitting tee. The diameter difference between the reducing pipe fitting tee and the pipe fitting tee, for example, the upper and lower riser is de110, and the horizontal branch pipe is marked with de75, which is the same as this one. If both are marked with de110, it is equal diameter. Therefore, when we operate the reducing pipe fitting tee, we should operate according to the actual situation, and we should accept other tees at other times.