Overview
SIST EN ISO 11298-4:2021 outlines requirements and test methods for plastics piping systems used in the renovation of underground water supply networks, focusing specifically on lining with cured-in-place pipes (CIPP). Developed by SIST in conjunction with ISO 11298-1, this standard applies to the rehabilitation of pipelines transporting water intended for human consumption, including raw water intake lines.
The standard covers CIPP pressure liners classified as structural (Class A) and semi-structural (Class B) according to ISO 11295, which do not depend on adhesion to the existing pipeline. It prescribes the use of various thermosetting resin systems in combination with suitable fibrous carrier materials, reinforcements, and process-related plastic components. This standard is vital for ensuring reliable, safe, and effective renovation of underground water pipelines.
Key Topics
- Scope of Application: Applies to CIPP renovation methods for water supply pipelines, designed for service temperatures up to 25°C.
- Material Requirements: Specifies requirements for lining tube components including resin systems (such as unsaturated polyester, epoxy, or vinyl ester resins), carrier materials, reinforcements, and internal/external membranes.
- Product Classifications: Defines fully structural (independent) and semi-structural (interactive) liner types based on structural dependency with the host pipe.
- Test Methods: Specifies procedures to assess physical, mechanical, and geometric properties of CIPP systems both as manufactured and after installation.
- Installation Procedures: Covers preparatory work, storage, transport, installation techniques (such as inversion and winched-in-place), and process-related inspection.
- Performance and Fitness for Purpose: Establishes requirements for in-situ performance, including leak tightness and pressure resistance.
Applications
This standard is integral for the renovation of underground water supply networks in urban and rural infrastructure projects. Specific applications include:
- Water Utility Rehabilitation Projects: Used by utilities to restore aging or failing pipes without the need for extensive excavation, minimizing service disruption and environmental impact.
- Municipal Infrastructure Renewal: Ensures compliance in public works for maintaining safe potable water transport systems.
- Contractor Project Specification: Provides contractors and engineering professionals with recognized methods for selecting appropriate CIPP materials and installation practices.
- Quality Assurance and Regulatory Compliance: Enables water authorities and regulators to verify that renovated pipelines meet health and safety standards for water intended for human consumption.
- Sustainable Pipeline Remediation: Supports more sustainable maintenance by reducing the need for total pipe replacement and facilitating faster project completion.
Related Standards
Professionals referring to SIST EN ISO 11298-4:2021 may also find the following standards relevant:
- ISO 11298-1: General requirements for plastics piping systems used for renovation of underground water supply networks.
- ISO 11295: Classification and guidelines for the design and application of plastics piping systems for renovation and replacement.
- ISO 178: Methods for determining the flexural properties of plastics.
- ISO 10639: Specifications for glass-reinforced thermosetting plastics systems for water supply.
- ISO 11296 and ISO 11297: Related standards for the renovation of non-pressure and pressure underground sewerage networks.
- ISO 10928, ISO 8513, ISO 8521: Test methods and analysis for plastic piping system components.
Practical Value
Implementing SIST EN ISO 11298-4:2021 ensures long-term reliability, leak tightness, and structural capability of renovated water pipelines through rigorous requirements and standardized testing. By adhering to this standard, stakeholders can deliver safer water supply services, extend the life of existing infrastructure, and align with best practices in water industry pipeline rehabilitation.
Keywords: plastics piping systems, CIPP, cured-in-place pipes, underground water supply networks, pipeline renovation, ISO 11298-4, structural liners, water infrastructure rehabilitation, thermosetting resin systems, pipeline standards.