Overview
CEN ISO/TR 27165:2012 is a Technical Report that provides standardized guidance for definitions of wall constructions in thermoplastics piping systems. It primarily targets thermoplastics pipes used in both pressure and non-pressure applications. The document consolidates and harmonizes existing definitions found in published product standards, aiming to create a unified language for industry professionals when drafting new standards or revising current ones.
Developed by CEN/TC 155 in collaboration with ISO/TC 138/SC 2, this guidance is crucial for manufacturers, designers, and regulatory bodies involved in plastic pipe systems, ensuring consistency in terminology related to pipe wall structures.
Key Topics
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Wall Construction Definitions
The report clarifies terms related to different pipe wall types such as:
- Solid wall pipes: Made from one or more compounds with consistent mechanical ratings.
- Multilayer pipes: Comprised of two or more layers with different materials or functions, including polymeric and metallic layers.
- Structured wall pipes: Featuring profiled outer layers, foamed, or hollow intermediate layers for enhanced performance.
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Material and Layer Types
Detailed definitions cover materials used, including:
- Base polymers and compounds.
- Functional layers for mechanical strength or special purposes (e.g., oxygen barriers, UV resistance).
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Coated Pipes
Definitions include coated pipes with peelable external layers intended for pipe protection during handling.
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Special Pipe Constructions
- Double wall piping systems: Comprising primary and secondary pipes separated by an interstitial space for leakage detection and environmental protection.
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Dimension Ratio Definitions
Standard dimension ratios for metallic and polymeric layers ensure uniform evaluation of pipe wall thickness relative to diameter.
Applications
CEN ISO/TR 27165:2012 serves multiple practical applications in the thermoplastics piping industry:
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Standardization of Product Development
By providing clear terminology, manufacturers can ensure their pipes meet common expectations and regulatory requirements.
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Design and Engineering
Engineers use the uniform definitions for selecting appropriate pipe types and constructions based on application needs, such as pressure containment or chemical resistance.
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Quality Assurance & Compliance
Regulatory and certification bodies refer to this standard for evaluating product conformity and safety, especially for critical water, sewage, and industrial fluid transport systems.
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Technical Documentation & Communication
Enables uniform language in technical manuals, contracts, and marketing materials, reducing ambiguity during international projects.
Related Standards
- ISO 472:1999 – Plastics Vocabulary, providing fundamental definitions relevant to plastics materials.
- ISO 1043-1:2011 – Plastics Symbols and Abbreviated Terms, defining polymer types and characteristics.
- Other CEN and ISO product standards for thermoplastic pipes, fittings, and valves establishing performance criteria often referencing terminology from ISO/TR 27165.
By adopting CEN ISO/TR 27165:2012, stakeholders in thermoplastics piping systems benefit from enhanced clarity, improved interoperability, and reinforced safety across pressure and non-pressure applications worldwide. This technical report is foundational for ensuring high standards in plastic pipe manufacturing, testing, and utilization.