The Swagelining technique reduces the diameter of a polymer pipe by drawing through a reduction die under tension. Individual steel stalks of between 500 – 1,500m in length are lined at a spoolbase or pipeline bundle fabrication site.
Tension is maintained during insertion through the host carbon steel pipe with sufficient length of liner to allow for axial reversion once the load is removed.
The liner is then allowed to elastically revert towards its original size until a tight compressive fit is achieved within the host pipe bore. This produces a thin walled collapse resistant liner with beneficial residual strain.