A fully structural liner has stand-alone capacity, withstanding all applicable loads for the design lifetime without failure.
This type of liner provides the same structural integrity as a newly installed open-cut PE pipe, designed to withstand all loading scenarios for 50 or 100 years and beyond. If the host pipe was to completely disintegrate over its remaining lifetime, a correctly designed liner would continue to withstand all forces it is subjected to.
For low-pressure water, wastewater, and gas rehabilitation, PE liners are typically fully structural. This applies to both Die Draw tight-fit liners and slip liners. The optimum design for a Die Draw fully structural liner is a tight fit against the internal bore of the host pipe, maintaining the original flow capacity. However, where a reduction in bore size can be tolerated, a slip liner may be used – though this often requires grouting for stability.
The versatility of the Die Draw process allows for the engineering of any bore size requirement within the constraints of the host pipe – from slip liners to fully tight-fit liners.
A fully structural liner is essential where the condition of the host pipe is severely degraded, and total loss of structural integrity is likely within the liner’s lifetime.
Over 1,000,000m of fully structural PE liners have been installed in UK water and gas pipelines since the late 1980s, with similar lengths installed globally. This is a proven, well-established method.
You ay also want to consider interactive semi-structural liners, where the Die Draw process delivers its most efficient environmental solution while improving the flow capacity of the original pipeline.
