CEN ISO/TS 21003-7:2019 - Multilayer piping systems for hot and cold water installations inside buildings
Part 7: Guidance for the assessment of conformity (ISO/TS 21003-7:2019)
Overview
CEN ISO/TS 21003-7:2019 provides requirements and guidance for the assessment of conformity of compounds, products and assemblies for multilayer piping systems used in hot and cold water installations inside buildings. It is intended to be used as part of a manufacturer’s quality management system (QMS) and to support the establishment of third‑party certification procedures. The scope covers domestic and heating systems for the conveyance of water under the design pressures and temperatures defined in ISO 21003‑1.
Key Topics
- Assessment of conformity: Framework for integrating conformity activities into the manufacturer’s quality plan and certification schemes.
- Testing and inspection: Detailed guidance on type testing (TT), batch release tests (BRT), process verification tests (PVT), audit tests (AT) and indirect testing (IT).
- Grouping & sampling: Principles for grouping by pressure classes, sizes and fittings to optimise testing scope.
- Test records and documentation: Requirements for maintaining test results and traceability.
- Interchangeability / second sourcing: Annex A addresses testing methods for evaluating alternative material grades (interchangeability) for layers in multilayer M‑pipes.
- Terminology updates: Revised definitions for “material”, “material grade” and “compound”, and technical updates to type testing procedures (Clause 6.2).
Applications & Who Uses It
- Manufacturers of multilayer pipes, fittings, joints and assemblies - to design compliant QMS procedures and sampling plans.
- Certification bodies and third‑party assessors - to develop certification schemes and perform conformity assessments.
- Testing laboratories - for guidance on required test types, sampling frequency and record keeping.
- Specifiers, engineers and regulators - to verify that products meet system standard requirements for in‑building hot and cold water and heating installations.
Practical use cases include product type approval, routine production control (batch release), supplier qualification (second sourcing) and scope definition for certification marks.
Related Standards
- ISO 21003 series (Parts 1, 2, 3, 5) - system requirements, pipes, fittings and fitness for purpose.
- System standards for other plastics piping: ISO 15874 (PP), ISO 15875 (PE‑X), ISO 15876 (PB), ISO 15877 (PVC‑C), ISO 22391 (PE‑RT).
Referencing these standards ensures consistent test methods and harmonised conformity assessment across piping materials.
Keywords: CEN ISO/TS 21003-7:2019, multilayer piping systems, assessment of conformity, hot and cold water installations, quality management system, type testing, batch release, process verification, certification procedures.
