Relining, also known as single-pipe lining, creates a leak-free 'pipe-in-pipe' system that is structurally and hydraulically as good as new.

The new pipes are pushed or pulled into the existing pipeline, and the annular space between them is filled with a pressure-resistant grouting compound — typically a mixture of binding agents — to fix the new pipe in place and allow it to bear the entire static load. This secures the newly installed pipe in place and enables it to bear the entire static load.

Relining or single-pipe lining can be carried out using either non-circular (NC Line) or circular pipes. Amiblu GRP pipes are particularly well suited to pipe rehabilitation, being lightweight, high-quality, corrosion-resistant, easy to install, and fully load-bearing. In short, relining restores the pipeline to as-new condition in every respect.