ISO 11298-4:2021

Overview

ISO 11298-4:2021 - "Plastics piping systems for renovation of underground water supply networks - Part 4: Lining with cured-in-place pipes" defines requirements and test methods for cured-in-place pipe (CIPP) systems used to renovate water supply networks conveying water intended for human consumption (including raw water intake lines). Used together with ISO 11298-1, this part covers materials, product characteristics and verification both “as manufactured” and “as installed” for CIPP systems that do not rely on adhesion to the host pipe. Applicable to independent (fully structural, Class A) and interactive (semi-structural, Class B) pressure liners and intended for service temperatures up to 25 °C (re-rating guidance from suppliers for higher temperatures).

Key Topics and Requirements

• Scope and applicability: Renovation of underground potable water pipelines using cured-in-place lining techniques; excludes cyclic loading resistance and pressure rating for liners in bends.
• Materials and components: Use of thermosetting resin systems with compatible fibrous carrier materials, reinforcement and process-related plastic components.
• Product stages: Requirements for components at the manufacturing (“M”) stage and verification of the installed lining (“I” stage).
• Characteristics specified:
  • Geometric (wall thickness, structure of CIPP wall)
  • Mechanical (short- and long-term flexural properties)
  • Physical (leak tightness of terminations, durability)
  • Jointing, marking and ancillary components
• Test methods and annexes: Includes normative test procedures for short- and long-term flexural properties (see Annexes B, C and D) and requirements for sampling, inspection and documentation.
• Installation practice: Preparatory work, handling, equipment, installation procedures, reconnections and final inspection/testing.

Practical Applications

• Renovation and rehabilitation of aging or damaged potable water mains using CIPP lining.
• Projects where minimal excavation and in-situ rehabilitation are required (trenchless rehabilitation of pipelines).
• Systems selection and verification for water utilities, pipeline owners and infrastructure contractors ensuring potable water safety and mechanical integrity after installation.

Who Should Use This Standard

• Manufacturers and suppliers of CIPP systems and thermosetting resins
• Design engineers and consulting firms specifying pipe-lining solutions
• Installation contractors and field supervisors for trenchless rehabilitation
• Water utility operators, asset managers and regulatory bodies assessing compliance
• Testing laboratories performing flexural and physical property verification

Related Standards

• ISO 11298-1 (General requirements for renovation systems) - to be used in conjunction with ISO 11298-4
• ISO 11295 (Definitions and classification for renovation liners)
• Other parts of ISO 11298 series covering alternative lining techniques

Keywords: ISO 11298-4:2021, CIPP, cured-in-place pipe, pipe lining standards, water supply network renovation, thermosetting resin, Class A Class B liners.