Definition: electrical standard single reinforced welded three is a charge plus a small branch pipe in the production process is divided into two kinds: one is the seamless cold drawn three, the other is a standard single reinforced electric welded welded three. Obviously, the two large size is in charge of, take out of the middle small size is the branch. In pure oxygen in the pipeline, there is a general pressure, the greater the oxygen activity.
Two manufacturing process: electric standard single reinforcement welding system three general is divided into equal diameter of the three, diameter of the three links, materials are carbon steel, alloy steel and stainless steel. Such as the use of electric single reinforced welded pipe three, as long as the debris in the mobile with the oxygen flow, due to the change of diameter, flow rate changes may be caused by debris and pipe production by fire or collision due to electrostatic discharge velocity changes with the oxygen tube may cause fire.
Three. Application scope: electric standard single reinforcement welding system three is widely used in petroleum, aerospace, chemical, metallurgy, electric power, military, engineering supporting industrial pipeline. Electric standard single reinforced welded three material: A105, 20#, Q235, carbon steel, stainless steel, alloy steel; electric single reinforced welded three caliber DN10--100; electric standard single reinforced welded three and the export pressure: SCH10, SCH20, SCH40, SCH80.
Four. Implementation of standards:
GB/T12459-2005
GB/T13401-2005
GB/T10752-1995
GB/T14383-93
HGJ514-87
DL/T695-1999
D-GD0418
Five. Caliber classification:
1, the same size three: three as the pipe diameter and charge
2, reducing three way pipe diameter is less than the diameter of the head: Three
Six. According to the classification of docking form
1, three: three welded pipe and connecting pipe butt welding.  
2, socket type three pass: is the connection pipe inserted into the end of the three pass after welding or welding of the three pipe fittings. 3, card type three links: is the end of the card sleeve joint, insert the pipe fittings and then tighten the three pipe fittings.  
4, thread type three way: threaded connection pipe fittings of the three pipe fittings.
Seven. According to material classification can be divided into three stainless steel, carbon steel three links, copper, PVC, three pass, etc..
Eight. According to the classification of branch
1, three: three vertical pipe branch supervisor.  
2, three: three inclined pipe branch pipe and a certain angle to the supervisor.
Strengthen the three welding precision requirement is not high, with the piping connection strong, strong pressure resistance, good sealing device, convenient maintenance, safe and reliable operation and other advantages. Three through strengthening welding is widely used oil, aerospace, chemical, metallurgy, electric power, military and engineering supporting industries such as pipeline. Strengthen the welding is three a supervisor with a small branch pipe, obviously, two large scale is in charge of, directly out of the small scale is the branch. In pure oxygen pipeline, usually there is pressure, then the oxygen activity must be used to strengthen the welding more; three, to ensure that the entire pipeline. Flow and pressure capability