ISO 11297-4:2018

Overview

ISO 11297-4:2018 defines requirements and test methods for cured-in-place pipes (CIPP) used to renovate hydraulically and pneumatically pressurized underground drainage and sewerage networks (service temperatures up to 50 °C). Applied together with ISO 11297‑1 and ISO 11296‑4, this part covers CIPP liners that are either independent (fully structural, class A) or interactive (semi-structural, class B) and that do not rely on adhesion to the host pipe. The standard addresses materials (thermosetting resin systems combined with fibrous carriers and reinforcements), manufacturing and installation stages, and in-service performance verification. It explicitly excludes requirements for resistance to abrasion, cyclic loading or impact.

Key topics and technical requirements

• Materials and components: Use of various thermosetting resins, compatible fibrous carrier materials, reinforcements and process-related plastics components (see clause 5.1).
• Product stages: Requirements are given for the pipe/fitting at the “M” stage (manufactured) and for fitness-for-purpose at the “I” stage (installed).
• Mechanical & physical characteristics: Test methods and performance metrics include flexural properties, ring/stiffness, long-term pressure performance (e.g., projected failure pressure at 50 years and minimum failure pressure at 50 years), and other material characteristics specified for installed liners.
• Geometric requirements: Wall structure and minimum thickness criteria for CIPP constructions.
• Leak tightness & terminations: Requirements for termination integrity and reconnections to existing pipelines.
• Testing, sampling & inspection: Protocols for sampling, process-related inspection, final inspection and documentation to verify as-installed performance.
• Installation practice: Guidance on preparatory work, storage/handling, equipment, installation, reconnections, and final testing.

Applications and who uses this standard

ISO 11297-4:2018 is intended for stakeholders involved in pressure sewer and drainage rehabilitation:

• CIPP manufacturers and material suppliers (resins, carriers, reinforcement)
• Rehabilitation contractors and installation specialists
• Design and consulting engineers specifying trenchless renovation solutions
• Testing laboratories performing long-term pressure and material tests
• Asset owners, utilities and regulators seeking standardized acceptance criteria Practical benefits include consistent product specification, verified in-situ performance, and clarity on acceptable materials and test methods for CIPP pressure liners.

Related standards

• ISO 11297-1:2018 - General requirements for renovation piping systems under pressure
• ISO 11296-4:2018 - CIPP for non-pressure drainage networks
• ISO 11295:2017 - Classification and design information for renovation piping systems
• Other referenced test standards (e.g., ISO 7509, ISO 10928) cover long-term pressure and regression analysis methods.

Keywords: ISO 11297-4:2018, CIPP, cured-in-place pipes, plastics piping systems, renovation, underground drainage, sewerage, pressure liners, thermosetting resin.