Technical requirements for pipe fittings
Geometric dimensioning include outer diameter, inner diameter, wall thickness. The radius of curvature must also be controlled. For example, the length of the radius is 1.5D. The radius of curvature must be within the required tolerance range. Most of the pipe fittings are used for welding. In order to improve welding quality, the end is beveled, leave fixed angle and edge. This requirement is also strict. How thick the edge is? What is the angle? What is the tolerance range? It all have rules. There are many more terms than steel pipe in geometric dimensions. The surface quality and mechanical properties are basically the same as the pipe. For welding convenience, the steel grade is the same as the connected pipe. All pipe fittings should be treated with surface treatment. The inner and outer surface of the oxide sheet is sprayed off by a shot, and then coated with antiseptic paint. This is both for export purposes and to prevent rust. About the packing requirements, for small pipe fittings, such as exports, wooden cases are required. The box size is about one CBM. It is stipulated that the number of elbows in such cases should not exceed one ton. The standard allows suits. It means putting small pipe fittings into large pipe fittings. But the total weight cannot exceed 1 ton commonly. For large items, individual packaging is required. Another is the packaging mark. Mark is to indicate size, steel number, batch number, manufacturer's trademark. Steel seals shall be printed on the pipe fittings, together with the packing list, warranty and other documents.