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Spiral Wound Lining Process

Live-flow trenchless rehabilitation for large-diameter pipes and box culverts

Overview

The Spiral Wound Lining Process explained

Spiral-wound liner repair is the preferred method for large-diameter pipes and box culverts where rehabilitation must occur under live-flow conditions. PVC-U strip profiles are spirally wound and mechanically interlocked to form a continuous new pipe inside the host.

Working principle

Modular winding equipment is assembled underground at the project manhole. Prefabricated PVC-U strip profiles (with double-interlock T-rib design) and stainless steel reinforcement strips are fed into the machine. The winder simultaneously winds these materials, locking them via specially designed seam interlocks. The new pipe is continuously formed and advanced forward through the host pipeline, all while flow continues unimpeded.

Spiral Wound Lining Process
Step-by-Step

Process Stages

From pre-installation inspection through post-cure acceptance — here's the full project workflow.

Equipment Assembly

Modular winding machine assembled underground at the entry manhole.

Profile Loading

PVC-U strip profile and stainless steel reinforcement loaded onto the winder.

Winding

Machine winds the strip profile in a spiral, interlocking seams continuously.

Advance

Newly formed liner advances through the host pipe with the winder.

Annular Grouting

Cement grout injected between new liner and host pipe.

Acceptance

CCTV survey confirms liner integrity and continuity.

Why this method

Key advantages

  • Live-flow installation — no service interruption
  • Suitable for large diameters DN600 to DN2500 (and DN3000 box culverts)
  • Handles rectangular, egg-shaped, and circular cross-sections
  • High-strength T-rib structural design
  • Recyclable PVC — environmentally friendly
  • 50-year service life with PVC corrosion resistance

Is Spiral Wound Lining right for your project?

Send your pipe diameter, length, and host material — our engineers will recommend the optimal method for your specific project conditions.

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