ISO 11296-7:2019

Overview - ISO 11296-7:2019 (Spirally-wound pipes)

ISO 11296-7:2019 is the ISO system standard part that specifies requirements and test methods for lining with spirally-wound pipes used in the renovation of underground non-pressure drainage and sewerage networks. Meant to be applied together with ISO 11296-1 (General), this part covers pipes formed on site by spirally winding a pre-manufactured profiled plastics strip (PVC‑U with integral locking or HDPE with welded joints), including options with steel stiffening elements, and addresses both fixed and variable diameter installations.

Key topics and technical requirements

• Scope and materials: Requirements for profiled plastics strips (PVC‑U or HDPE), seam materials and permissible stiffening elements.
• Geometric, mechanical and physical characteristics: Specifications and test methods for dimensions, ring stiffness, tensile behaviour of seams and other performance metrics in both “as manufactured” (M) and “as-installed” (I) stages.
• Jointing and sealing: Integral locking mechanisms, seam sealants, welds and associated testing for seam integrity and watertightness (including a normative test for watertightness in a deflected condition - Annex A).
• Installation methods: Two approved onsite winding methods - (1) winding at the open pipeline end (e.g., manhole) with simultaneous insertion and optional expansion, and (2) in-line traverse winding from manhole to manhole.
• Installation practice and inspection: Preparatory work, storage/handling, equipment, process-related inspection and testing, lining termination, reconnection of laterals/manholes (examples in Annex B), final inspection, documentation and sample preparation.
• Referenced tests & standards: Uses established test methods such as ring stiffness and tensile testing (normative references include ISO 9969, ISO 13262, ISO 10467, etc.).

Practical applications

• Rehabilitation of sewer and stormwater pipes where non-pressure flow predominates.
• Onsite formation of a new internal lining to extend service life, restore hydraulics and ensure watertightness without full pipeline replacement.
• Situations requiring variable-diameter or expandable liner solutions and limited excavation (manhole‑to‑manhole rehabilitation).

Who should use this standard

• Pipeline rehabilitation contractors and installers
• Manufacturers of profiled plastics strips and spirally‑wound lining systems
• Design engineers, consulting and civil engineers specifying lining systems
• Asset owners, utilities and sewer network operators, inspectors and certification bodies

Related standards

• ISO 11296-1: General requirements for renovation systems
• Other ISO 11296 parts (continuous pipes, cured-in-place, discrete pipes, etc.)
• ISO 9969 (ring stiffness), ISO 13262 (seam tensile testing), ISO 10467 (GRP fittings)

This standard is essential for anyone specifying, producing, installing or certifying spirally-wound plastic linings for underground non-pressure drainage and sewerage rehabilitation.