Elbow not only has the characteristics of saving space and reducing weight. It has good sealing performance, butt welding elbow sealing principle is mainly to professional welding and testing system to guarantee. Elbow has the characteristics of use, it it easy to use from the elbow direct docking with the pipeline system. Of course, such a docking and testing is the need for a certain technology to protect the. The current test elbow welding method whether OK mostly use hydraulic test.

      The classification of butt welding elbow:

      Classification of butt welding elbow can be carried out in accordance with the different classification criteria, and we would like to introduce today is to three different classification standard of classification is introduced.

      1. elbow divided according to its radius of curvature, can be divided into long radius elbow and short radius elbow. The outer diameter of the tube radius of curvature radius of elbow length is equial to 1.5 times, namely R=1.5D. The radius of curvature of the short radius elbow is equal to pipe diameter, R=1D. Type D in elbow diameter, curvature radius of R.

      If divided by the pressure rating to about 17 species, and American Standard pipe is the same: sch5s, sch10, sch20, sch30, sch40s, STD, sch40, sch60, sch80s, XS, sch80, sch100, sch120, sch140, sch160, XXS, which is the most commonly used is two kinds of STD and XS.

      According to the angle of bend, 45 degree elbow, 90 degree elbow and 180 degree elbow.

      In the construction of the characteristics of elbow

      Features a: butt welding elbow weld, butt welding elbow in the welding construction operation after the completion of the need according to the external environment of the actual situation or pipe rust or corrosion treatment, to avoid the elbow in the weld corrosion or corrosion.

      Features: usually welded elbow is welding in pipeline construction site, which is due to all kinds of pipe welding standards are different, the need according to the grade of pipe welds the field welding. According to the need of different grade of pipe weld to the field welding, this is another characteristic of the elbow.

      Three characteristics: mainly used for butt welding elbow pipe connecting the two different end of the radius or diameter for pipeline. This type of elbow generally need according to the specific engineering requirements or specific drawings for production, in addition to meet the requirements of the pipe diameter must also consider the pipeline from the specific situation, such as pipeline conveying pressure, fluid viscosity, wear, corrosion, transmission fluid temperature in many aspects factors. Has certain pertinence and usability, this is another important elbow construction features.