pipe wall thinning due to bending
pipe wall thinning due to bending
(OP)
The B31.1 code gives 'recommended' values to use for thinning when bending pipe in section 102.4.5. From what I hear, these values are very conservative. (8% for 5D and 25% for 3D) What are reasonable values from experience? I realize that the thinning is dependent on method, size, and wall thickness. What could I expect with a 30" pipe with 1" wall, given heat induction bending? Any other values based on experience for other sizes would also be appreciated.
thanks
Mark
thanks
Mark





RE: pipe wall thinning due to bending
Sounds to me like someone has already made a decision irrespective of the Piping Code recommendation (which by the way is based on practical experience).
RE: pipe wall thinning due to bending
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: pipe wall thinning due to bending
Regards
StoneCold
RE: pipe wall thinning due to bending
BigInch
-born in the trenches.
http://virtualpipeline.spaces.msn.com
RE: pipe wall thinning due to bending
If you have a lot of bends, ask them to demonstrate that they can do what they say they can before you place a big order.
Check the wall on each bend and reject any that are too thin.
NozzleTwister
Houston, Texas
RE: pipe wall thinning due to bending
RE: pipe wall thinning due to bending
Also, some EU design codes explicitly allow for thinning at the extrados toa min wall less than the standard staight pipe minwall , due to the effects of work hardening and the fact that the theoretical stength of such a bend ( which has 2 radii of curvature- so called toroidal equations) is tronger tahn the original cylinder. But I thibnk the US piping codes to not allow for this for pipiong in the workspace.
RE: pipe wall thinning due to bending
Clinddu