EN ISO 11296-4:2018/A1:2021 PDF

Overview

EN ISO 11296-4:2018/A1:2021 is Amendment 1 to Part 4 of the ISO 11296 series: Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Lining with cured-in-place pipes (CIPP). Published by CEN in 2021, this amendment updates definitions, marking requirements and introduces a procedure for an alternative expression of flexural test results for cured-in-place pipe systems used in non-pressure sewer and drainage renovation.

Key topics and technical requirements

• Updated terms and definitions: New and revised definitions clarify terminology used in CIPP manufacture and installation, such as carrier material, CIPP product, CIPP unit, and nominal CIPP “M” and “I” stage wall thicknesses (symbols e_n,M and e_n,I).
• Marking and thickness requirements: The amendment specifies how manufacturers may mark lining tubes with either nominal “M”‑stage or “I”‑stage wall thickness and how those thicknesses must be measured/documented. It emphasizes deduction of membranes from measured thickness and explains that I‑stage thickness reflects the minimum mean composite thickness after installation.
• Alternative expression of flexural results: Where mean composite thickness or apparent flexural modulus is uncertain (e.g., structured-wall liners, membrane layers, excess resin), flexural characteristics can be expressed as section bending stiffness (EI) and section moment capacity (M) per unit length. Annex B provides the procedure and formula references (e.g., Formulae B.12 and B.13) for deriving EI and M from 3‑point bending tests on flat and curved specimens.
• Normative references updated: The amendment updates referenced test standards to current editions, including ISO 178:2019 (flexural properties), ISO 7685:2019 (initial ring stiffness for GRP), ISO 10467:2018 (GRP systems), ISO 10468, and ISO 14125:1998.

Practical applications and users

This amendment is intended for professionals involved in the specification, manufacture, testing and installation of CIPP systems:

• Manufacturers: to ensure marking, wall‑thickness declarations and quality-plan measurement methods comply with the standard.
• Testing laboratories: to apply the updated flexural test expression (EI, M) and current referenced test methods.
• Design engineers and specifiers: to select appropriate CIPP products and interpret declared M/I stage thicknesses and structural parameters for rehabilitation projects.
• Asset owners / contractors: to verify product conformity, installation claims and performance data for non‑pressure drainage and sewer networks.

Related standards

• ISO 11296-1:2018 (general requirements for plastics piping renovation systems)
• ISO 178:2019 (determination of flexural properties)
• ISO 10467:2018 and ISO 10468 (GRP systems and ring creep)
• ISO 14125:1998 (flexural properties of fibre‑reinforced composites)

Keywords: EN ISO 11296-4:2018/A1:2021, CIPP, cured-in-place pipe, lining, non-pressure drainage, sewer renovation, flexural test, marking requirements, plastics piping systems.