ISO 11297-2:2018

Overview

ISO 11297-2:2018 - "Plastics piping systems for renovation of underground drainage and sewerage networks under pressure - Part 2: Lining with continuous pipes" - specifies requirements and test methods for polyethylene (PE) pipes and fittings used as continuous pipe linings in the rehabilitation of pressurised drainage and sewerage networks. It is intended to be used together with ISO 11297‑1 (General) and focuses on materials, jointing, installation, inspection and the “as‑installed” verification that is critical for renovation works.

Key topics and technical requirements

• Scope and materials
  • Applies to PE pipes of three types: solid wall single-layer, co-extruded layered pipes, and PE coated pipes with a peelable thermoplastic outer layer (see Annex A).
  • Pipe systems are specified for a reference operating temperature of 20 °C (guidance for 20–40 °C is referenced to ISO 4427‑1).
• Design and properties
  • Material, geometric, mechanical and physical characteristics are aligned with ISO 4427 series requirements.
  • MRS (minimum required strength), melt mass-flow rate (MFR), oxidation induction time (OIT) and other material indicators are covered by referenced standards.
• Jointing and fittings
  • Butt fusion is the defined method for jointing continuous pipe lengths; electrofusion equipment and practices are referenced where applicable.
  • Covers fabricated and injection‑moulded PE fittings used in lining assemblies.
• Installation, inspection and testing
  • Requirements for preparatory work, storage, handling, equipment (fusion gear, rollers, winching, entry guides), process‑related inspection and “fitness for purpose” testing of the system as installed.
  • Final inspection, testing, documentation and reconnection procedures are specified.
• Normative content
  • Annex A is normative and covers layered and coated pipe specifics.

Applications

• Rehabilitation and relining of underground drainage and sewerage networks under pressure using continuous PE pipe linings.
• Typical use cases: municipal sewer mains, pressured service laterals, and sewer segments requiring trenchless renovation where continuous lining is preferred.

Who should use this standard

• Pipeline engineers, rehabilitation contractors and installers
• PE pipe and fittings manufacturers
• Asset owners, utilities and municipal authorities
• Design consultants, compliance officers and testing laboratories

Related standards

• ISO 11297‑1 (General for renovation systems)
• ISO 4427 series (PE pipes and fittings for water supply)
• ISO 12176 (fusion equipment)
• EN 12201 series (related PE piping standards)

Keywords: ISO 11297-2:2018, plastics piping systems, renovation, underground drainage, sewerage networks under pressure, PE pipes, lining with continuous pipes, butt fusion, co-extruded pipes, coated pipe, pipeline rehabilitation.