Knowledge classifications: threaded pipe welding elbow

　　Knowledge classifications: threaded pipe welding elbow

　　It is a method to link pipe threaded pipe fittings threaded with the welding socket with screw thread.

　　Classification of welding elbow, according to its radius of curvature to be divided, can be divided into long radius elbow and short radius elbow. Long radius elbow refers to its radius of curvature that is 1.5 times the diameter of the tube, that is, R=1.5D. short radius elbow refers to its radius of curvature that is the outer diameter of the tube, that is, R=D. D in the formula is the elbow diameter, and R is the radius of curvature. The most commonly used for 1.5D elbow, if not specified in the treaty is 1D about 1.5D, then it is to optimize the use of 1.5D. GB/T12459-2005, GB/13401-2005, GB/T10752-1995., is the most commonly used practice in China.

　　According to the pressure grade, approximately 17, tube scale and the United States is similar: sch5s, sch10s, sch10, sch20, sch30, sch40s, STD, sch40, sch60, sch80s, XS; sch80, sch100, sch120, sch140, sch160, XXS, the most commonly used is two kinds of STD and XS. According to the angle of the elbow, there are 45 elbow, 90 elbow and 180 elbow. Many kinds of way such as elbow, order orders often uses the following methods: such as “LR STD 90 8”, long radius, pressure grade for STD, 90 8 “elbow; and as,” SR XS 4 45 “short radius, pressure grade is XS, 4 of 45” elbow. The above is about the elbow classification environment.

　　Three links, there are usually two kinds of. The diameter of the three ports is equal to the diameter of the three links, the two ends of the same diameter, but the diameter of the junction with the other two diameter difference is known as the three different diameter. Performance methods are as follows: to deal with the three pass, such as the “T3” three general performance of the outer diameter is 3 inches and the diameter of the three links. To deal with different diameter three links, such as the “T443.5” performance of the same diameter of four inch diameter of 3.5 inches of three inch diameter. Pressure grade pressure grade and elbow are the same, the specification is the same category.

　　The size of this method is also head. The size of the head, is a big diameter multiplied by the head diameter, for example “86” performance head diameter is 8 inches and head diameter is 6 inches of the size of the head.

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