Classification of butt welding elbow

(1) the butt welding elbow is divided according to its radius of curvature. It can be divided into long radius butt welding elbow and short radius butt welding elbow. The radius of curvature of the long radius butt weld elbow is equal to 1.5 times the outer diameter of the pipe, or R=1.5D. The radius of curvature of the short radius butt weld elbow is equal to the outer diameter of the pipe, or R=1D. The D in the formula is the diameter of the butt welding elbow and R is the radius of curvature. If there is no special description, the general choice is 1.5D elbow.

(2) if divided by the pressure level to about seventeen, and the American Standard pipe is the same, are: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, one of the most commonly used STD and XS two.

(3) according to the angle of the elbow, there are 45 degree butt welding elbow, 90 degree butt welding elbow and 180 degree butt welding elbow and other different angle elbow.

(4) materials are: carbon steel, alloy steel and stainless steel.