Technical requirements and process design of pipe fittings

Technical requirements and process design of pipe fittings

The geometric dimensions of pipe fittings include outer diameter, inner diameter and wall thickness. It is also required to control the radius of curvature. For example, if the radius length is 1.5D, the radius of curvature is within the required tolerance.

Technical requirements and process design of pipe fittings:

The geometric dimensions of pipe fittings include outer diameter, inner diameter and wall thickness. It is also required to control the radius of curvature. For example, if the radius length is 1.5D, the radius of curvature is within the required tolerance. Since most of these pipe fittings are used for welding, in order to improve the welding quality, the ends are turned into grooves, the reserved angles and the edges of the belt are also strict. There are provisions on the thickness of the edges, the angle and the deviation range, and there are many more geometric dimensions than the pipe fittings. The surface quality and mechanical properties are basically the same as those of pipes. For large pieces, a single package is required, such as 24 “. Another is the packaging mark, which should indicate the size, steel number, batch number and manufacturer’s trademark. The steel seal shall be stamped on the pipe fittings, and the packing list, warranty and other documents shall be attached.

The production process of tee is basically the same. Blanking shall be carried out according to different specifications of tee. Sand blasting shall be carried out after blanking, and the iron oxide scale on the surface shall be removed before forming. Hydraulic bulging method is used for forming. There is a mold, the bottom of the mold is straight, and there is a flange hole on the top. For the convenience of welding, the steel grade is the same as that of the connected pipe. For the requirements of packaging, for small pipe fittings, such as export, wooden boxes need to be made, about 1m3. It is stipulated that the number of elbows in such boxes can not exceed one ton. The standard allows suits, that is, large sets and small sets, but the total weight can not exceed 1 ton. After the pipe is put in, the pipe is fixed with a hydraulic cylinder, both sides are filled with liquid, bulge inward, squeeze the pipe into a “convex” shape, and then cut the bulge from an appropriate position to form a groove.

All pipe fittings shall be subject to surface treatment, and the oxide scale on the internal and external surfaces shall be sprayed off by shot peening, and then painted. This is not only for export needs, but also to facilitate transportation and prevent corrosion and oxidation at home. Important oxidation treatment shall be carried out during the surface treatment of pipe fittings. According to the specific conditions and standards, the pipe fittings shall be subject to two shot peening treatments. As there is work hardening in the machining process, heat treatment is also required. The production process of pipe fittings is such a situation.

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