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The body of the branch pipe is made of high-quality forgings, made of the same material as the pipe, including carbon steel, alloy steel, stainless steel, etc. The branch pipe seat and the main pipe are welded, and the connection with the branch pipe or other pipes (such as short pipe, wire plug, etc.), instrument, valve has three types of butt welding connection, socket welding connection, thread connection. The common manufacturing standards of the branch management table are MSS SP-97, GB/T19326 and other standards. Composition technique 1. The welded branch pipe platform is generally processed by the whole forging. The structure of the branch pipe platform is divided into the main connecting end, the strengthening part and the branch pipe connecting end. 2. Welding process evaluation of branch pipe table The groove of the weld of the branch pipe platform is a single V groove, and the form of the weld can be determined as a combination of butt weld (groove weld) and fillet weld.

3. Qualification requirements for welders of pipe table Welders shall obtain related welds in accordance with the relevant provisions of "Special Equipment Welding Operators Assessment Rules" Project qualification, considering the pipe outer diameter covering, should consider the groove surface diameter of the branch pipe table (branch pipe outer diameter), the diameter of the chief is not within the consideration scope of welder evaluation. When there is a transition bevel, the groove surface diameter refers to the actual diameter measured from the groove surface, which is generally less than the outer diameter of the branch pipe table, and the pipe table welding is the combination weld of the butt weld and fillet weld of the branch pipe with groove. So the welder holds a 6G tube certificate to cover. classification 1, butt welding branch pipe table is the most common branch connection. Its end is bevelled and welded to a straight pipe, so it is considered a butt welded pipe fitting. The butt welded support table is designed to minimize stress concentration and provide overall reinforcement. There are STD, XS, and Sch160 pressure levels for butt-welded pipe stands. 2. The base of the socket and insert branch pipe platform is the same as that of the butt welded branch pipe platform, but its branches are connected by socket and insert welding. There are two pressure levels of 3000# and 6000# on the spigot and socket branch. 3. The base of the threaded branch pipe platform is the same as that of the butt welded branch pipe platform, but its branch connection is threaded connection and does not need welding. There are two pressure levels of 3000# and 6000#. 4, miter branch for 45° branch. The branch pipe can be connected by butt welding, socket welding and thread connection. 5. Elbow branch stands are used to provide branch connections on long radius elbows or short radius elbows. The branch pipe can be connected by butt welding, socket welding and thread connection. 6. Short pipe branch table is often used for valve installation and exhaust. There are two grades of thickness, XS and XXS, ranging in length from 3.1/2 "to 6.1/2" with a jack or external thread at the end. 7. The shape of embedded tube seat is wavy and the whole is reinforced. It is butt welded with the branch pipe and is usually used for low pressure pipeline. Entry book

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