Because the elbow has a good overall performance, it is widely used in chemical engineering, construction, water supply, drainage, petroleum, light and heavy industry, refrigeration, health, plumbing, fire protection, power, aerospace, shipbuilding and other basic projects.
1, because most of the pipe used for welding, in order to improve the quality of welding, the end of the car is made into a groove, leaving a certain angle, with a certain edge, this requirement is also more strict, the edge is thick, the angle is how much and deviation The scope is regulated. The surface quality and mechanical properties are basically the same as the tubes. For ease of welding, the fittings are the same as the steel type of the pipe being joined.
2. All the pipe fittings must be surface-treated. The inner and outer surface oxide scales should be sprayed off by shot blasting and then painted with anti-corrosion paint. This is for export needs. Moreover, in order to facilitate transportation and prevent rust oxidation in the country, we must do this work.
3, is the packaging requirements for small pipe fittings, such as exports, you need to do wooden boxes, about 1 cubic meters, the number of elbows in this box is not more than a ton, the standard allows packages, that is, large sets of small, However, the total weight cannot exceed 1 ton. For large y, a single package, like 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 and so on.