Unplasticized polyamide (PA-U) pipes — Effect of time and temperature on the expected strength

This document specifies the minimum values for expected strength as a function of time and temperature in the form of reference lines, for use in calculations on unplasticized polyamide (PA-U 180) extruded pipes. NOTE 1 PA-U 180 follows ISO 16486-1 in terms of minimum strength values and covers both PA-U11 180 and PA-U12 180. NOTE 2 As there is not test data available for other types of polyamide (e.g. PA-U 160) this document does not currently contain appropriate reference lines for these materials. Future revisions will include other types of polyamide when sufficient test data becomes available.

Tubes en polyamide non plastifié (PA-U) — Influence du temps et de la température sur la résistance attendue

General Information

Status
Published
Publication Date
30-Apr-2025
Current Stage
6060 - International Standard published
Start Date
01-May-2025
Due Date
12-Jan-2026
Completion Date
01-May-2025
Ref Project

Buy Standard

Standard
ISO 8149:2025 - Unplasticized polyamide (PA-U) pipes — Effect of time and temperature on the expected strength Released:1. 05. 2025
English language
7 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)


International
Standard
ISO 8149
First edition
Unplasticized polyamide (PA-
2025-05
U) pipes — Effect of time and
temperature on the expected
strength
Tubes en polyamide non plastifié (PA-U) — Influence du temps et
de la température sur la résistance attendue
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic formulae . 2
5 Expected strength . 2
5.1 General .2
5.2 Extrapolation limits .3
5.3 Graphical representation .3
5.4 Tabulated value .5
6 Demonstrating conformity . 5
Annex A (normative) Demonstrating conformance to the reference lines . 6
Bibliography . 7

iii
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plastic materials and
their accessories —Test methods and basic specifications.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
The first pressure piping system made of PA-U was installed as a pilot for buried gas pipes in the early
2000s. This was followed by a comprehensive number of special case installations based on different PA-U
compounds. Due to commercial applications for buried gas pipes, there is a demand for further pressure
pipe applications, which lay on ground (like oil field piping systems) or which are installed above ground
in supports (like industrial piping systems inside or outside of gas infrastructure). Using thermoplastic
piping materials instead of metallic materials (e.g. steel or cast iron) has proven successful over the last
50 years. But for many thermoplastic pipe applications, the use has been limited to a maximum operation
1)
pressure of 10 bar for buried gas piping systems or approximately 7 bar for low temperature above ground
installations. Due to their high strength, PA-U 180 compounds extend the range for operation pressures for
thermoplastic pressure piping systems with the target of replacing the use of metal-based systems.
With the market availability of PA-U 180 compounds, the option for the use of plastics materials, instead of
metallic materials, for pipes, fittings and valves, became possible for high pressure applications. As a result,
products mainly produced by extrusion and injection molding have been introduced into the market.
In the beginning, the design and the calculation for the dimensioning was based on individual ISO 9080
analyses for each individual PA-U 180 compound. The approach behind the development of this document
is the intention to align the values for the expected strength over the time (reference lines) for PA-U 180, in
order to simplify and unify all design procedures for which the expected strength over the time is needed.
At the date of publication of this document, the following International Standards dealing with PA-U pressure
piping systems had been published:
— ISO 16486 series, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)
piping systems with fusion jointing and mechanical jointing
NOTE Further information can be found in the Bibliography, notably in References [6], [7], [8],[ 9], [10], [11], [12],
[13], [14], [15], [16] and [17].
5 2
1)  1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .

v
International Standard ISO 8149:2025(en)
Unplasticized polyamide (PA-U) pipes — Effect of time and
temperature on the expected strength
1 Scope
This document specifies the minimum values for expected strength as a function of time and temperature
in the form of reference lines, for use in calculations on unplasticized polyamide (PA-U 180) extruded pipes.
NOTE 1 PA-U 180 follows ISO 16486-1 in terms of minimum strength values and covers both PA-U11 180 and PA-
U12 180.
NOTE 2 As there is not test data available for other types of polyamide (e.g. PA-U 160) this document does not
currently contain appropriate reference lines for these materials. Future revisions will include other types of
polyamide when sufficient test data becomes available.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to internal pressure — Part 1: General method
ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to intern
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.