Overview
ISO/TS 21003-7:2019 provides requirements and guidance for the assessment of conformity of compounds, products and assemblies used in multilayer piping systems for hot and cold water installations inside buildings. It is intended to be included in a manufacturer’s quality plan and to support the establishment of certification procedures. The Technical Specification applies to domestic and heating systems conveying water (whether or not for human consumption) at design pressures and temperatures appropriate to the application class (see ISO 21003‑1).
Key topics and requirements
- Scope and applicability: Conformity assessment guidance for multilayer piping systems (pipes, fittings, joints, assemblies) used inside buildings.
- Integration with QMS: Requirements for inclusion of conformity activities in the manufacturer’s quality management system and quality plan (links to ISO 9001 principles).
- Testing framework: Detailed guidance on types of tests used for certification and control, including:
- Type testing (TT) to demonstrate product capability
- Batch release tests (BRT) before releasing production batches
- Process verification tests (PVT) for routine process control
- Audit tests (AT) performed by inspection/certification bodies
- Indirect testing (IT) and Witness testing (WT)
- Grouping and sampling: Grouping by pressure, size and fitting types for efficient testing strategies; sampling plans and record-keeping requirements.
- Material and sourcing: Definitions and guidance for material, material grade, compound and handling of alternative material grades (second sourcing) - reflected in Annex A.
- Roles and conformity bodies: Expectations for competent certification bodies, inspection bodies, and testing laboratories (references to ISO/IEC 17065, ISO/IEC 17020, ISO/IEC 17025 where relevant).
Applications and users
- Manufacturers of multilayer pipes, fittings and assembled products - to implement compliant quality plans and production control.
- Certification bodies and national standards organizations - to develop third‑party certification procedures.
- Testing laboratories and inspection bodies - to apply standardized testing protocols and audit methods.
- Specifiers, plumbing engineers, building services designers and regulators - to understand conformity routes and verify that products meet system‑standard requirements.
- Contractors and installers - to ensure installed components are certified and compatible with system classes.
Related standards
Keywords: ISO/TS 21003-7:2019, multilayer piping systems, assessment of conformity, type testing, batch release, process verification tests, certification procedures, hot and cold water installations.