Elbow: In the pipeline system, the elbow is a pipe fitting that changes the direction of the pipeline.
The classification of elbows: according to the angle, there are three most commonly used 45 ° and 90 ° 180 °. In addition, according to the needs of the project, other abnormal angles such as 60 ° are included.
The materials of the elbow are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, etc.
The connection methods with the pipe are: direct welding (the most commonly used method) flange connection, thread connection with socket connection and so on.
According to the production process, it can be divided into: welding elbow, stamping elbow, casting elbow, etc.
A pipe fitting commonly used in pipeline installation, used for connection outside the bend of the pipeline.
Technical requirements: 1 Since most of the pipe fittings are used for welding, in order to improve the welding quality, the ends are turned into grooves, leaving a certain angle, with a certain edge, this requirement is also strict, how thick the edge, what is the angle And the deviation range is specified. Surface quality and mechanical properties are basically the same as tubes. For the convenience of welding, the steel grades of the pipe fittings and the connected pipes are the same.
2 That is, all the pipe fittings must undergo surface treatment, the iron oxide skin on the inner and outer surfaces is sprayed off by shot peening, and then coated with anti-corrosion paint. This is for export needs. In addition, in China, it is also convenient for transportation to prevent rust and oxidation, all of which must be done in this regard.
3 is the packaging requirements. For small pipes, such as exports, it is necessary to make a wooden box, about 1 cubic meter, stipulating that the number of elbows in this box should not exceed one ton. The standard allows sets, that is, large sets are small, but The total weight should generally not exceed 1 ton. For large items y, they must be packaged individually. For 24 ”, they must be packaged individually.
