About Bending Elongation

The real straight pipe length is generally shorter than its theoretical length. The theoretical length of the pipe is the same as the bend arc length in the 3D model. The difference between the real straight pipe length and the theoretical straight pipe length is the bending elongation as shown in the following figure.

1. Bending direction

2. Elongation

b(n) Bending length

l(n) Bending point location

B(n) Real bending length

E(n) Bending elongation

You can calculate the real bending point for the bend of a pipe using the following formula:

L(n) = S(n-1) + l(n) - E(n-1) - S(n)

Where,

• L(n)—The real bending point for the (n) bend

• S(n-1)—The bending spring back for the (n-1) bend

• l(n)—The theoretical bending point for the (n) bend

• E(n-1)—The bending elongation for the (n-1) bend

• S(n)—The bending spring back for the (n) bend