Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes

This document specifies the characteristics of pipes made from polyethylene (PE) for piping systems in the field of the supply of gaseous fuels. It also specifies the test parameters for the test methods referred to in this document. In conjunction with ISO 4437-1, ISO 4437-3, ISO 4437-4 and ISO 4437-5, this document is applicable to PE pipes, fittings and valves, their joints, and joints with components of PE and other materials intended to be used under the following conditions: a) a maximum operating pressure (MOP), up to and including 10 bar[1], at a reference temperature of 20 °C for design purposes; b) an operating temperature between −20 °C and 40 °C. For operating temperatures between 20 °C and 40 °C, derating coefficients are defined in ISO 4437-5. The ISO 4437 series covers a range of MOPs and gives requirements concerning colours. This document is applicable to three types of pipes: — PE pipes (outside diameter, dn) including any identification stripes; — PE pipes with co-extruded layers on either or both the outside and/or inside of the pipe (total outside diameter, dn) as specified in Annex A, where all PE layers have the same MRS rating; — PE pipes (outside diameter, dn) with a peelable and contiguous thermoplastics additional layer on the outside of the pipe ("coated pipe") as specified in Annex B. It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes. [1] 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.

Systèmes de canalisations en plastique pour la distribution de combustibles gazeux — Polyéthylène (PE) — Partie 2: Tubes

General Information

Status
Published
Publication Date
13-Feb-2024
Current Stage
9092 - International Standard to be revised
Completion Date
19-Sep-2024
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ISO 4437-2:2024 - Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes Released:14. 02. 2024
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International
Standard
ISO 4437-2
Second edition
Plastics piping systems for
2024-02
the supply of gaseous fuels —
Polyethylene (PE) —
Part 2:
Pipes
Systèmes de canalisations en plastique pour la distribution de
combustibles gazeux — Polyéthylène (PE) —
Partie 2: Tubes
Reference number
© ISO 2024
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 . 2
3.1 Terms related to geometry .2
3.2 Terms related to material .4
3.3 Terms related to material characteristics .4
3.4 Terms related to service conditions .5
3.5 Terms related to joints .5
4 Symbols and abbreviated terms. 6
4.1 Symbols .6
4.2 Abbreviated terms .6
5 Material. 7
5.1 Compound for pipes .7
5.2 Compound for identification stripes .7
5.3 External reworked and recycled material .7
6 General characteristics . 7
6.1 Appearance .7
6.2 Colour .7
7 Geometrical characteristics . 8
7.1 Measurement of dimensions .8
7.2 Mean outside diameters, out-of-roundness (ovality) and tolerances .8
7.3 Wall thicknesses and related tolerances .9
7.3.1 Minimum wall thicknesses.9
7.3.2 Tolerance on the wall thicknesses .10
7.4 Circumferential reversion of pipes with d equal to or greater than 250 mm . 12
n
7.5 Coiled pipe . 12
7.6 Lengths . 12
8 Mechanical characteristics .12
8.1 Conditioning. 12
8.2 Requirements . 12
9 Physical characteristics .16
9.1 Conditioning.16
9.2 Requirements .16
10 Performance requirements . .16
11 Marking . .16
11.1 General .16
11.2 Minimum required marking .17
Annex A (normative) Pipes with co-extruded layers .18
Annex B (normative) Pipes with peelable layer .20
Annex C (normative) Squeeze-off technique .22
Bibliography .23

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 4, Plastics pipes and fittings for the supply of gaseous fuels.
This second edition cancels and replaces the first edition (ISO 4437-2:2014), which has been technically
revised.
The main changes are as follows:
— PE 100-RC type materials with enhanced resistance to slow crack growth (SCG) have been added;
— requirements for the compound for identification stripes have been updated;
— the nominal outside diameter range of the pipe has been increased to 800 mm;
— the PE 80 20 °C/100 h control point has been changed to 10 MPa with a note to advise that 9 MPa is
applicable if the ISO 9080 data set for a material indicates that a lower value is applicable;
— test methods have been updated and new methods have been added for PE 100-RC materials.
A list of all parts in the ISO 4437 series can be found on the ISO website.
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 ISO 4437 series specifies the requirements for a piping system and its components made from
polyethylene (PE) compounds, which is intended to be used for the supply of gaseous fuels.
This document covers the characteristics of pipes.
Requirements and test methods for materials and components, other than pipes, are specified in ISO 4437-1,
ISO 4437-3 and ISO 4437-4.
Characteristics for fitness for purpose of the system are covered in ISO 4437-5.
Recommended practice for design, handling and installation is given in ISO/TS 10839.

v
International Standard ISO 4437-2:2024(en)
Plastics piping systems for the supply of gaseous fuels —
Polyethylene (PE) —
Part 2:
Pipes
1 Scope
This document specifies the characteristics of pipes made from polyethylene (PE) for piping systems in the
field of the supply of gaseous fuels.
It also specifies the test parameters for the test methods referred to in this document.
In conjunction with ISO 4437-1, ISO 4437-3, ISO 4437-4 and ISO 4437-5, this document is applicable to PE
pipes, fittings and valves, their joints, and joints with components of PE and other materials intended to be
used under the following conditions:
1)
a) a maximum operating pressure (MOP), up to and including 10 bar , at a reference temperature of 20 °C
for de
...

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