Technical requirements for pipe fittings
Geometrical dimensions include outer diameter, inner diameter, and wall thickness. It also requires to control the radius of curvature. For example, if the radius length is 1.5d, then the radius of curvature must be within the required tolerance range. Since most of these pipe fittings are used for welding, to improve the welding quality, the ends are beveled, with a certain angle and a certain side. This requirement is also strict, how thick the side is, how much the angle is, and the deviation range There are regulations, and there are many more items in geometric dimensions than pipe fittings. The surface quality and mechanical properties are the same as the pipe. For the convenience of welding, the steel grade of the connected pipe is the same. Fourth, all pipe fittings must undergo surface treatment, and the oxide scale on the inner and outer surfaces is sprayed off by shot blasting, and then coated with anti-corrosive paint. This is not only for export need but also for the convenience of transportation in the country to prevent corrosion and oxidation. This work must be done. Fifth, it is the requirements for packaging. For small pipe fittings, such as export, wooden boxes are required, about 1 cubic meter. The number of elbows in this box cannot exceed one ton. This standard allows sets, that is, large sets. Small, but the total weight generally cannot exceed 1 ton. For large items, it must be packaged individually, like 24″ must be packaged individually. The other is the packaging mark, which must indicate the size, steel number, batch number, and manufacturer’s trademark. The pipe must be stamped with a steel stamp and a packing list is attached. And documents such as warranty.