What diameter of pipe can be bent using a pipe bender?
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By using a pipe bender to mechanically cold-bend seamless steel pipes and fabricating elbows at non-standard angles on-site, what pipe diameter can be bent? Can a DN200 pipe be bent? What other methods are there for manufacturing elbows at non-standard angles at the construction site for large-diameter steel pipes?
Part of the answer provided by Baidu AI: CNC pipe bending machines are capable of handling pipes with larger diameters, typically ranging from 50 millimeters to 100 millimeters. Large CNC pipe bending machines can even handle pipes with a diameter of over 200 millimeters, and are suitable for industrial applications such as shipbuilding, petrochemicals, and large-scale machinery manufacturing
For larger pipe diameters, hot bending is generally used, as cold bending tends to cause defects such as wrinkles.
Tencent AI has answers: there are elbow machines capable of bending pipes with a diameter exceeding DN300 and a wall thickness of over 10 mm. No source was provided, so it’s unclear whether it’s true or not.
To manufacture elbows with large diameters, I’ve heard that one method involves cutting off a portion of a standard elbow to obtain an elbow with the desired angle. I think this method is suitable for bends with a large curvature (close to 90 degrees) ； For bends with a small degree of curvature (close to 180 degrees), mechanical bending may still be the better option.
For the large ones, just go all out; only the small ones need to be bent
What I’ve encountered: Generally, those 2 inches and smaller can be bent cold, while thicker ones require hot bending, although they can also be bent cold； It is also necessary to check whether the outer diameter, wall thickness, material, wall thickness reduction after bending, pressure resistance, mechanical properties, etc. of the pipeline meet the design requirements.
Is it a lack of elbows or a lack of welding rods?
I saw new machines that are capable of bending DN600 pipes. Forum post 【Ten Years of Rapid Development in Chemical Equipment】 2792-2025: Breaking Monopolies! Huayou Engineering Construction Company’s self-developed \"bending pipe tool\" proves useful in East African projects (https://bbs.hcbbs.com/thread-5704226-1-1.html)