Spiral-Wound Pipe Lining
A method of pipe rehab in which a ribbed plastic strip is spirally wound by a winding machine to form a liner which is inserted into a defective pipeline. The annular space may be grouted or the spiral liner expanded to reduce the annulus and form a Close-Fit liner. In larger diameters, the strips are sometimes formed into panels and installed by hand. Grouting the annular space after installation is recommended. See Lining with spirally wound pipes.