# Bending PE Pipes

## Bending PE pipes calculator

A PE pipe is flexible and can be bended. For pressurized pipe the bending radius should not be less than

*r _{min} = 60 d (1)*

*where *

*r _{min} = minimum bending radius (m, in)*

*d = pipe diameter (m, in)*

For pipe without pressure - or for pressure pipes during installation - the bending radius should not be less than

*r _{min} = 30 d (2)*

#### Example - Min. Radius when bending PE Pipe

The minimum bending radius for *300 mm (0.3 m)* PE pipe during installation can be estimated to

*r _{min} = 30 (0.3 m)*

* = 9 m *

### Radius and Angle vs. Deflection when bending Pipe

The radius of the bending pipe can be hard to measure in field. In practice a rope or chain may be tied to the end of the pipe and the end is pulled until deflection is achieved.

**Deflection** for a given radius and length of deflecting pipe can be calculated as

*h = l ^{2} / (2 r) (3)*

*where *

*h = deflection of pipe (m, in)*

*r = radius of bending pipe (m, in)*

*l = length of pipe from fixed position (m, in)*

Eq. 3 can be modified with eq. 2 to calculate maximum deflection for minimum radius to

*h _{max} = l^{2} / (60 d) (3b)*

*where *

*h _{max} = deflection at minimum radius (m) *

The **angle** can be calculated as

*α = l 180 / (π r) (4)*

*where *

*α = angle (degrees)*

Eq. 4 can be modified with eq. 2 to calculate the maximum angle at minimum radius as

* α _{max} = l 60 / (π d) (4b)*

### Bending PE Pipe Calculator

This calculator can be used to calculate maximum deflection and angle of deflection for a PE pipe during installation. It is based on eq. 3b and 4b.

*d - diameter of pipe (mm)*

*l - length of pipe from fixed position (m)*