The most basic difference of them is the elbow relatively short than bend, R = 1D to 2 D is elbow More than 2D is bend. 1.5, 3 and 4.5 R are the most common bending radii in industry.Ī pipe bend typically flows smoother since there are not irregular surfaces on the inside of the pipe, nor does the fluid have to change direction abruptly. Reference to any international / industry standard need to be traced. If this bending radius is less than 1.5R, it is called Elbow. Pipe bends typically have a minimum bending radius of 1.5 times pipe radius (R). Bends are usually custom-made (using a bending machine) on site and suited for a specific need. A bend is usually meant to mean nothing more than that there is a “bend”– a change in direction of the piping (usually for some specific reason) – but it lacks specific, engineering definition as to direction and degree. A pipe bend is the generic term for what is called in piping as an “offset” – a change in direction of the piping.
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