ISO 11298-2:2018

Overview

ISO 11298-2:2018 - "Plastics piping systems for renovation of underground water supply networks - Part 2: Lining with continuous pipes" specifies requirements and test methods for polyethylene (PE) pipes, fittings and assemblies used as continuous liners in the renovation (rehabilitation) of underground water supply networks. It is intended to be read in conjunction with ISO 11298-1 (Part 1: General) and applies primarily with a reference operating temperature of 20 °C. The standard covers material, construction, jointing and installation considerations specific to continuous pipe lining techniques for trenchless renovation.

Key topics and technical requirements

• Scope of materials: Accepts PE pipes in three forms:
  • Solid wall single-layered PE pipes (including identification stripes).
  • Co‑extruded layered PE pipes (layers on inside/outside where all layers share the same MRS rating; see Annex A).
  • PE coated pipes with a peelable contiguous thermoplastic outer layer ("coated pipe").
• Performance basis: Components are specified “as manufactured” and require verification in the “as-installed” condition after site processing to ensure fitness for purpose.
• Jointing methods: Covers butt fusion jointing of pipe lengths and references electrofusion equipment standards where relevant.
• Fittings: Includes requirements for fabricated and injection‑moulded PE fittings used with continuous liners.
• Design and verification: Geometrical, mechanical and physical characteristics must conform with relevant PE water-supply standards; any non‑standard diameter/thickness combinations must be validated by design calculations.
• Installation and quality control: Addresses preparatory work, storage/handling, equipment (butt-fusion and electrofusion machines, rollers, winching/pulling, entry guides, inspection and lifting equipment), process-related inspection/testing, lining termination, reconnection, final inspection and documentation.
• Reference conditions: Designed for use at 20 °C; for continuous operation up to 40 °C, see ISO 4427 guidance.

Applications and users

• Practical use: Trenchless rehabilitation of potable water mains by installing continuous PE liners to restore hydraulic capacity, mechanical integrity and corrosion resistance.
• Primary users:
  • Utility owners and municipal water authorities
  • Design and consulting engineers specifying rehab systems
  • Trenchless contractors and installation teams
  • PE pipe and fittings manufacturers
  • Test laboratories and conformity assessors
  • Regulators and asset managers developing specifications
• Benefits: Provides standardized requirements for material selection, jointing, and installation practice that support reliable long-term performance of renovated underground water supply networks.

Related standards

• ISO 11298-1 (Part 1: General)
• ISO 4427 series (PE pipes and fittings for water supply)
• ISO 12176-1 / -2 (Butt fusion and electrofusion equipment)
• EN 12201 series (related PE water supply standards)

Keywords: ISO 11298-2:2018, plastics piping systems, renovation, underground water supply networks, PE pipes, continuous lining, butt fusion, electrofusion, trenchless rehabilitation, MRS.