How to distinguish tees in fire protection engineering: There is a good correspondence between the names and pictures. The tees in fire pipe fittings are mainly divided into equal-diameter tees and reducing tees. The difference between it and an elbow is that it can connect three pipes and connect vertical branch pipes from straight pipes. As the name suggests, equal diameter tees connect pipes with the same nominal diameter.

Reducing tees can be divided into small and medium tees and medium and large tees. The former is used when the nominal diameter of the branch pipe is smaller than the straight pipe, and the latter is used when the nominal diameter of the branch pipe is larger than the straight pipe. For example, DN150*100: the main pipe is DN150, and the branch pipe is DN100. The finished product rarely has three pipes with different diameters. The grooved tee only refers to a connection method of pipe fittings. Most of them are divided into: welding and flange. , clamp (groove type).