Elbow: in the piping system, the elbow is the pipe that changes the direction of the pipeline.
Elbow classification: according to the angle, there are 45 degrees and 90 degrees 180 degrees three most commonly used, in addition, according to the project needs also include 60 degrees and other non normal angle elbow.
Elbow materials are cast iron, stainless steel, alloy steel, calcined cast iron, carbon steel and so on.
The connection with the pipe is: direct welding (the most commonly used way), flange connection, threaded connection with socket connection, etc..
According to the production process can be divided into: welding elbow, stamping elbow, casting elbow, etc..
Pipe fittings commonly used in pipe installation, used for the connection outside the pipe bend.
Use: connect two tubes with same nominal diameter or different pipe, make the pipe bend at a certain angle.
1, the material is divided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy and so on. (but the wooden factory is pure forging)
2, the division of production methods can be divided into:
pushing, pressing, forging, casting and so on. (usually pure forging now)
3 makes the standard can be divided into: GB, standard, water, electricity, American Standard German standard, Japanese standard etc.
4 according to its radius of curvature, it can be divided into long radius elbow and short radius elbow. The long radius elbow refers to the outer diameter of the pipe whose radius of curvature is equal to 1.5 times, that is, R=1.5D. A short radius elbow refers to its radius of curvature equal to the outer diameter of the pipe, i.e., R=1.0D. (D is elbow diameter, R is radius of curvature).
5 if divided by the pressure level to about seventeen, and the American Standard pipe is the same, are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; one of the most commonly used is STD and XS two.
Technical requirements: 1, because most of the pipe fittings used for welding, in order to improve the quality of welding, the end of the car has a groove, leaving a certain angle, with a certain edge, this requirement is relatively
strict, edge thickness, angle and deviation range are prescribed. The surface quality and mechanical properties are basically the same as those of the tubes. To facilitate welding, the fittings are the same type of steel as the pipe being connected.
2 is that all the fittings must be treated by surface treatment. The iron oxide scales on the inner and outer surface are sprayed by shot peening, and then coated with anticorrosive paint. This is for export needs, moreover, in the domestic is also in order to facilitate transportation, prevent rust oxidation, must do this work.
3 is the packaging requirements for small fittings, such as exports, you need to do wooden boxes, about 1 cubic meters, the provisions of this box in the elbow number can not exceed one ton, the standard allows packages, namely large sets of small, but the total weight can not exceed 1 tons. For large pieces of Y, we need a single package, like "24", we must have a single package. The other is labeled packaging, labeling is to indicate size, number, batch number, manufacturer trademark etc..