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UV-CIPP Process — Step by Step

Ultraviolet light-cured in-place pipe rehabilitation explained

Overview

The UV-CIPP Process — Step by Step explained

UV-CIPP (Ultraviolet Light-Cured In-Place Pipe) is a comprehensive pipeline rehabilitation technique using a UV-curable resin photo-initiated by ultraviolet light. The result is a "tube-in-tube" composite with substantial structural strength and 50-year service life.

Working principle

A woven fiberglass hose pre-impregnated with UV-curable resin (containing photo-initiator) is pulled into the host pipe. Compressed air pneumatically expands the liner against the host pipe wall. A UV light train then traverses the liner, photo-curing the resin in a continuous cycle. The result is a composite pipe-in-pipe structure with short-term modulus exceeding 10,000 MPa and flexural strength exceeding 200 MPa.

UV-CIPP Process — Step by Step
Step-by-Step

Process Stages

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

Inspection

CCTV crawler maps the host pipe interior — defects, dimensions, lateral connections.

Cleaning

Pipeline dredging robots and high-pressure jetting remove sediment and debris.

Liner Production

Fiberglass hose impregnated with UV-curable resin under controlled vacuum.

Pull-in

Liner pulled into the host pipe via traction equipment and Kevlar rope.

Inflation

Compressed air expands the liner to press tightly against the host pipe wall.

UV Curing

UV light train traverses the liner, polymerizing the resin in a continuous cycle.

Cool-down

Allowed to set, cured liner ends are trimmed at manholes.

Acceptance

Post-cure CCTV inspection and mechanical sample testing.

Why this method

Key advantages

  • Year-round construction — no temperature dependency
  • Low energy consumption versus steam curing
  • No water or steam required — clean operation
  • Rapid curing reduces project duration
  • Sanitary-certified for potable water rehab
  • Excellent process controllability and inspectability

Is UV-CIPP 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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