There are mainly two types of welded tees used in some high-voltage power plants. One type is to weld a tee with thick-walled pipes, and the other type is to weld a pipe slightly thicker than the pipe and then reinforce it around with reinforcing elements. When making tees by welding thick pipes, since the welding process is relatively simple, it should be considered first when thick-walled pipes can be solved. In the absence of thick-walled pipes, the three-way fittings can be welded with reinforcing elements according to specific conditions and local conditions.

　　In the past, due to the difficulty in obtaining thick-walled tubes, most high-voltage power plants adopted the method of welding tees with reinforcing elements. Three-way fittings welded with reinforcing elements are generally available in types such as single-rib, butterfly, shawl, and clamp. Test and operation have proved that the single rib and butterfly type have better reinforcing effect, and the manufacturing process is also simple 笮.It can be promoted and used. However, for the shawl reinforcement type, since the reinforcing elements are mainly bonded to the pipe wall rather than welded, tests have proved that the reinforcement effect is not very reliable. Meanwhile, operational experience has also demonstrated that this reinforced type of welded tee has experienced leakage in some power plants (such as those in Huainan, Minhang, and Zhabei) after several years of installation. Due to the complexity of the situation, it seems not advisable to adopt it.

　　As for other reinforcing types, some have poor reinforcing effects and some have complex manufacturing processes. None of them are as good as the single-rib and butterfly types. Therefore, they are rarely adopted by power plants. In addition, in systems such as the first machinery, petroleum, and chemical industries, many units have conducted extensive experimental research on welded tees, achieving certain results and promoting their application in high-pressure components. There is not much knowledge about the experience of using welded tees in these departments, so it will not be introduced here.

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