ISO 11296-3:2018

Overview

ISO 11296-3:2018 - Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 3: Lining with close-fit pipes - specifies requirements and test methods for close-fit lining systems used in trenchless rehabilitation of sewers and non-pressure drainage. Designed to be used together with ISO 11296‑1 (General), this part applies to pipes and fittings made of polyethylene (PE) or unplasticized poly(vinyl chloride) (PVC‑U), covering both the product “as manufactured” (M stage) and the installed lining system “as installed” (I stage), including associated joints.

Key Topics and Requirements

• Materials and product stages: Requirements for PE and PVC‑U raw materials, including distinctions between virgin, reprocessable and recyclable materials.
• Product characteristics: Specifications for appearance, colour, geometric, mechanical and physical characteristics for pipes and fittings at M and I stages.
• Jointing and fittings: Standards for joints used in close-fit lining systems and requirements for associated fittings and ancillary components.
• Installation practice: Guidance on preparatory work, storage, handling, equipment (butt fusion, reduction, reforming, electrofusion, inspection tools), lining insertion, termination and reconnection to manholes/laterals.
• Testing and inspection: Test methods and acceptance criteria for factory and on-site testing, sampling, final inspection and documentation - verifying fitness for purpose after site processing.
• Normative methods referenced: Uses established test standards (for example ISO 527‑2, ISO 3126 and others) for tensile, dimensional and thermal properties.
• Special procedures: Includes annexed method for determining memory ability of factory-folded heat-reverted PE pipe.

Applications

• Sewer and drainage renovation: Close-fit (tight-fit) relining of gravity sewers, house connections and non-pressure drains where a new close-fitting plastic liner is required.
• Trenchless rehabilitation projects: Municipal sewer upgrades, stormwater system rehabilitation and restoration where excavation is restricted or undesirable.
• Quality assurance & procurement: Specifies acceptance criteria for manufacturers, contractors and owners to include in technical specifications, contracts and compliance testing.

Who Should Use This Standard

• Civil and municipal engineers specifying sewer rehabilitation works
• Manufacturers of PE and PVC‑U close-fit lining systems and fittings
• Installation contractors and trenchless rehabilitation specialists
• Test laboratories, certifiers and utility asset managers
• Procurement teams writing technical specifications for sewer relining

Related Standards

• ISO 11296‑1 (General requirements for renovation systems)
• Other parts of ISO 11296 series (e.g., Parts 2, 4, 5, 7, 8) covering alternative lining techniques
• Referenced test standards (e.g., ISO 527‑2, ISO 3126) for material and component testing

Keywords: ISO 11296-3, close-fit lining, sewer rehabilitation, trenchless technology, PE lining, PVC‑U lining, non-pressure drainage, lining systems, installation practice, test methods.