Overview
EN ISO 11297-4:2018 - Plastics piping systems for renovation of underground drainage and sewerage networks under pressure - Part 4: Lining with cured-in-place pipes (CIPP) specifies requirements and test methods for cured‑in‑place pipe liners and associated fittings used to renovate hydraulically and pneumatically pressurized underground drainage and sewerage systems. Designed for service temperatures up to 50 °C, this standard applies to both independent (fully structural, class A) and interactive (semi‑structural, class B) pressure pipe liners that do not depend on adhesion to the host pipeline.
Key topics and technical requirements
- Scope and applicability
- Covers CIPP liners made from thermosetting resin systems combined with compatible fibrous carrier materials, reinforcement and process‑related components.
- Applies to liners that are installed and cured in situ for pressurized sewer and drainage systems.
- Two verification stages
- “M” stage: requirements and marking for materials, pipes, fittings and ancillary components as manufactured.
- “I” stage: verification of fitness for purpose in the as‑installed condition after on‑site processing (mechanical, geometric and physical characteristics).
- Characteristics and testing
- Geometric requirements (liner wall structure and wall thickness), mechanical characteristics and reference conditions for testing are defined.
- Material characteristics and physical properties are specified for installed liners.
- Includes requirements for leak tightness of liner terminations and resistance to strain and stress corrosion.
- Exclusions
- The standard explicitly does not include requirements or test methods for abrasion, cyclic loading or impact resistance.
- Installation and quality assurance
- Guidance on preparatory work, storage, handling, equipment, installation, process‑related inspection/testing, reconnections and final documentation.
Applications and users
Practical applications:
- Rehabilitation of pressure sewer mains, force mains and other pressurized drainage and sewerage pipelines without full excavation.
- Trenchless renewal projects using CIPP lining to restore structural capacity and hydraulic performance.
Who uses it:
- Utility owners and municipalities specifying renovation contracts.
- Civil and pipeline engineers preparing technical specifications.
- CIPP manufacturers and system suppliers for product development and certification.
- Trenchless contractors, installation crews and quality assurance/testing laboratories.
- Regulators and procurement teams seeking compliance with European and ISO requirements.
Related standards
- ISO 11297-1 - General requirements for renovation system standards (used in conjunction with Part 4).
- ISO 11296-4 - Complementary requirements referenced in the scope.
- ISO 11295 - Definitions and classification of liner structural types.
- Other parts of the ISO 11297 series (Parts 2, 3, 5, 6) cover alternative renovation techniques.
Keywords: EN ISO 11297-4:2018, cured-in-place pipes, CIPP, pressure pipe liners, renovation, underground drainage, sewerage networks under pressure, trenchless rehabilitation.