ISO 4437-5:2014
(Main)Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) — Part 5: Fitness for purpose of the system
Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) — Part 5: Fitness for purpose of the system
ISO 4437-5:2014 specifies the requirements of fitness for purpose of the polyethylene (PE) piping system to be used for the supply of gaseous fuels. It specifies the definitions of electrofusion, socket fusion, butt fusion, and mechanical joints. It specifies the method of preparation of test piece joints and the tests to be carried out on these joints for assessing the fitness for purpose of the system under normal and extreme conditions. It specifies the test parameters for the test methods referred to in this part of ISO 4437. In conjunction with ISO 4437‑1, ISO 4437‑2, ISO 4437‑3, and ISO 4437‑4, it is applicable to PE pipes, fittings, valves, their joints, and joints with components of PE and other materials intended to be used under the following conditions: the maximum operating pressure (MOP) is based on the design stress, determined from the compound minimum required strength (MRS) divided by the C factor, and taking into account rapid crack propagation (RCP) requirements; and a temperature of 20 °C is taken as reference temperature for the design basis.
Systèmes de canalisations en matières plastiques pour la d istribution de combustibles gazeux — Polyéthylène (PE) — Partie 5: Aptitude à l'emploi du système
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INTERNATIONAL ISO
STANDARD 4437-5
First edition
2014-01-15
Plastics piping systems for the supply
of gaseous fuels - Polyethylene (PE) —
Part 5:
Fitness for purpose of the system
Systèmes de canalisations en matières plastiques pour la d istribution
de combustibles gazeux — Polyéthylène (PE) —
Partie 5: Aptitude à l’emploi du système
Reference number
ISO 4437-5:2014(E)
©
ISO 2014
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ISO 4437-5:2014(E)
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© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
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Published in Switzerland
ii © ISO 2014 – All rights reserved
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ISO 4437-5:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Fitness for purpose of the system . 2
4.1 Method of preparation of assemblies for testing . 2
4.2 Requirements for fitness for purpose of the system . 3
4.3 Conditioning . 6
4.4 Requirements . 6
4.5 Retest in case of failure at 80 °C . 6
5 Design coefficient . 6
Annex A (informative) Derating coefficients for operating temperatures.9
Annex B (normative) Rapid crack propagation (RCP) resistance of pipe at temperatureless than
0 °C .10
Bibliography .11
© ISO 2014 – All rights reserved iii
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ISO 4437-5:2014(E)
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 documents 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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is 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 first edition of ISO 4437-5 together with the first editions of ISO 4437-1, ISO 4437-2 and ISO 4437-3
cancel and replace ISO 4437:2007, ISO 8085-1:2001, ISO 8085-2:2001 and ISO 8085-3:2001, of which
they constitute a technical revision.
ISO 4437 consists of the following parts, under the general title Plastics piping systems for the supply of
gaseous fuels — Polyethylene (PE):
— Part 1: General
— Part 2: Pipes
— Part 3: Fittings
— Part 4: Valves
— Part 5: Fitness for purpose of the system
iv © ISO 2014 – All rights reserved
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ISO 4437-5:2014(E)
Introduction
This part of ISO 4437 specifies the requirements of a piping system and its components made from
polyethylene (PE), and which is intended to be used for the supply of gaseous fuels.
Requirements and test methods for material and components are specified in ISO 4437-1, ISO 4437-2,
ISO 4437-3, and ISO 4437-4.
[2]
Recommended practice for installation is given in ISO/TS 10839.
This part of ISO 4437 covers the characteristics of fitness for purpose of the system.
© ISO 2014 – All rights reserved v
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INTERNATIONAL STANDARD ISO 4437-5:2014(E)
Plastics piping systems for the supply of gaseous fuels -
Polyethylene (PE) —
Part 5:
Fitness for purpose of the system
1 Scope
This part of ISO 4437 specifies the requirements of fitness for purpose of the polyethylene (PE) piping
system to be used for the supply of gaseous fuels.
It specifies the definitions of electrofusion, socket fusion, butt fusion, and mechanical joints.
It specifies the method of preparation of test piece joints and the tests to be carried out on these joints
for assessing the fitness for purpose of the system under normal and extreme conditions.
It specifies the test parameters for the test methods referred to in this part of ISO 4437.
In conjunction with ISO 4437-1, ISO 4437-2, ISO 4437-3, and ISO 4437-4, it is applicable to PE pipes,
fittings, valves, their joints, and joints with components of PE and other materials intended to be used
under the following conditions:
a) the maximum operating pressure (MOP) is based on the design stress, determined from the
compound minimum required strength (MRS) divided by the C factor, and taking into account rapid
crack propagation (RCP) requirements;
b) a temperature of 20 °C as reference temperature for the design basis.
NOTE 1 For other operating temperatures, derating coefficients are given in Annex A.
NOTE 2 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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 1167-1:2006, 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 internal pressure — Part 2: Preparation of pipe test pieces
ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
ISO 4437-2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes
ISO 4437-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
© ISO 2014 – All rights reserved 1
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ISO 4437-5:2014(E)
1)
ISO 10838-1 , Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ― Part 1:
Metal fittings for pipes of nominal outside diameter less than or equal to 63 mm
1)
ISO 10838-2 , Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ― Part 2:
Metal fittings for pipes of nominal outside diameter greater than 63 mm
1)
ISO 10838-3 , Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ― Part 3:
Thermoplastics fittings for pipes of nominal outside diameter less than or equal to 63 mm
ISO 11413:2008, Plastics pipes and fittings — Preparation of test piece assemblies between a polyethylene
(PE) pipe and an electrofusion fitting
ISO 11414:2009, Plastics pipes and fittings — Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test
piece assemblies by butt fusion
ISO 13477, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Small-scale steady-state test (S4 test)
ISO 13478, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Full-scale test (FST)
ISO 13953, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure mode of
test pieces from a butt-fused joint
ISO 13954, Plastics pipes and fittings — Peel decohesion test for polyethylene (PE) electrofusion assemblies
of nominal outside diameter greater than or equal to 90 mm
ISO 13955, Plastics pipes and fittings — Crushing decohesion test for polyethylene (PE) electrofusion
assemblies
ISO 13956, Plastics pipes and fittings — Decohesion test of polyethylene (PE) saddle fusion joints —
Evaluation of ductility of fusion joint interface by tear test
ISO 21751, Plastics pipes and fittings — Decohesion test of electrofusion assemblies — Strip-bend test
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4437-1 and the following apply.
3.1
mechanical joint
joint made by assembling a PE pipe with a fitting that generally includes a compression part to provide
for pressure integrity, leak tightness, and resistance to end loads
4 Fitness for purpose of the system
4.1 Method of preparation of assemblies for testing
4.1.1 General
The joints shall be made by using pipes conforming to ISO 4437-2 and fittings conforming to ISO 4437-3.
Test pieces for pressure testing shall be closed with pressure-tight, end-load-bearing end caps, plugs, or
flanges which shall be provided with connections for the entry of water and release of air.
The peelable layer of peelable-layer pipe shall be removed in the area of the joint prior to jointing.
Test assemblies should be prepared taking into consideration applicable national safety regulations.
1) These International Standards are under revision and will be replaced by ISO 17885.
2 © ISO 2014 – All rights reserved
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ISO 4437-5:2014(E)
4.1.2 Butt fusion joints
PE pipes, spigot end fittings, and valves intended to be used for jointing by butt fusion shall be prepared
and assembled in accordance with ISO 11414:2009. The conditions for the preparation of the joints are
given in 4.2.2.1 for the assessment of fitness for purpose of the system under normal conditions and in
4.2.2.2 for the assessment of fitness for purpose of the system under extreme conditions.
4.1.3 Electrofusion joints
PE pipes, fittings and valves intended to be used for jointing by electrofusion shall be prepared and
assembled in accordance with ISO 11413:2008. The conditions for the preparation of the joints are given
in 4.2.3.1 for the assessment of fitness for purpose of the system under normal conditions and in 4.2.3.2
for the assessment of fitness for purpose of the system under extreme conditions.
For joints with electrofusion saddle fittings, the electrofusion saddle fitting shall be fused to the pipe
while it is pneumatically pressurized to the allowable maximum operating pressure. The pipe shall be
cut immediately after the manufacturer prescribed cooling time has elapsed.
For straight equal electrofusion socket fittings (couplers), test joints on selected diameters out of the
product range shall be prepared with a gap of 0,05d between the pipe end and the maximum theoretical
n
depth of penetration of the fitting, where for diameters greater th
...
DRAFT INTERNATIONAL STANDARD ISO/DIS 4437-5
ISO/TC 138/SC 4 Secretariat: NEN
Voting begins on Voting terminates on
2012-09-16 2012-12-16
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ ORGANISATION INTERNATIONALE DE NORMALISATION
Plastics piping systems for the supply of gaseous fuels —
Polyethylene (PE) —
Part 5:
Fitness for purpose
Systèmes de canalisations en matières plastiques pour la distribution de combustibles gazeux —
Polyéthylène (PE) —
Partie 5: Aptitude à l'emploi
[Revision of third edition (ISO 4437:2007)]
ICS 75.200; 83.140.30
To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Organization for Standardization, 2012
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ISO/DIS 4437-5
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to 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 copyright@iso.org
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2012 – All rights reserved
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ISO/DIS 4437-5
Contents Page
Foreword. iv
Introduction .v
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Fitness for purpose .3
4.1 Method of preparation of assemblies for testing .3
4.1.1 General.3
4.1.2 Butt fusion joints .3
4.1.3 Electrofusion jointing.3
4.1.4 Mechanical joints.3
4.2 Requirements for fitness for purpose .4
4.2.1 General.4
4.2.2 Fitness for purpose of butt fusion joints .4
4.2.3 Fitness for purpose for electrofusion joints .5
4.2.4 Fitness for purpose for mechanical joints .6
4.3 Conditioning.6
4.4 Requirements.6
4.5 Retest in case of failure at 80 °C .7
5 Design coefficient.8
Annex A (informative) Derating coefficients for operating temperatures .9
Annex B (normative) Rapid crack propagation (RCP) resistance of pipe at temperature less than
0 °C .10
Bibliography .11
© ISO 2012 – All rights reserved iii
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ISO/DIS 4437-5
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.
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 4437-5 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 fourth edition, together with the other parts of ISO 4437, cancels and replaces ISO 4437:2007 and ISO
8085-1/2/3:2001, of which it constitutes a technical revision.
ISO 4437 consists of the following parts, under the general title Plastics piping systems for the supply of
gaseous fuels — Polyethylene (PE):
¾ Part 1: General
¾ Part 2: Pipes
¾ Part 3: Fittings
¾ Part 4: Valves
¾ Part 5: Fitness for purpose of the system
iv © ISO 2012 – All rights reserved
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ISO/DIS 4437-5
Introduction
ISO/TS 10839 [1[ gives recommended practices for installation.
© ISO 2012 – All rights reserved v
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DRAFT INTERNATIONAL STANDARD ISO/DIS 4437-5
Plastics piping systems for the supply of gaseous fuels —
Polyethylene (PE) — Part 5: Fitness for purpose
1 Scope
This International Standard specifies requirements of fitness for purpose of the polyethylene (PE) piping
system intended to be used for the supply of gaseous fuels.
It specifies the definitions of electrofusion, socket fusion?, butt fusion and mechanical joints.
It specifies the method of preparation of test piece joints, and the tests to be carried out on these joints for
assessing the fitness for purpose of the system under normal and extreme conditions.
It specifies the test parameters for the test methods referred to in this standard.
In conjunction with Parts 1 to 4 of ISO 4437, it is applicable to PE pipes, fittings, valves, their joints and joints
with components of other materials intended to be used under the following conditions:
The maximum operating pressure MOP is based on the design stress, determined from the compound MRS
divided by the C factor, and taking into account RCP requirements;
A temperature of 20 °C as reference temperature.for the design basis.
NOTE 1 For other operating temperatures, derating coefficients should be used, see Annex A.
ISO 4437 (all parts) covers a range of maximum operating pressures and gives requirements concerning
additives.
NOTE 2 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.
2 Normative references
The following referenced documents are indispensable for the application 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 internal pressure — Part 2: Preparation of pipe test pieces
ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
ISO/DIS 4437-1:2012, Plastics piping systems for the supply of gaseous fuels ― Polyethylene (PE) ― Part 1:
General
© ISO 2012 – All rights reserved 1
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ISO/DIS 4437-5
ISO/DIS 4437-2:2012, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2:
Pipes
ISO/DIS 4437-3:2012, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3:
Fittings
ISO 10838-1 1), Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ― Part 1:
Metal fittings for pipes of nominal outside diameter less than or equal to 63 mm
ISO 10838-2 1), Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ― Part 2:
Metal fittings for pipes of nominal outside diameter greater than 63 mm
ISO 10838-3 1), Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ― Part 3:
Thermoplastics fittings for pipes of nominal outside diameter less than or equal to 63 mm
ISO 11413:2008, Plastics pipes and fittings ― Preparation of test piece assemblies between a polyethylene
(PE) pipe and an electrofusion fitting
ISO 11414:2009, Plastics pipes and fittings ― Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test
piece assemblies by butt fusion
ISO 13477, Thermoplastics pipes for the conveyance of fluids ― Determination of resistance to rapid crack
propagation (RCP) ― Small-scale steady-state test (S4 test)
ISO 13478, Thermoplastics pipes for the conveyance of fluids ― Determination of resistance to rapid crack
propagation (RCP) ― Full scale test (FST)
ISO 13953, Polyethylene (PE) pipes and fittings ― Determination of the tensile strength and failure mode of
test pieces from a butt-fused joint
ISO 13954, Plastics pipes and fittings ― Peel decohesion test for polyethylene (PE) electrofusion assemblies
of nominal outside diameter greater than or equal to 90 mm
ISO 13955, Plastics pipes and fittings ― Crushing decohesion test for polyethylene (PE) electrofusion
assemblies
ISO 13956, Plastics pipes and fittings ― Determination of cohesive strength ― Tear test for polyethylene (PE)
saddle assemblies
3 Terms and definitions
For the purposes of this document, the terms and definitions, symbols and abbreviations given in
ISO/DIS 4437-1:2012 and the following definition apply.
3.1
mechanical joint
joint made by assembling a PE pipe with a fitting that generally includes a compression part to provide for
pressure integrity, leaktightness and resistance to end loads
1) These standards are under revision and may be replaced by ISO 17885.
2 © ISO 2012 – All rights reserved
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ISO/DIS 4437-5
4 Fitness for purpose
4.1 Method of preparation of assemblies for testing
4.1.1 General
The joints shall be made by using pipes conforming to ISO/DIS 4437-2:2012, and fittings conforming to
ISO/DIS 4437-3:2012.
Test pieces for pressure test shall be closed with pressure-tight, end-load-bearing end caps, plugs or flanges
which shall be provided with connections for the entry of water and release of air.
The peelable layer of peelable layer pipe shall be removed in the area of the joint prior to jointing.
4.1.2 Butt fusion joints
PE pipes, spigot end fittings and valves intended to be used for jointing by butt fusion shall be prepared and
assembled in accordance with ISO 11414:2009. The conditions for the preparation of the joints are given in
4.2.2.1 for the assessment of fitness for purpose under normal conditions and in 4.2.2.2 for the assessment of
fitness for purpose under extreme conditions.
4.1.3 Electrofusion jointing
PE pipes, fittings and valves
...
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