Nov 17, 2009 · field cold bending. General rule of thumb for field cold bending (onshore pipelines) is 40D bend raius. Does anyone know the origin of this? Further, for large diameter pipes this gives fairly sensible bends achievable for a double random pipe length (12m). Tube Bending Summary The key rules of thumb are; Select a standard tube size; For small bend radii try to keep to one bend radius if possible and use radius of 2 x D; For larger bend radii you can have multiple radii but keep to greater than 7 x D.
Sep 23, 2011 · General rule of thumb is 3x the tube diameter, but without an internal mandrel, it really depends on wall thickness. I have seen the exact same thing regarding different manufacturers and the bendability of the tube. I had a guy bring me some Chinese 1-1/2 x 0.058 4130, and it collapsed when bending on a 6.5" radius. Jan 02, 2014 · Now, multiply that answer by the plate thickness. If the material is 0.5 in. thick: 4 × 0.5 = 2. So in this case, the minimum inside bend radius is 2 times the material thickness. Note that this is just a rule of thumb. Finding the true minimum bend radius for Author: Steve Benson.
Principles: Rotary Draw Mandrel Bending 2) Tube must “Flow” over the mandrel under the lowest pressure possible. 1 4. •Rake Angle is exaggerated For demonstration purposes. Anything that causes drag or resistance in the bend . Mar 04, 2015 · Well-Known Member. Rule of thumb is 3.5 times the tube O.D. for minimum bend radius, but min radius gets bigger as tube gets thinner. 1.5"x.083" works .095" is better though) on a 5" CLR, but you need 6" CLR for 1.5"x.065". You can also look on Hossfelds website, and it'll tell you the min thickness for each die set.