The radius of curvature of a long-radius (LR) elbow is 1.5 times the pipe diameter, but a short-radius (SR) elbow has a radius equal to the pipe diameter. When the ends differ in size, it is known as a reducing (or reducer) elbow.Įlbows are also categorized by length. The ends may be machined for butt welding, threaded (usually female), or socketed. See also: Street elbow Short-radius (or regular) 45° elbow (copper sweat) Long-radius (or sweep) 90° elbow (copper sweat)Īn elbow is installed between two lengths of pipe (or tubing) to allow a change of direction, usually a 90° or 45° angle 22.5° elbows are also available.
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