ISO 11297-3:2018

Overview - ISO 11297-3:2018 (close-fit lining)

ISO 11297-3:2018 is the International Standard that specifies requirements and test methods for close-fit lining systems used to renovate underground drainage and sewerage networks that operate under pressure. Used together with ISO 11297‑1 (General), this part covers polyethylene (PE) pipes - solid wall single-layer or co‑extruded - that are factory- or site‑reduced to form a close‑fitting, independent or interactive pressure pipe liner. The standard applies to pipes, fittings, joints and the installed lining system and uses 20 °C as the reference operating temperature.

Key topics and technical requirements

• Scope and applicability: Renovation of underground drainage and sewerage networks under pressure; excludes PE‑coated pipes with peelable outer layers.
• Materials and product stages: Requirements for raw materials and for products “as manufactured” (M stage) and “as installed” (I stage).
• Geometric, mechanical and physical characteristics: Specifications for dimensions, strength and physical performance of pipe and fittings.
• Jointing and fittings: Requirements for joints, fusion methods, electrofusion and associated fittings suitable for close‑fit liners.
• Installation practice: Guidance on preparatory work, storage, handling, reduction/reforming, winching/rod-pulling, and lining termination.
• Inspection, testing and sampling: Process‑related inspection, final testing, sampling plans and documentation to verify fitness for purpose after site processing.
• Regional requirements: Provisions allowing reference to mandated regional or European standards where applicable.
• Normative annex: Includes test method(s) such as determination of memory ability for factory‑folded heat‑reverted PE pipe.

Practical applications and target users

• Renovation contractors performing trenchless relining of pressurised sewer and drainage mains.
• Utility owners and asset managers specifying renovation materials and acceptance criteria.
• Pipe and fitting manufacturers designing PE close‑fit liners and joints.
• Inspection, testing and certification bodies verifying installed lining fitness and conformity.
• Consulting engineers and designers preparing rehabilitation specifications and tender documents.

Related standards and cross‑references

• ISO 11297‑1: General requirements for renovation of underground drainage and sewerage networks under pressure.
• ISO 11296 series, ISO 11298, ISO 11299: Other renovation system standards for different network types and techniques.
• ISO 4427‑1:2007, Annex A - referenced for applications with constant operating temperatures >20 °C and up to 40 °C.

Using ISO 11297-3:2018 helps ensure safe, durable and verifiable close‑fit PE lining solutions for pressurised sewer and drainage rehabilitation projects.