Pipe wall thickness reduction during bending
Pipe wall thickness reduction during bending
(OP)
3/4"Sch 80 and 1" Schh 80 pipes bending radius is 5D. How to calculate the wall thickness of these pipes after bending? What will be thinning after bending. Please find the attached drawing for your information.





RE: Pipe wall thickness reduction during bending
R / (R + r)
where: R is the radius of the bend; r is the radius of the pipe
(Ref: Piping Handbook 7th ed., by Mohindar L. Nayyar equation A6.1)
RE: Pipe wall thickness reduction during bending
The concern regarding loss of wall thickness at the extrados is normally countered by the 2 arguments (a) using the toroidal equations for stress in a torus , the extrados is stronger thus needs less wall thickness and (b) cold work harrdening of the extrados makes it stronger.
Check your design Code if such arguments are permitted.
RE: Pipe wall thickness reduction during bending
R - bend radius,5D
r - ? Pipe outer radius or inner radius ?
RE: Pipe wall thickness reduction during bending
r = the radius of the pipe (1/2 the outside diameter)