ISO/TR 27165:2012

Thermoplastics piping systems - Guidance for definitions of wall constructions for pipes

ISO/TR 27165:2012 provides definitions for wall constructions of thermoplastics pipes intended to be used in pressure and non-pressure pipe applications. It takes into account as far as possible already existing definitions in published product standards and gives guidance for a common text when drafting new deliverables or revising existing ones.

Systèmes de canalisations thermoplastiques — Lignes directrices pour les définitions relatives à la construction des parois de tubes

General Information

• Status: Published
• Publication Date: 02-Oct-2012
• ICS: 23.040.20 - Plastics pipes
• ICS: 91.140.60 - Water supply systems
• Technical Committee: ISO/TC 138/SC 2 - Plastics pipes and fittings for water supplies
• Drafting Committee: ISO/TC 138/SC 2 - Plastics pipes and fittings for water supplies
• Current Stage: 9093 - International Standard confirmed
• Start Date: 12-Jul-2022
• Completion Date: 14-Feb-2026

Relations

• Consolidates: CEN ISO/TR 27165:2012 - Thermoplastics piping systems - Guidance for definitions of wall constructions for pipes (ISO/TR 27165:2012)
• Effective Date: 12-Feb-2026

Overview

ISO/TR 27165:2012 provides essential guidance on the definitions of wall constructions for thermoplastics pipes used in both pressure and non-pressure piping systems. Developed by the International Organization for Standardization (ISO), this technical report addresses the need for standardized terminology in the rapidly evolving field of plastic piping systems. By consolidating definitions from existing product standards and offering a framework for the drafting and revision of new deliverables, ISO/TR 27165:2012 ensures consistency, clarity, and reliability in specifying and manufacturing thermoplastics pipes.

Key Topics

• Materials and Compounds: Clarifies terminology concerning thermoplastics materials and compounds, establishing a common language for formulations and compositions.
• Pipe Wall Constructions: Defines categories and subcategories, including:
  • Coated Pipes - Pipes with removable outer protection.
  • Solid Wall Pipes - Either single or multilayered pipes with unified material properties.
  • Multilayer Pipes - Pipes comprised of different materials/layers for enhanced performance.
  • Structured Wall Pipes - Pipes with specialized constructions for improved structural capabilities.
  • Double Wall Piping Systems - Pipes with integrated secondary containment for leak prevention.
• Layer Functions: Explains the utility of each layer in pipe construction (e.g., stress/strain design, specific function such as permeability barriers or UV resistance).
• Dimensional Ratios: Introduces standard measurements like the nominal outside diameter to wall thickness ratios for both metallic and polymeric layers.

Applications

ISO/TR 27165:2012 is highly beneficial across several sectors where thermoplastic pipes are specified, manufactured, or installed:

• Product Standardization: Manufacturers and standardization committees can use the unified terminology and definitions when drafting or revising product standards, ensuring interoperability and market alignment.
• Pressure and Non-Pressure Pipe Systems: Relevant in water supply, wastewater, gas distribution, and industrial applications where diverse wall constructions influence performance.
• Quality Assurance & Inspection: Offers a reference for quality control processes, facilitating consistent evaluation of pipe wall construction during production and installation.
• Regulatory Compliance: Assists in meeting international compliance requirements when referencing definitions for product certification or market entry.
• Technical Training: Aids in the education and training of engineers, designers, and installers to ensure accurate understanding of pipe wall constructions, thereby reducing errors and improving system reliability.

Related Standards

Professionals working with ISO/TR 27165:2012 should also be familiar with the following related international standards:

• ISO 472:1999 - Plastics - Vocabulary: A comprehensive glossary of terms used in the plastics industry, referenced for baseline definitions.
• ISO 1043-1:2011 - Plastics - Symbols and abbreviated terms - Part 1: Basic polymers and their special characteristics: Provides standardized symbols for polymers, facilitating communication and documentation.
• Other Relevant Pipe Standards: Depending on application context, consulting additional standards for specific thermoplastics pipe types or installation practices may be necessary.

Practical Value

By using the definitions and guidance provided by ISO/TR 27165:2012, stakeholders in the plastics piping systems industry can:

• Encourage effective communication across international teams and supply chains
• Avoid ambiguities in technical documentation and product labeling
• Streamline the process of updating existing standards or developing new ones in line with international best practices
• Facilitate innovation by providing a clear framework for new wall constructions within the recognized categories

For anyone involved in the design, manufacture, specification, or regulation of thermoplastics piping systems, ISO/TR 27165:2012 is an indispensable reference for achieving precision and clarity in defining wall constructions for pipes.

Standards Content (Sample)

TECHNICAL ISO/TR
REPORT 27165
First edition
2012-10-15
Thermoplastics piping systems —
Guidance for definitions of wall
constructions for pipes
Systèmes de canalisations thermoplastiques — Lignes directrices pour
les définitions relatives à la construction des parois de tubes
Reference number
©
ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

Contents Page
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Materials . 1
3.2 Coated pipes . 1
3.3 Solid wall pipes . 2
3.4 Multilayer pipes . 2
3.5 Structured wall pipes . 3
3.6 Double wall piping system . 3
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
In exceptional circumstances, when a technical committee has collected data of a different kind from that
which is normally published as an International Standard (“state of the art”, for example), it may decide by a
simple majority vote of its participating members to publish a Technical Report. A Technical Report is entirely
informative in nature and does not have to be reviewed until the data it provides are considered to be no longer
valid or useful.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TR 27165 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 2, Plastics pipes and fittings for water supplies, in collaboration with
Technical Committee CEN/TC 155, Plastics piping systems and ducting systems.
iv © ISO 2012 – All rights reserved

Introduction
For thermoplastics piping systems used in pressure and non-pressure applications, there are different wall
constructions on the market.
Existing definitions in product standards can vary from those as given in this document.
Regarding new developments in this sector, CEN/TC 155 and ISO/TC 138/SC 2 felt it necessary to establish
common definitions for wall constructions of pipes to be referenced in a uniform way in product standards.
TECHNICAL REPORT ISO/TR 27165:2012(E)
Thermoplastics piping systems — Guidance for definitions of
wall constructions for pipes
1 Scope
This Technical Report provides definitions for wall constructions of thermoplastics pipes intended to be used in
pressure and non-pressure pipe applications. It takes into account as far as possible already existing definitions
in published product standards and gives guidance for a common text when drafting new deliverables or
revising existing ones.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applie
...