ISO 11295:2022

Overview

ISO 11295:2022 - Plastics piping systems used for the rehabilitation of pipelines provides a structured, high‑level framework for planning and executing pipeline rehabilitation works using plastics piping systems. The standard covers the whole rehabilitation process - from strategic and tactical activities (investigation, condition assessment, and rehabilitation planning) through operational activities (project specification, technique application, and documentation). It classifies families of renovation and trenchless replacement techniques and describes their key features for underground drainage, sewerage, water and gas supply networks.

Key topics and technical requirements

• Pipeline rehabilitation process: A stepwise overview linking strategy, tactics and operations to ensure consistent rehabilitation decisions.
• Investigation & condition assessment: Guidance on performance criteria (hydraulic, structural, environmental, operational), investigation methods, condition assessment, risk analysis and control measures.
• Classification of techniques: Definitions and characteristics of renovation techniques (e.g., continuous pipes, close‑fit pipes, cured‑in‑place liners, spirally‑wound pipes, sprayed polymeric materials, pipe segments) and trenchless replacement methods (pipe bursting, pipe removal, HDD, impact moling, pipe jacking).
• Selection criteria: Considerations for hydraulic and structural performance, system layout, environmental impact and construction constraints when selecting rehabilitation techniques.
• Implementation & quality control: Preconstruction activities, product conformity assessment, handling and storage, construction steps, acceptance control (inspection, leak tightness testing, sampling), completion and documentation.
• Scope limitations: The standard explicitly excludes new construction as network extensions, calculation methods for determining lining/replacement material characteristics, non‑structural pressure pipe liners and techniques for local repair.

Practical applications - who uses ISO 11295:2022

• Network owners and utility asset managers using ISO 11295 for prioritizing rehabilitation and aligning with asset management practices.
• Designers and consulting engineers when specifying plastics‑based renovation or trenchless replacement systems.
• Contractors and installers for guidance on implementation, inspection and acceptance testing of rehabilitation works.
• Spec writers and procurement teams preparing project specifications and tender documents for sewer, drainage, water and gas pipeline rehabilitation.
• Regulators and municipal engineers assessing compliance and lifecycle planning for underground infrastructure.

Related standards

• ISO 55000 / ISO 55001 / ISO 55002 (asset management) - for overarching asset management context.
• ISO 24516 series - guidance on management of water and wastewater networks.
• Developed in collaboration with CEN (CEN/TC 155).

ISO 11295:2022 is essential for stakeholders specifying or delivering plastics piping rehabilitation projects, especially where trenchless methods and systematic condition‑based planning are required. Keywords: ISO 11295:2022, pipeline rehabilitation, plastics piping systems, trenchless replacement, cured‑in‑place, pipe bursting, condition assessment.