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Inversion CIPP Process

Steam or hot water-cured CIPP via pneumatic inversion — DN100 to DN2200

Overview

The Inversion CIPP Process explained

Inversion CIPP repair originated in Europe in the 1970s and is the most widely deployed trenchless pipeline rehabilitation method worldwide. A resin-impregnated hose is inverted into the host pipe using air or water pressure, then cured with steam or hot water.

Working principle

One end of the resin-impregnated hose is inverted and secured at the inlet manhole of the host pipe. Air or water pressure inverts the hose inside-out — the resin layer that was on the inside ends up bonded directly against the host pipe wall. Once the leading edge reaches the terminal manhole, steam or hot water is introduced to cure the resin, forming a rigid lining tightly adhered to the host pipe.

Inversion CIPP Process
Step-by-Step

Process Stages

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

Inspection

Pre-installation CCTV survey of the host pipe.

Cleaning

Sediment removal and surface preparation.

Impregnation

Dry felt tube impregnated with resin via mobile vacuum impregnation vehicle.

Drum Setup

Inversion drum positioned at inlet manhole, liner clamped to flange.

Inversion

Air or water pressure inverts the liner inside-out into the host pipe.

Curing

Steam (up to 110°C, 1200 kg/h) or hot water cures the resin.

Cool-down

Controlled cool-down maintains liner geometry.

Trim & Inspect

Liner ends cut at manholes, post-cure CCTV inspection.

Why this method

Key advantages

  • Up to 300 meters per single operation
  • Compatible with bends and curved sections
  • Mature, globally-deployed technology
  • Cost-effective for large-diameter projects
  • Pre-cure flexibility bridges cracks and gaps
  • Suitable for any host pipe material

Is Inversion 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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