Technical requirements for pipe fittings

The technical requirements of the pipe fittings are as follows: First, the geometrical dimensions include the outer diameter, the inner diameter, and the wall thickness. It is also required to control the radius of curvature. For example, if the radius is 1.5d, the radius of curvature must be within the required tolerance.

Second, since most of these pipe fittings are used for welding, in order to improve the quality of the welding, the ends are all turned into bevels, leaving a certain angle with a certain edge. This requirement is also stricter, how thick is the side, and the angle is And the range of deviations are specified, and the geometry is much larger than the pipe fittings.

Third, the surface quality and mechanical properties are basically the same as the tube. For the convenience of welding, the steel grade of the pipe to be connected is the same.

Fourth, all the pipe fittings must be surface treated, and the iron oxide skin on the inner and outer surfaces is sprayed by shot peening, and then coated with anticorrosive paint. This is not only for export needs, but also for the purpose of facilitating transportation to prevent corrosion and oxidation in the country.

The fifth is the requirement for packaging. For small pipe fittings, such as export, it is necessary to make wooden boxes, about 1 cubic meter. The number of elbows in such boxes is about no more than one ton. The standard allows suits, that is, large sets. Small, but the total weight can not exceed 1 ton. For large pieces, a single package, like a 24", must be a single package. The other is the packaging mark, the mark is to indicate the size, steel number, batch number, manufacturer's trademark. The pipe is stamped with a packing list And documents such as warranty books.