ISO/FDIS 11301-1
(Main)Piping systems for rehabilitation of underground gas supply networks — Part 1: Polyethylene (PE) material
Piping systems for rehabilitation of underground gas supply networks — Part 1: Polyethylene (PE) material
This document specifies requirements and test methods for pipes and fittings which are part of piping systems for the rehabilitation by means of renovation and trenchless replacement of underground gas supply networks. It is applicable to polyethylene (PE) pipes, fittings and assemblies, as manufactured and as installed. It is not applicable to the existing pipeline. It is applicable to technique families for renovation: — lining with continuous pipes; — lining with close-fit pipes; and technique families for trenchless replacement: — pipe bursting and pipe extraction; — horizontal directional drilling and impact moling. This document is applicable to: — PE solid wall single layered pipes (nominal outside diameter, dn), including any identification stripes; — PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside diameter, dn), as specified in Annex D, where all layers have the same MRS rating. Furthermore, when used with lining with continuous pipes and trenchless replacement this document is applicable to: — PE coated pipes (outside diameter, dn) having a peelable, contiguous, thermoplastics additional layer on the outside of the pipe (“coated pipe”), as specified in Annex D. When used with lining with close-fit lining pipes, the lining pipe is reduced in the factory or on site to provide a close-fitting independent or interactive pressure pipe liner. This document is applicable to jointing by means of butt fusion and electrofusion and to fabricated and injection-moulded fittings and mechanical connections of PE. This document is not applicable to push-fit jointed discrete pipes assembled as part of the trenchless installation process.
Systèmes de canalisations pour la réhabilitation des réseaux de distribution de gaz enterrés — Partie 1: Matériau Polyéthylène (PE)
General Information
- Status
- Not Published
- Technical Committee
- ISO/TC 138/SC 8 - Rehabilitation of pipeline systems
- Drafting Committee
- ISO/TC 138/SC 8 - Rehabilitation of pipeline systems
- Current Stage
- 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
- Start Date
- 27-Feb-2026
- Completion Date
- 27-Feb-2026
Relations
- Effective Date
- 12-Feb-2026
- Effective Date
- 05-Nov-2022
- Effective Date
- 05-Nov-2022
- Effective Date
- 05-Nov-2022
- Effective Date
- 05-Nov-2022
- Effective Date
- 05-Nov-2022
Overview
ISO/FDIS 11301-1 specifies the requirements and test methods for polyethylene (PE) pipes, fittings, and assemblies used in the rehabilitation of underground gas supply networks. This standard applies to both the as-manufactured and as-installed condition of PE piping systems, focusing on renovation and trenchless replacement techniques for existing gas pipelines. It addresses various PE pipe forms, including solid wall single-layered, co-extruded layered, and coated pipes, ensuring compatibility and performance across different rehabilitation methods.
ISO/FDIS 11301-1 is crucial for utility companies, pipeline engineers, and contractors involved in the rehabilitation and upgrade of aging gas distribution networks through modern, efficient, and minimally disruptive techniques. By standardizing requirements, the document contributes to safety, reliability, and longevity of gas supply infrastructure.
Key Topics
Scope of Application
- Covers renovation (lining with continuous and close-fit pipes) and trenchless replacement (pipe bursting, pipe extraction, horizontal directional drilling, and impact moling).
- Applicable to PE pipes and fittings as manufactured and installed; not relevant to existing pipelines themselves.
- Outlines acceptance criteria for PE solid wall pipes, pipes with co-extruded layers, and PE coated pipes with peelable outer layers.
Material and Product Requirements
- Specifies requirements for PE materials, ensuring minimum required strength (MRS) ratings are maintained across all pipe layers.
- Addresses compatibility with different jointing methods: butt fusion, electrofusion, and mechanical connections.
- Does not apply to push-fit jointed pipes as part of trenchless installations.
Testing and Quality Assurance
- Defines test methods for evaluating geometric, mechanical, physical, and performance characteristics of pipes and fittings both in factory and after installation.
- Includes details on marking, identification stripes, and documentation requirements.
Installation and Practice
- Covers guidance for preparatory work, equipment handling, on-site testing, and reconnection processes.
- Provides standardized installation procedures for safety and fitness for purpose.
- Addresses inspection, final testing, and record-keeping to ensure compliance and longevity.
Applications
ISO/FDIS 11301-1 supports a wide range of trenchless technology applications that are increasingly used for gas pipeline rehabilitation, including:
- Lining techniques: Both continuous pipe and close-fit pipe lining methods are used to renovate aging or deteriorating underground gas networks with minimal excavation.
- Trenchless replacement: Pipe bursting and extraction, as well as horizontal directional drilling (HDD) and impact moling, enable replacement of gas pipelines beneath roads, buildings, or other sensitive areas with reduced surface disruption.
- Utility Network Upgrades: Allows gas utility operators to modernize infrastructure cost-effectively, improving safety, reducing downtime, and extending service life.
- International and Regional Applicability: Harmonizes PE piping product and installation specifications across different regulatory jurisdictions, supporting global best practices in pipeline rehabilitation.
Related Standards
For comprehensive project planning and effective implementation, consider the following closely related standards:
- ISO 4437 series: Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE)
- EN 1555 series: Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE)
- ISO 11295: Classification and overview of pipeline rehabilitation technologies
- ISO/TS 11301-5: Under preparation, addressing unplasticized polyamide (PA-U) material for similar applications
By following ISO/FDIS 11301-1, stakeholders ensure consistent, high-quality installation and rehabilitation of underground gas supply networks with PE piping, promoting safety, reliability, and compliance with international standards.
Buy Documents
ISO/FDIS 11301-1 - Piping systems for rehabilitation of underground gas supply networks — Part 1: Polyethylene (PE) material/28/2024
ISO/FDIS 11301-1 - Piping systems for rehabilitation of underground gas supply networks — Part 1: Polyethylene (PE) material/13/2026
REDLINE ISO/FDIS 11301-1 - Piping systems for rehabilitation of underground gas supply networks — Part 1: Polyethylene (PE) material/13/2026
ISO/FDIS 11301-1 - Systèmes de canalisations pour la réhabilitation des réseaux de distribution de gaz enterrés — Partie 1: Matériau Polyéthylène (PE)/30/2025
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Frequently Asked Questions
ISO/FDIS 11301-1 is a draft published by the International Organization for Standardization (ISO). Its full title is "Piping systems for rehabilitation of underground gas supply networks — Part 1: Polyethylene (PE) material". This standard covers: This document specifies requirements and test methods for pipes and fittings which are part of piping systems for the rehabilitation by means of renovation and trenchless replacement of underground gas supply networks. It is applicable to polyethylene (PE) pipes, fittings and assemblies, as manufactured and as installed. It is not applicable to the existing pipeline. It is applicable to technique families for renovation: — lining with continuous pipes; — lining with close-fit pipes; and technique families for trenchless replacement: — pipe bursting and pipe extraction; — horizontal directional drilling and impact moling. This document is applicable to: — PE solid wall single layered pipes (nominal outside diameter, dn), including any identification stripes; — PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside diameter, dn), as specified in Annex D, where all layers have the same MRS rating. Furthermore, when used with lining with continuous pipes and trenchless replacement this document is applicable to: — PE coated pipes (outside diameter, dn) having a peelable, contiguous, thermoplastics additional layer on the outside of the pipe (“coated pipe”), as specified in Annex D. When used with lining with close-fit lining pipes, the lining pipe is reduced in the factory or on site to provide a close-fitting independent or interactive pressure pipe liner. This document is applicable to jointing by means of butt fusion and electrofusion and to fabricated and injection-moulded fittings and mechanical connections of PE. This document is not applicable to push-fit jointed discrete pipes assembled as part of the trenchless installation process.
This document specifies requirements and test methods for pipes and fittings which are part of piping systems for the rehabilitation by means of renovation and trenchless replacement of underground gas supply networks. It is applicable to polyethylene (PE) pipes, fittings and assemblies, as manufactured and as installed. It is not applicable to the existing pipeline. It is applicable to technique families for renovation: — lining with continuous pipes; — lining with close-fit pipes; and technique families for trenchless replacement: — pipe bursting and pipe extraction; — horizontal directional drilling and impact moling. This document is applicable to: — PE solid wall single layered pipes (nominal outside diameter, dn), including any identification stripes; — PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside diameter, dn), as specified in Annex D, where all layers have the same MRS rating. Furthermore, when used with lining with continuous pipes and trenchless replacement this document is applicable to: — PE coated pipes (outside diameter, dn) having a peelable, contiguous, thermoplastics additional layer on the outside of the pipe (“coated pipe”), as specified in Annex D. When used with lining with close-fit lining pipes, the lining pipe is reduced in the factory or on site to provide a close-fitting independent or interactive pressure pipe liner. This document is applicable to jointing by means of butt fusion and electrofusion and to fabricated and injection-moulded fittings and mechanical connections of PE. This document is not applicable to push-fit jointed discrete pipes assembled as part of the trenchless installation process.
ISO/FDIS 11301-1 is classified under the following ICS (International Classification for Standards) categories: 23.040.20 - Plastics pipes; 23.040.45 - Plastics fittings; 75.200 - Petroleum products and natural gas handling equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO/FDIS 11301-1 has the following relationships with other standards: It is inter standard links to FprEN ISO 11301-1, ISO 11299-3:2018, ISO 21225-2:2018, ISO 21225-1:2018, ISO 11299-1:2018, ISO 11299-2:2018. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO/FDIS 11301-1 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
DRAFT
International
Standard
ISO/DIS 11301-1
ISO/TC 138/SC 8
Piping systems for rehabilitation
Secretariat: JISC
of underground gas supply
Voting begins on:
networks —
2025-02-24
Part 1:
Voting terminates on:
2025-05-19
Polyethylene (PE) material
Systèmes de canalisations pour la réhabilitation des réseaux de
distribution de gaz enterrés —
Partie 1: Matériau Polyéthylène (PE)
ICS: 75.200; 23.040.20; 23.040.45
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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.
Reference number
ISO/DIS 11301-1:2025(en)
DRAFT
ISO/DIS 11301-1:2025(en)
International
Standard
ISO/DIS 11301-1
ISO/TC 138/SC 8
Piping systems for rehabilitation
Secretariat: JISC
of underground gas supply
Voting begins on:
networks —
Part 1:
Voting terminates on:
Polyethylene (PE) material
Systèmes de canalisations pour la réhabilitation des réseaux de
distribution de gaz enterrés —
Partie 1: Matériau Polyéthylène (PE)
ICS: 75.200; 23.040.20; 23.040.45
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
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POTENTIAL TO BECOME STANDARDS TO
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or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
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TO SUBMIT, WITH THEIR COMMENTS,
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NOTIFICATION OF ANY RELEVANT PATENT
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 11301-1:2025(en)
ii
ISO/DIS 11301-1:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
3.1 General .2
3.2 Terms related to techniques .4
3.3 Terms related to characteristics.6
3.4 Terms related to product stages .9
3.5 Terms related to materials .9
3.6 Terms related to Service conditions .10
3.7 Terms related to Joints .10
4 Symbols and abbreviated terms.11
4.1 Symbols .11
4.2 Abbreviated terms .11
5 Pipes .12
5.1 Materials . 12
5.2 General characteristics . 12
5.3 Material characteristics . 12
5.4 Geometric characteristics . 12
5.5 Mechanical characteristics . 13
5.6 Physical characteristics . 13
5.7 Jointing. 13
5.8 Marking . 13
5.9 Regional requirements for pipes .14
6 Fittings . 14
6.1 Materials .14
6.2 Marking .14
6.3 Regional requirements for fittings .14
7 Ancillary components . 14
7.1 Requirements .14
7.2 Regional requirements for ancillary components .14
8 Fitness for purpose .15
8.1 Materials . 15
8.2 General characteristics . 15
8.3 Geometric characteristics . 15
8.4 Mechanical characteristics . 15
8.5 Sampling .16
8.6 Regional requirements for fitness for purpose .16
9 Installation practice .16
9.1 Preparatory work .16
9.2 Storage, handling and transport of pipes and fittings .16
9.3 Equipment .17
9.3.1 General .17
9.3.2 Butt fusion equipment and de-beading equipment .17
9.3.3 Pipe skids/rollers . .17
9.3.4 Winching and rod-pulling equipment . .18
9.3.5 Pipe entry guides .18
9.3.6 Electrofusion equipment .18
9.3.7 Inspection equipment .18
9.3.8 Lifting equipment .18
iii
ISO/DIS 11301-1:2025(en)
9.4 Installation .19
9.4.1 General .19
9.4.2 Safety precautions .19
9.4.3 Simulated installations .19
9.5 Process-related inspection and testing . 20
9.6 Pipe end termination . 20
9.7 Reconnection to the existing pipeline system . 20
9.8 Final inspection and testing . 20
9.9 Documentation .21
Annex A (normative) Specific requirements applicable for Lining with Continuous pipes .22
Annex B (normative) Specific requirements applicable for Lining with Close-fit pipes .23
Annex C (normative) Specific requirements for Trenchless replacement techniques - pipe
bursting, pipe extraction, HDD and impact moling .27
Annex D (normative) Layered pipes .32
Annex E (normative) Factory-folded heat-reverted polyethylene (PE) pipe — Determination of
memory ability .33
Annex F (informative) Pipe design considerations particular to pipe bursting and pipe
extraction .35
Annex G (informative) Pipe design considerations particular to HDD .37
Bibliography .39
iv
ISO/DIS 11301-1:2025(en)
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 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 the following URL:
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 8, Rehabilitation of pipeline systems.
For piping systems made from polyethylene (PE) material, this document replaces the related content,
including requirements, of the system standards:
ISO 11299-1, -2, -3 and ISO 21225-1, -2.
Once this part of ISO 11301-1 has been published, the above mentioned replaced standards will be
withdrawn.
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.
v
ISO/DIS 11301-1:2025(en)
Introduction
This document is a part of a System Standard for piping systems of various materials used for the
rehabilitation of existing pipelines in a specified application area. System Standards for rehabilitation deal
with the following applications:
— ISO 11300: Piping systems for rehabilitation of underground drains, sewers and water supply networks;
— ISO 11301: Piping systems for rehabilitation of underground gas supply networks.
The System Standards ISO 11300 and ISO 11301 are subdivided into parts covering a specific material per
pipe system.
ISO 11300 is subdivided into four parts:
— Part 1: Polyethylene (PE) material;
— Part 2: Thermoset composite materials;
— Part 3: Polyvinyl chloride (PVC-U) material;
— Part 4: Thermoplastic composite materials;
ISO 11301 currently consists of two parts:
— Part 1: Polyethylene (PE) material (this document);
— Part 5: Polyamide (PA-U) material (under development)
These System Standards cover various techniques for renovation and trenchless replacement. Furthermore,
they are distinguished from those for conventionally installed plastics piping systems by the requirement
to verify certain characteristics in the “as-installed” condition, after site processing. This is in addition to
specifying requirements for piping system components “as manufactured”.
A consistent structure of clause headings has been adopted for all parts of ISO 11300 and ISO 11301, in order
to facilitate direct comparisons across renovation technique families.
Figure 1 shows the clause structure and the relationship between ISO 11300 and ISO 11301.
[1]
For complementary information, see ISO 11295 .
System Standard ISO 11301-1 covers the content and replaces, for PE pipe systems, existing System
Standards for the rehabilitation of existing gas supply networks:
— The ISO 11299 series: Plastics piping systems for renovation of underground gas supply networks;
— The ISO 21225 series: Plastics piping systems for the trenchless replacement of underground pipeline
networks.
vi
ISO/DIS 11301-1:2025(en)
Figure 1 — Format of the rehabilitation system standards
vii
DRAFT International Standard ISO/DIS 11301-1:2025(en)
Piping systems for rehabilitation of underground gas supply
networks —
Part 1:
Polyethylene (PE) material
1 Scope
This document specifies requirements and test methods for pipes and fittings which are part of piping
systems for the rehabilitation by means of renovation and trenchless replacement of underground gas
supply networks.
It is applicable to polyethylene (PE) pipes, fittings and assemblies, as manufactured and as installed. It is not
applicable to the existing pipeline.
It is applicable to technique families for renovation:
— lining with continuous pipes;
— lining with close-fit pipes;
and technique families for trenchless replacement:
— pipe bursting and pipe extraction;
— horizontal directional drilling and impact moling.
and intended to be used at an operating temperature of 20 °C as the reference temperature.
NOTE For applications operating at constant temperatures greater than 20 °C and up to 40 °C, see ISO 4437-5:2024,
Annex A.
This document is applicable to:
— PE solid wall single layered pipes (nominal outside diameter, d ), including any identification stripes;
n
— PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside
diameter, d ), as specified in Annex D, where all layers have the same MRS rating.
n
Furthermore, when used with lining with continuous pipes and trenchless replacement this document is
applicable to:
— PE coated pipes (outside diameter, d ) having a peelable, contiguous, thermoplastics additional layer on
n
the outside of the pipe (“coated pipe”), as specified in Annex D.
When used with lining with close-fit lining pipes, the lining pipe is reduced in the factory or on site to provide
a close-fitting independent or interactive pressure pipe liner.
This document is applicable to jointing by means of butt fusion and electrofusion and to fabricated and
injection-moulded fittings and mechanical connections of PE.
This document is not applicable to push-fit jointed discrete pipes assembled as part of the trenchless
installation process.
ISO/DIS 11301-1:2025(en)
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 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 4437-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
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 4437-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves
ISO 4437-5:2024, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness
for purpose of the system
ISO 12176-1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1: Butt fusion
ISO 12176-2, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 2:
Electrofusion
ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous fuels
and hydrocarbon fluids
EN 682, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
EN 1555-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
EN 1555-2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes
EN 1555-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
EN 1555-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves
EN 1555-5:2021, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness
for purpose of the system
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 General
3.1.1
pipeline system
interconnecting pipe network for the conveyance of fluids
3.1.2
rehabilitation
measures for restoring or upgrading the performance of existing pipeline systems (3.1.1), including renovation
(3.1.3), repair (3.1.4) and replacement (3.1.5)
ISO/DIS 11301-1:2025(en)
3.1.3
renovation
work incorporating all or part of the original fabric of the pipeline, by means of which its current performance
is improved
3.1.4
repair
rectification of local damage
3.1.5
replacement
construction of a new pipeline, on or off the line of an existing pipeline, where the function of the new pipeline
system (3.1.1) incorporates that of the old
3.1.6
trenchless replacement
replacement (3.1.5) without opening trenches other than small excavations to provide access for the
particular technique and for service and lateral connections
3.1.7
maintenance
routine work undertaken to ensure the existing performance of an asset
3.1.8
rehabilitation pipe
PE pipe applied for renovation or trenchless replacement purposes
3.1.9
lining pipe
pipe for renovation purposes prior to any site processing
3.1.10
liner
lining pipe (3.1.9) after installation
3.1.11
lining system
lining pipe (3.1.9) and all relevant fittings for insertion into an existing pipeline for the purposes of
renovation (3.1.3)
3.1.12
renovated pipeline system
existing pipeline system (3.1.1) plus the installed lining system (3.1.11) used to renovate it, as well as any
annular filler (3.1.17) used
3.1.13
replacement pipe
new pipe installed for rehabilitation purposes
3.1.14
replacement system
replacement pipe and all relevant fittings for trenchless replacement on or off an existing pipeline for the
purposes of rehabilitation
3.1.15
characteristic
property, dimension or other feature of a material or component
3.1.16
annular filler
material for grouting (3.1.18) annular space between existing pipeline and lining system (3.1.11)
ISO/DIS 11301-1:2025(en)
3.1.17
grouting
process of filling voids around the lining system (3.1.11)
3.1.18
system test pressure
STP
either hydrostatic-or air pressure, or both applied to the installed pipeline system in order to ensure its
integrity and leaktightness
3.1.19
simulated installation
installation of a lining system (3.1.11) into a simulated host pipeline (3.1.18), using representative equipment
and processes, to provide samples for testing which are representative of an actual installation
3.1.20
simulated host pipeline
section of pipeline, which is not part of an operational network, but which replicates the environment of an
operational network
3.1.21
technique family
group of rehabilitation techniques which are considered to have common characteristics for standardization
purposes
3.1.22
coated pipe
pipe with a peelable, contiguous thermoplastic additional layer on the outside of the pipe
3.1.23
solid wall single layered pipe
pipe with smooth internal and external surface, extruded from the same compound throughout the wall
3.1.24
pipe with co-extruded layers
pipe with smooth internal and external surface, having co-extruded layers on either or both the outside and
inside of the pipe, where all layers have the same MRS rating
3.1.25
interactive pressure pipe liner
liner (3.1.10) which relies on the existing pipeline for some measure of radial support in order to resist
without failure all applicable internal loads throughout its design life
3.1.26
type testing
testing performed to prove that a material, component, joint or assembly is capable of conforming to the
requirements given in the applicable standard
3.1.27
CCTV
system comprised of cameras, recorders, interconnections and displays that are used to inspect pipelines
3.2 Terms related to techniques
The various techniques for rehabilitation of underground gas supply networks, within the scope of pipeline
rehabilitation techniques generally, are shown schematically in Figure 2. For definitions of standardized
renovation techniques shown in Figure 2, but outside the scope of this document, see ISO 11295.
ISO/DIS 11301-1:2025(en)
a
(This document is applicable, for pipe systems made from PE materials.)
Figure 2 — Technique families for rehabilitation of underground gas supply networks using plastics
pipes, within the scope of pipeline rehabilitation techniques
3.2.1
lining with continuous pipes
lining with pipe made continuous prior to insertion, where the diameter of the lining pipe remains unchanged
3.2.2
lining with close-fit pipes
lining with a continuous pipe, of which the cross-section is reduced to facilitate installation and reverted
after installation to provide a close fit to the existing pipe
Note 1 to entry: For the reduction in cross-section, the following are the two options:
— reduction in the pipe manufacturing plant: the pipe is usually supplied coiled on a reel, from which it is directly
inserted;
— reduction on site: the pipe is usually fed through the reduction equipment and simultaneously inserted in one
continuous string.
3.2.3
close fit
situation of the outside of the installed liner relative to the inside of the existing pipeline, which may either
be an interference fit or include a small annular gap resulting from shrinkage and tolerances only
ISO/DIS 11301-1:2025(en)
3.2.4
close-fit pipe
continuous lining pipe (3.1.9) of thermoplastic material reshaped or otherwise expanded after insertion to
achieve a close fit to the existing pipeline
3.2.5
pipe bursting
on the line replacement method in which an existing pipe is broken by longitudinal splitting or brittle
fracture, using a mechanically applied force from within, where the pipe fragments are forced into the
surrounding ground and a new pipe of the same, smaller or larger diameter, is simultaneously pulled in
3.2.6
bursting head
tool that can crack or split the existing pipe material
Note 1 to entry: Brittle pipe materials such as clay or grey cast iron crack. Ductile pipe materials such as ductile iron,
steel or PVC-U split.
3.2.7
pipe extraction
on the line replacement method in which an existing pipeline is extracted by pulling or pushing and replaced
with a new pipe of the same, smaller or larger diameter, which is simultaneously pulled or pushed in
3.2.8
horizontal directional drilling
HDD
off the line replacement method in which a pilot bore is drilled using a steerable drilling head connected to
flexible rods and then the bore is enlarged by reamers up to the diameter required for the pipe or pipes to be
subsequently pulled/pushed into place
3.2.9
impact moling
off the line replacement method in which pipes are pulled in behind a pneumatically powered soil
displacement hammer
3.3 Terms related to characteristics
3.3.1
nominal size
DN
numerical designation of the size of a component related to the inside or outside diameter
Note 1 to entry: It is a convenient round number approximately equal to the manufacturing dimension in millimetres
(mm). It is not applicable to components designated by thread size.
[SOURCE: ISO 4427-1:2019, 3.1.1, modified to include inside diameter as option]
3.3.2
nominal size DN/OD
DN/OD
nominal size, related to the outside diameter
3.3.3
nominal outside diameter
d
n
specified outside diameter, in millimetres, assigned to a nominal size DN/OD (3.3.2)
Note 1 to entry: For thermoplastics solid-wall components, the value of nominal outside diameter is identical to the
minimum mean outside diameter, d , defined in 3.3.5.
em,min
ISO/DIS 11301-1:2025(en)
3.3.4
mean outside diameter
d
em
value of the measurement of the outer circumference of the pipe or spigot end of a fitting in any cross-section
divided by π (= 3,142) and rounded to the next greater 0,1 mm
[SOURCE: ISO 4437-1:2024, 3.1.4]
3.3.5
minimum mean outside diameter
d
em,min
minimum value of the mean outside diameter as specified for a given nominal size
[SOURCE: ISO 4437-1: 2024, 3.1.5]
3.3.6
wall thickness
e
value of the measurement of the wall thickness at any point around the circumference of a component
3.3.7
mean wall thickness
e
m
arithmetic mean of a number of measurements of the wall thickness, regularly spaced around the
circumference and in the same cross-section of a component, including the measure minimum and the
maximum measured values of the wall thickness in that cross-section
[SOURCE: ISO 4437-1:2024, 3.1.12]
3.3.8
minimum wall thickness at any point
e
min
minimum value of the wall thickness at any point around the circumference of a component, as specified
[SOURCE: ISO 4437-1:2024, 3.1.10]
3.3.9
nominal wall thickness
e
n
numerical designation of the wall thickness of a component, which is a convenient round number,
approximately equal to the manufacturing dimension in millimetres (mm)
Note 1 to entry: For thermoplastics components conforming to the different parts of the ISO 4437 series, the value of
nominal wall thickness, e , is identical to the specified minimum wall thickness at any point, e .
n min
[SOURCE: ISO 4437-1:2024, 3.1.3]
3.3.10
nominal thickness of the coating
e
coating
arithmetic mean of a number of measurements of the coating thickness around the circumference and in the
same cross-section of a component
3.3.11
standard dimension ratio
SDR
numerical designation of a pipe series, which is a convenient round number, approximately equal to the
dimension ratio of the nominal outside diameter, d (3.3.3) (3.3.3), and the nominal wall thickness, e (3.3.9)
n n
[SOURCE: ISO 4437-1:2024, 3.1.6]
ISO/DIS 11301-1:2025(en)
3.3.12
internal pressure resistance
capability to withstand internal pressurization by water or gas
3.3.13
ring stiffness
resistance of a pipe to diametric deflection in response to external loading applied along one longitudinal
diametric plane
Note 1 to entry: This definition applies to both long and short-term values.
3.3.14
out-of-roundness
difference between the measured maximum and the measured minimum outside diameter in the same
cross-sectional plane of the pipe
3.3.15
minimum bending radius
minimum radius at any point throughout the length of the pipeline, measured to the longitudinal axis of the pipe
Note 1 to entry: This is usually expressed as a multiple of the pipe diameter.
3.3.16
lower confidence limit of the predicted hydrostatic strength
σ
LPL
quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the predicted
hydrostatic strength at a temperature θ and time t
Note 1 to entry: It is expressed in megapascals.
3.3.17
melt mass-flow rate
MFR
value relating to the viscosity of the molten material at a specified temperature and load
Note 1 to entry: It is expressed in grams per 10 min (g/10 min)
[SOURCE: ISO 4437-1:2024, 3.3.5]
3.3.18
minimum required strength
MRS
value of the lower confidence limit of the predicted hydrostatic strength(σ ) (3.3.16) at 20 °C and 50 years,
LPL
rounded down to the next smaller value of the R10 series the or the R20 series
Note 1 to entry: Only compounds (3.2.1) with an MRS of 8 MPa or 10 MPa are specified in this document.
Note 2 to entry: The R10 series and the R20 series conform to ISO 3 .
Note 3 to entry: It is expressed in megapascals (MPa).
[SOURCE: ISO 4437-1:2024, 3.3.2]
3.3.19
oxidation induction time
OIT
relative measure of a stabilized material’s resistance to oxidative decomposition, determined by the
calorimetric measurement of the time interval to the onset of exothermic oxidation of the material at a
specified temperature in an oxygen or air atmosphere, under atmospheric pressure
ISO/DIS 11301-1:2025(en)
3.4 Terms related to product stages
The characteristics of components used for renovation and the materials from which they are made can be
considered at two distinct stages as follows.
3.4.1
“M” stage
stage as manufactured, before any subsequent site processing of components associated with the particular
renovation technique
Note 1 to entry: For pipes and fittings at the “M” stage, see Clauses 5 and 6, respectively.
3.4.2
“I” stage
stage as installed, i.e. in final configuration after any site processing of components associated with the
particular renovation technique
Note 1 to entry: For pipes and fittings at the “I” stage, see Clause 8.
3.5 Terms related to materials
3.5.1
virgin material
material in a form such as granules, powder or liquid, which has not been subjected to use or processing other
than that required for its manufacture and to which no reprocessable or recyclable material has been added
3.5.2
own reprocessable material
material prepared from clean, rejected and unused pipes, fittings, or valves, including trimmings from the
production of pipes, fittings or valves, that is reprocessed in a manufacturer’s plant after having previously
been processed by the same manufacture in the production of a component by, for example, injection
moulding or extrusion
3.5.3
external reprocessable material
material from unused products or trimmings which will be reprocessed and which were originally processed
by another manufacturer
Note 1 to entry: If a manufacturer has a production of products other than pipes and fittings, reprocessable material
from that production is considered as external reprocessable material when used for pipes or fittings production.
3.5.4
recyclable material
material prepared from used products which have been cleaned and crushed or ground
3.5.5
compound
homogeneous extruded mixture of base polymer (polyethylene) and additives, (i.e. anti-oxidants, pigments,
carbon black, UV-stabilisers and others) at a dosage level necessary for the processing and use of components
[SOURCE: ISO 4437-1:2024, 3.2.3]
3.5.7
crazing
microstructural phenomenon associated with the short-term application of tensile bending strain exceeding
the material-related critical yield strain
3.5.8
drilling mud
fluid created by mixing water and additives to facilitate drilling and transport of drill cuttings from the drill
bit to the surface
ISO/DIS 11301-1:2025(en)
3.6 Terms related to Service conditions
3.6.1
nominal pressure
PN
numerical designation, which is a convenient rounded number for reference purposes
Note 1 to entry: For plastic piping systems conveying gas, it corresponds to the maximum continuous operating
pressure, expressed in bar, which can be sustained with water at 20 °C, based on the minimum design coefficient
[SOURCE: ISO 17885:2021, 3.1.10]
3.6.2
maximum operating pressure
MOP
1)
maximum effective pressure of gas in a piping system, expressed in bar , which is allowed in continuous use
Note 1 to entry: It takes into account the physical and mechanical characteristics of the components of the piping
system (and the influence of the gas on these characteristics) and it is calculated using the following formula:
20×MRS
MOP=
C×−SDR 1
()
[SOURCE: ISO 17885:2021, 3.1.11]
3.6.3
design coefficient
C
coefficient with a value greater than 1 which takes into consideration service conditions as well as
properties of the components of a piping system other than those represented in the lower confidence limit of
the predicted hydrostatic strength
[SOURCE: ISO 4437-1:2024, 3.3.3]
3.7 Terms related to Joints
3.7.1
butt fusion joint
joint made by heating the planed ends of pipes, the matching surfaces of which are fused together by holding
them against a flat heating plate until the polyethylene material reaches fusion temperature, removing the
heating plate quickly and pushing the two softened ends against one another
3.7.2
electrofusion joint
joint between a polyethylene electrofusion socket fitting or electrofusion saddle fitting and a pipe or spigot ends
fitting, made by heating the electrofusion fittings by the Joule effect of the heating element incorporated at
their jointing surfaces, causing the material adjacent to them to melt, and the pipe and fitting surfaces to fuse
Note 1 to entry: A support sleeve inserted into the pipe bore can be used to provide a permanent support for the
polyethylene pipe to prevent creep in the pipe wall under radial compressive forces.
3.7.3
fusion compatibility
ability of two similar or dissimilar polyethylene compounds to be fused together to form a joint.
[SOURCE: ISO 4437-1:2024, 3.5.2]
2 5 2
1) 1 bar = 0,1 MPa = 0,1 N/mm = 10 ⋅ N/m .
ISO/DIS 11301-1:2025(en)
3.7.4
mechanical joint
joint made by assembling a PE pipe to another PE pipe, or any other element using a fitting that generally
includes a compression part, to provide for pressure integrity, leaktightness and resistance to end loads
Note 1 to entry: A support sleeve inserted into the pipe bore can be used to provide a permanent support for the PE
pipe to prevent creep in the pipe wall under radial compressive forces.
[SOURCE: ISO 4427-1:2019, 3.5.4, with Note 1 to entry added]
4 Symbols and abbreviated terms
4.1 Symbols
C design coefficient
d outside diameter
e
d mean outside diameter
em
d minimum mean outside diameter
em,min
d original circular outside diameter of
...
FINAL DRAFT
International
Standard
ISO/TC 138/SC 8
Piping systems for rehabilitation
Secretariat: JISC
of underground gas supply
Voting begins on:
networks —
2026-02-27
Part 1:
Voting terminates on:
2026-04-24
Polyethylene (PE) material
Systèmes de canalisations pour la réhabilitation des réseaux de
distribution de gaz enterrés —
Partie 1: Matériau Polyéthylène (PE)
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 SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 138/SC 8
Piping systems for rehabilitation
Secretariat: JISC
of underground gas supply
Voting begins on:
networks —
Part 1:
Voting terminates on:
Polyethylene (PE) material
Systèmes de canalisations pour la réhabilitation des réseaux de
distribution de gaz enterrés —
Partie 1: Matériau Polyéthylène (PE)
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 SUPPOR TING DOCUMENTATION.
© ISO 2026
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
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INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
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Published in Switzerland Reference number
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
3.1 General .2
3.2 Terms related to techniques .5
3.3 Terms related to characteristics.6
3.4 Terms related to product stages .8
3.5 Terms related to materials .8
3.6 Terms related to service conditions .9
3.7 Terms related to joints .9
4 Symbols and abbreviated terms.10
4.1 Symbols .10
4.2 Abbreviated terms .11
5 Pipes .11
5.1 Materials .11
5.2 General characteristics .11
5.3 Material characteristics . 12
5.4 Geometric characteristics . 12
5.5 Mechanical characteristics . 12
5.6 Physical characteristics . 12
5.7 Jointing. 12
5.8 Marking . 13
5.9 Regional requirements for pipes . 13
6 Fittings .13
6.1 Materials . 13
6.2 Marking . 13
6.3 Regional requirements for fittings .14
7 Ancillary components . 14
7.1 Requirements .14
7.2 Regional requirements for ancillary components .14
8 Fitness for purpose . 14
8.1 Materials .14
8.2 General characteristics .14
8.3 Geometric characteristics . 15
8.4 Mechanical characteristics . 15
8.5 Sampling . 15
8.6 Regional requirements for fitness for purpose .16
9 Installation practice .16
9.1 Preparatory work .16
9.2 Storage, handling and transport of pipes and fittings .16
9.3 Equipment .16
9.3.1 General .16
9.3.2 Butt fusion equipment and de-beading equipment .17
9.3.3 Pipe skids/rollers . .17
9.3.4 Winching and rod-pulling equipment . .17
9.3.5 Pipe entry guides .17
9.3.6 Electrofusion equipment .17
9.3.7 Inspection equipment .18
9.3.8 Lifting equipment .18
iii
9.4 Installation .18
9.4.1 General .18
9.4.2 Safety precautions .19
9.4.3 Simulated installations .19
9.5 Process-related inspection and testing . 20
9.6 Pipe end termination . 20
9.7 Reconnection to the existing pipeline system . 20
9.8 Final inspection and testing . 20
9.9 Documentation . 20
Annex A (normative) Specific requirements applicable for lining with continuous pipes .21
Annex B (normative) Specific requirements applicable for lining with close-fit pipes .22
Annex C (normative) Specific requirements for trenchless replacement techniques — Pipe
bursting, pipe extraction, HDD and impact moling .26
Annex D (normative) Layered pipes .31
Annex E (normative) Factory-folded heat-reverted polyethylene (PE) pipe — Determination of
memory ability .32
Annex F (informative) Pipe design considerations particular to pipe bursting and pipe
extraction .34
Annex G (informative) Pipe design considerations particular to HDD .36
Annex H (informative) Summary of required elements to be included in installation manuals .38
Bibliography .39
iv
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 8, Rehabilitation of pipeline systems,in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastics piping systems and
ducting systems, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This first edition of ISO 11301-1 cancels and replaces ISO 11299-1:2018, ISO 11299-2:2018, ISO 11299-3:2018,
ISO 21225-1:2018 and ISO 21225-2:2018, which have been technically revised.
The main changes are as follows:
— for piping systems made from polyethylene (PE) material, this document replaces the related content,
including requirements, of the documents listed above.
A list of all parts in the ISO 11301 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.
v
Introduction
This document is a part of a series of International Standards for piping systems of various materials used
for the rehabilitation of existing pipelines in a specified application area. Standards for rehabilitation deal
with the following applications:
— the ISO 11300 series: Piping systems for rehabilitation of underground drains, sewers and water supply
networks;
— the ISO 11301 series: Piping systems for rehabilitation of underground gas supply networks.
The ISO 11300 series and the ISO 11301 series are subdivided into parts covering a specific material per
pipe system.
The ISO 11300 series is subdivided into four parts:
— Part 1: Polyethylene (PE) material;
— Part 2: Thermoset composite materials;
— Part 3: Polyvinyl chloride (PVC-U) material;
— Part 4: Thermoplastic composite materials.
The ISO 11301 series currently consists of two parts:
— Part 1: Polyethylene (PE) material (this document);
1)
— Part 2: Unplasticized Polyamide (PA-U) material.
These series of standards cover various techniques for renovation and trenchless replacement. Furthermore,
they are distinguished from those for conventionally installed plastics piping systems by the requirement
to verify certain characteristics in the “as-installed” condition, after site processing. This is in addition to
specifying requirements for piping system components “as manufactured”.
A consistent structure of clause headings has been adopted for all parts of the ISO 11300 series and the
ISO 11301 series, in order to facilitate direct comparisons across renovation technique families.
Figure 1 shows the clause structure and the relationship between the ISO 11300 series and the
ISO 11301 series.
For complementary information, see ISO 11295.
1) Under preparation. Stage at the time of publication: ISO/AWI TS 11301-5:2026.
vi
a
Under preparation
Figure 1 — Clause structure of the ISO 11300 series and the ISO 11301 series
The various techniques for rehabilitation of underground gas supply networks, within the scope of pipeline
rehabilitation techniques generally, are shown schematically in Figure 2. For definitions of standardized
renovation techniques shown in Figure 2, but outside the scope of this document, see ISO 11295.
vii
a
This document is applicable for pipe systems made from PE materials.
Figure 2 — Technique families for rehabilitation of underground gas supply networks using plastics
pipes, within the scope of pipeline rehabilitation techniques
viii
FINAL DRAFT International Standard ISO/FDIS 11301-1:2026(en)
Piping systems for rehabilitation of underground gas supply
networks —
Part 1:
Polyethylene (PE) material
1 Scope
This document specifies requirements and test methods for pipes and fittings which are part of piping
systems for the rehabilitation, by means of renovation and trenchless replacement, of underground gas
supply networks.
It is applicable to polyethylene (PE) pipes, fittings and assemblies, as manufactured and as installed. It is not
applicable to the existing pipeline.
This document is applicable to the following technique families for renovation, intended to be used at an
operating temperature of 20 °C as a reference temperature:
— lining with continuous pipes;
— lining with close-fit pipes.
This document is applicable to the following technique families for trenchless replacement, intended to be
used at an operating temperature of 20 °C as a reference temperature:
— pipe bursting and pipe extraction;
— horizontal directional drilling and impact moling.
This document is applicable to:
— PE solid wall single layered pipes (nominal outside diameter, d ), including any identification stripes;
n
— PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside
diameter, d ), as specified in Annex D, where all layers have the same minimum required strength (MRS)
n
rating.
Furthermore, when used with lining with continuous pipes and trenchless replacement, this document is
applicable to:
— PE coated pipes (outside diameter, d ) having a peelable, contiguous, thermoplastics additional layer on
n
the outside of the pipe (“coated pipe”), as specified in Annex D.
NOTE When used with lining with close-fit lining pipes, the lining pipe is reduced in the factory or on site to
provide a close-fitting independent or interactive pressure pipe liner.
This document is applicable to jointing by means of butt fusion and electrofusion and to fabricated and
injection-moulded fittings and mechanical connections of PE.
This document is not applicable to push-fit jointed discrete pipes assembled as part of the trenchless
installation process.
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 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 4437-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
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 4437-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves
ISO 4437-5, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness for
purpose of the system
ISO 12176-1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1: Butt
fusion
ISO 12176-2, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 2:
Electrofusion
ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous fuels
and hydrocarbon fluids
EN 682, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
EN 1555-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
EN 1555-2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes
EN 1555-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
EN 1555-4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves
EN 1555-5, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness for
purpose of the system
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 General
3.1.1
pipeline system
interconnecting pipe network for the conveyance of fluids
3.1.2
rehabilitation
measures for restoring or upgrading the performance of existing pipeline systems (3.1.1), including renovation
(3.1.3), repair (3.1.4) and replacement (3.1.5)
3.1.3
renovation
work incorporating all or part of the original fabric of the pipeline, by means of which its current performance
is improved
3.1.4
repair
rectification of local damage
3.1.5
replacement
construction of a new pipeline, on or off the line of an existing pipeline, where the function of the new pipeline
system (3.1.1) incorporates that of the old
3.1.6
trenchless replacement
replacement (3.1.5) without opening trenches other than small excavations to provide access for the
particular technique and for service and lateral connections
3.1.7
maintenance
routine work undertaken to ensure the existing performance of an asset
3.1.8
rehabilitation pipe
polyethylene (PE) pipe applied for renovation (3.1.3) or trenchless replacement (3.1.6) purposes
3.1.9
lining pipe
pipe for renovation (3.1.3) purposes prior to any site processing
3.1.10
liner
lining pipe (3.1.9) after installation
3.1.11
lining system
lining pipe (3.1.9) and all relevant fittings for insertion into an existing pipeline for the purposes of renovation
(3.1.3)
3.1.12
replacement pipe
new pipe installed for rehabilitation (3.1.2) purposes
3.1.13
installation manual
document that provides the information necessary to install a system or component and prepare the system
or component for operational use
[SOURCE: ISO/IEC/IEEE 24765:2017, 3.2006, modified — "set initial parameters" and "cf. diagnostic
manual, operator manual, programmer manual, support manual, user manual" have been removed from the
definition.]
3.1.14
rehabilitation system supplier
entity that specifies the field and range of application and brings together the components of a rehabilitation
(3.1.2) system to meet the requirements of the product standard at the “M” stage (3.4.1), so that when
installed in accordance with the installation manual (3.1.13) they meet the requirements of the product
standard at the “I” stage (3.4.2)
3.1.15
system installer
entity that prepares the host pipe, takes the rehabilitation (3.1.2) system at the “M” stage (3.4.1) and installs
it so that it is at the “I” stage (3.4.2)
3.1.16
characteristic
property, dimension or other feature of a material or component
3.1.17
grouting
process of filling voids around the lining system (3.1.11)
3.1.18
system test pressure
STP
hydrostatic and/or air pressure applied to the installed pipeline system (3.1.1), in order to ensure its integrity
and leaktightness
3.1.19
simulated installation
installation of a lining system (3.1.11) into a simulated host pipeline (3.1.20), using representative equipment
and processes, to provide samples for testing which are representative of an actual installation
3.1.20
simulated host pipeline
section of pipeline, which is not part of an operational network, but which replicates the environment of an
operational network
3.1.21
technique family
group of rehabilitation (3.1.2) techniques which are considered to have common characteristics (3.1.16) for
standardization purposes
3.1.22
coated pipe
pipe with a peelable, contiguous thermoplastic additional layer on the outside of the pipe
3.1.23
solid wall single layered pipe
pipe with smooth internal and external surface, extruded from the same compound/formulation throughout
the wall
3.1.24
pipe with co-extruded layer
pipe with smooth internal and external surface, having co-extruded layers on either or both the outside and
inside of the pipe, where all layers have the same minimum required strength(MRS) (3.3.16) rating
3.1.25
interactive pressure pipe liner
liner (3.1.10) which relies on the existing pipeline for some measure of radial support in order to resist
without failure all applicable internal loads throughout its design life
3.1.26
type testing
testing performed to prove that a material, component, joint or assembly is capable of conforming to the
requirements given in the applicable standard
3.1.27
closed-circuit television
CCTV
system comprised of cameras, recorders, interconnections and displays that are used to inspect pipelines
3.2 Terms related to techniques
3.2.1
lining with continuous pipe
lining with pipe made continuous prior to insertion, where the diameter of the lining pipe (3.1.9) remains
unchanged
3.2.2
lining with close-fit pipe
lining with a continuous pipe, of which the cross-section is reduced to facilitate installation and reverted
after installation to provide a close fit (3.2.3) to the existing pipe
Note 1 to entry: The reduction in cross-section can be achieved in one of two ways:
— reduction in the pipe manufacturing plant: the pipe is usually supplied coiled on a reel, from which it is directly
inserted;
— reduction on site: the pipe is usually fed through the reduction equipment and simultaneously inserted in one
continuous string.
3.2.3
close fit
situation of the outside of the installed liner (3.1.10) relative to the inside of the existing pipeline, which may
either be an interference fit or include a small annular gap resulting from shrinkage and tolerances only
3.2.4
close-fit pipe
continuous lining pipe (3.1.9) of thermoplastic material reshaped or otherwise expanded after insertion to
achieve a close fit (3.2.3) to the existing pipeline
3.2.5
pipe bursting
on-the-line replacement (3.1.5) method in which an existing pipe is broken by longitudinal splitting or brittle
fracture, using a mechanically applied force from within, where the pipe fragments are forced into the
surrounding ground and a new pipe of the same, smaller or larger diameter, is simultaneously pulled in
3.2.6
bursting head
tool that can crack or split the existing pipe material
Note 1 to entry: Brittle pipe materials such as clay or grey cast iron crack. Ductile pipe materials such as ductile iron,
steel or PVC-U split.
3.2.7
pipe extraction
on-the-line replacement (3.1.5) method in which an existing pipeline is extracted by pulling or pushing and
replaced with a new pipe of the same, smaller or larger diameter, which is simultaneously pulled or pushed
in
3.2.8
horizontal directional drilling
HDD
off-the-line replacement (3.1.5) method in which a pilot bore is drilled using a steerable drilling head
connected to flexible rods and then the bore is enlarged by reamers up to the diameter required for the pipe
or pipes to be subsequently pulled or pushed into place
3.2.9
impact moling
off-the-line replacement (3.1.5) method in which pipes are pulled in behind a pneumatically powered soil
displacement hammer
3.3 Terms related to characteristics
3.3.1
nominal size
DN/OD
numerical designation of the size of a component related to the inside or outside diameter
Note 1 to entry: It is a convenient round number approximately equal to the manufacturing dimension in millimetres
(mm). It is not applicable to components designated by thread size.
[SOURCE: ISO 4427-1:2019, 3.1.1, modified — "related to the outside diameter" has been expanded to "related
to the inside or outside diameter" in the definition.]
3.3.2
nominal outside diameter
d
n
specified outside diameter, in millimetres, assigned to a nominal size DN/OD (3.3.1)
Note 1 to entry: For thermoplastics solid-wall components, the value of nominal outside diameter is identical to the
minimum mean outside diameter, d , defined in 3.3.4.
em,min
3.3.3
mean outside diameter
d
em
value of the measurement of the outer circumference of the pipe or spigot end of a fitting in any cross-section
divided by π (= 3,142) and rounded to the next greater 0,1 mm
[SOURCE: ISO 4427-1:2019, 3.1.4]
3.3.4
minimum mean outside diameter
d
em,min
minimum value for the mean outside diameter (3.3.3), as specified for a given nominal size (3.3.1)
[SOURCE: ISO 4427-1: 2019, 3.1.5]
3.3.5
wall thickness
e
value of the measurement of the wall thickness at any point around the circumference of a component
3.3.6
mean wall thickness
e
m
arithmetic mean of a number of measurements of the wall thickness (3.3.5), regularly spaced around the
circumference and in the same cross-section of a component, including the measured minimum and the
measured maximum values of the wall thickness in that cross-section
[SOURCE: ISO 4427-1:2019, 3.1.12]
3.3.7
minimum wall thickness at any point
e
min
minimum value for the wall thickness (3.3.5) at any point around the circumference of a component
[SOURCE: ISO 4437-1:2024, 3.1.5]
3.3.8
nominal wall thickness
e
n
numerical designation of the wall thickness (3.3.5) of a component, which is a convenient round number,
approximately equal to the manufacturing dimension in millimetres (mm)
Note 1 to entry: For thermoplastics components conforming to the ISO 4437 series, the value of the nominal wall
thickness, e , is identical to the specified minimum wall thickness at any point, e (3.3.7).
n min
[SOURCE: ISO 4437-1:2024, 3.1.3]
3.3.9
nominal thickness of the coating
e
coating
arithmetic mean of a number of measurements of the coating thickness around the circumference and in the
same cross-section of a component
3.3.10
standard dimension ratio
SDR
numerical designation of a pipe series, which is a convenient round number, approximately equal to the
dimension ratio of the nominal outside diameter, d (3.3.2), and the nominal wall thickness, e (3.3.8)
n n
[SOURCE: ISO 4437-1:2024, 3.1.6]
3.3.11
ring stiffness
resistance of a pipe to diametric deflection in response to external loading applied along one longitudinal
diametric plane
Note 1 to entry: This definition applies to both long and short-term values.
3.3.12
out-of-roundness
difference between the measured maximum and the measured minimum outside diameter in the same
cross-sectional plane of the pipe
3.3.13
minimum bending radius
minimum radius at any point throughout the length of the pipeline, measured to the longitudinal axis of the
pipe
Note 1 to entry: This is usually expressed as a multiple of the pipe diameter.
3.3.14
lower confidence limit of the predicted hydrostatic strength
σ
LPL
quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the predicted
hydrostatic strength at a temperature θ and time t
Note 1 to entry: It is expressed in megapascals.
3.3.15
melt mass-flow rate
MFR
value relating to the viscosity of the molten material at a specified temperature and load
Note 1 to entry: It is expressed in grams per 10 min (g/10 min).
[SOURCE: ISO 4437-1:2024, 3.3.5]
3.3.16
minimum required strength
MRS
value of the lower confidence limit of the predicted hydrostatic strength (σ ) (3.3.14) at 20 °C and 50 years,
LPL
rounded down to the next smaller value of the R10 series the or the R20 series
Note 1 to entry: Only compounds (3.5.1) with an MRS of 8 MPa or 10 MPa are specified in this document.
Note 2 to entry: The R10 series and the R20 series conform to ISO 3.
Note 3 to entry: It is expressed in megapascals (MPa).
[SOURCE: ISO 4437-1:2024, 3.3.2]
3.3.17
oxidation induction time
OIT
relative measure of a stabilized material’s resistance to oxidative decomposition, determined by the
calorimetric measurement of the time interval to the onset of exothermic oxidation of the material at a
specified temperature in an oxygen or air atmosphere, under atmospheric pressure
3.4 Terms related to product stages
3.4.1
“M” stage
stage as manufactured, before any subsequent site processing of components associated with the particular
renovation (3.1.3) technique
Note 1 to entry: For pipes and fittings at the “M” stage, see Clause 5 and Clause 6, respectively.
3.4.2
“I” stage
stage as installed, i.e. in final configuration after any site processing of components associated with the
particular renovation (3.1.3) technique
Note 1 to entry: For pipes and fittings at the “I” stage, see Clause 8.
3.5 Terms related to materials
3.5.1
compound
homogeneous extruded mixture of base polymer (polyethylene) and additives (i.e. anti-oxidants, pigments,
carbon black, UV-stabilizers and others) at a dosage level necessary for the processing and use of components
[SOURCE: ISO 4437-1:2024, 3.2.1]
3.5.2
crazing
microstructural phenomenon associated with the short-term application of tensile bending strain exceeding
the material-related critical yield strain
3.5.3
drilling mud
fluid created by mixing water and additives to facilitate drilling and transport of drill cuttings from the drill
bit to the surface
3.6 Terms related to service conditions
3.6.1
nominal pressure
PN
numerical designation, which is a convenient rounded number for reference purposes
Note 1 to entry: For plastic piping systems conveying gas, it corresponds to the maximum continuous operating
pressure, expressed in bar, which can be sustained with water at 20 °C, based on the minimum design coefficient
(3.6.3).
5 2
Note 2 to entry: 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
[SOURCE: ISO 17885:2021, 3.1.10, modified — "conveying water" has been replaced by "conveying gas" in
Note 1 to entry. Note 2 to entry has been added.]
3.6.2
maximum operating pressure
MOP
maximum effective pressure of gas in a piping system that is allowed in continuous use
Note 1 to entry: MOP takes into account the physical and mechanical characteristics (3.1.16) of the components of the
piping system (and the influence of the gas on these characteristics). It is calculated using the following formula:
20MRS
MOP=
CSDR 1
5 2
Note 2 to entry: MOP is expressed in bar (1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm ).
[SOURCE: ISO 4437-1:2024, 3.4.2, modified — "pressure of the fluid" has been replaced by "pressure of gas"
in the definition. Information on the unit of measurement has been moved from Note 1 to entry to a new
Note 2 to entry. "And the influence of the gas on these characteristics" has been added to Note 1 to entry. The
original Note 2 to entry has been replaced.]
3.6.3
design coefficient
C
coefficient with a value greater than 1 which takes into consideration service conditions as well as
properties of the components of a piping system other than those represented in the lower confidence limit
of the predicted hydrostatic strength
[SOURCE: ISO 4437-1:2024, 3.3.3]
3.7 Terms related to joints
3.7.1
butt fusion joint
joint made by heating the planed ends of pipes, the matching surfaces of which are fused together by holding
them against a flat heating plate until the polyethylene material reaches fusion temperature, removing the
heating plate quickly and pushing the two softened ends against one another
3.7.2
electrofusion joint
joint between a polyethylene (PE) electrofusion socket fitting or electrofusion saddle fitting and a pipe
or spigot ends fitting, made by heating the electrofusion fittings by the Joule effect of the heating element
incorporated at their jointing surfaces, causing the material adjacent to them to melt, and the pipe and fitting
surfaces to fuse
Note 1 to entry: A support sleeve inserted into the pipe bore can be used to provide a permanent support for the PE
pipe to prevent creep in the pipe wall under radial compressive forces.
3.7.3
fusion compatibility
ability of two similar or dissimilar polyethylene compounds (3.5.1) to be fused together to form a joint
[SOURCE: ISO 4437-1:2024, 3.5.2]
3.7.4
mechanical joint
joint made by assembling a polyethylene (PE) pipe to another PE pipe, or any other element using a fitting
that generally includes a compression part, to provide for pressure integrity, leaktightness and resistance to
end loads
Note 1 to entry: A support sleeve inserted into the pipe bore can be used to provide a permanent support for the PE
pipe to prevent creep in the pipe wall under radial compressive forces.
[SOURCE: ISO 4427-1:2019, 3.5.3, modified — Note 1 to entry has been added.]
4 Symbols and abbreviated terms
4.1 Symbols
C design coefficient
d outside diameter
e
d mean outside diameter
em
d minimum mean outside dia
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ISO/TC 138/SC 8
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Secretariat: JISC
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Date: 2025-12-162026-02-13
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Piping systems for rehabilitation of underground gas supply
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Systèmes de canalisations pour la réhabilitation des réseaux de distribution de gaz enterrés pour l’alimentation
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Partie 1: Matériau Polyéthylène (PE)
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FDIS stage
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
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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'sISO’s member body in the country of the requester.
ISO Copyright Officecopyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
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Phone: + 41 22 749 01 11
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and numbers
Email: copyright@iso.org
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E-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
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Published in Switzerland.
and numbers
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ii
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Contents Formatted: Adjust space between Latin and Asian text,
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stops: Not at 0.71 cm
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
3.1 General. 3
3.2 Terms related to techniques . 5
3.3 Terms related to characteristics . 6
3.4 Terms related to product stages . 9
3.5 Terms related to materials . 9
3.6 Terms related to service conditions . 10
3.7 Terms related to joints . 10
4 Symbols and abbreviated terms . 11
4.1 Symbols . 11
4.2 Abbreviated terms . 12
5 Pipes . 12
5.1 Materials . 12
5.2 General characteristics . 12
5.3 Material characteristics . 13
5.4 Geometric characteristics . 13
5.5 Mechanical characteristics . 13
5.6 Physical characteristics . 13
5.7 Jointing . 14
5.8 Marking . 14
5.9 Regional requirements for pipes . 14
6 Fittings . 15
6.1 Materials . 15
6.2 Marking . 15
6.3 Regional requirements for fittings . 15
7 Ancillary components . 15
7.1 Requirements . 15
7.2 Regional requirements for ancillary components . 15
8 Fitness for purpose. 15
8.1 Materials . 15
8.2 General characteristics . 16
8.3 Geometric characteristics . 16
8.4 Mechanical characteristics . 16
8.5 Sampling . 17
8.6 Regional requirements for fitness for purpose . 17
9 Installation practice . 17
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9.1 Preparatory work . 17
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9.2 Storage, handling and transport of pipes and fittings . 17
9.3 Equipment . 18
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9.4 Installation . 20
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9.5 Process-related inspection and testing . 22
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9.6 Pipe end termination . 22
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9.7 Reconnection to the existing pipeline system . 23
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iii
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9.8 Final inspection and testing . 23
9.9 Documentation . 23
Annex A (normative) Specific requirements applicable for lining with continuous pipes . 24
Annex B (normative) Specific requirements applicable for lining with close-fit pipes . 25
Annex C (normative) Specific requirements for trenchless replacement techniques — Pipe
bursting, pipe extraction, HDD and impact moling . 29
Annex D (normative) Layered pipes . 34
Annex E (normative) Factory-folded heat-reverted polyethylene (PE) pipe — Determination of
memory ability. 35
Annex F (informative) Pipe design considerations particular to pipe bursting and pipe
extraction . 38
Annex G (informative) Pipe design considerations particular to HDD . 40
Annex H (informative) Summary of required elements to be included in installation manuals . 42
Bibliography . 44
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
5 Pipes . 11
5.1 Materials . 11
5.2 General characteristics . 12
5.3 Material characteristics . 12
5.4 Geometric characteristics . 12
5.5 Mechanical characteristics . 12
5.6 Physical characteristics . 12
5.7 Jointing . 13
5.8 Marking . 13
5.9 Regional requirements for pipes . 13
6 Fittings . 14
6.1 Materials . 14
6.2 Marking . 14
6.3 Regional requirements for fittings . 14
7 Ancillary components . 14
7.1 Requirements . 14
7.2 Regional requirements for ancillary components . 14
8 Fitness for purpose. 14
8.1 Materials . 14
8.2 General characteristics . 15
8.3 Geometric characteristics . 15
8.4 Mechanical characteristics . 15
8.5 Sampling . 16
8.6 Regional requirements for fitness for purpose . 16
9 Installation practice . 16
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iv
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9.1 Preparatory work . 16
9.2 Storage, handling and transport of pipes and fittings . 16
9.3 Equipment . 17
9.3.1 General. 17
9.3.2 Butt fusion equipment and de-beading equipment . 17
9.3.3 Pipe skids/rollers . 17
9.3.4 Winching and rod-pulling equipment . 17
9.3.5 Pipe entry guides . 18
9.3.6 Electrofusion equipment . 18
9.3.7 Inspection equipment . 18
9.3.8 Lifting equipment . 18
9.4 Installation . 18
9.4.1 General. 18
9.4.2 Safety precautions . 19
9.4.3 Simulated installations . 20
9.5 Process-related inspection and testing . 20
9.6 Pipe end termination . 20
9.7 Reconnection to the existing pipeline system . 20
9.8 Final inspection and testing . 21
9.9 Documentation . 21
Annex A (normative) Specific requirements applicable for lining with continuous pipes . 22
Annex B (normative) Specific requirements applicable for lining with close-fit pipes . 23
Annex C (normative) Specific requirements for trenchless replacement techniques — Pipe
bursting, pipe extraction, HDD and impact moling . 27
Annex D (normative) Layered pipes . 32
Annex E (normative) Factory-folded heat-reverted polyethylene (PE) pipe — Determination of
memory ability. 33
Annex F (informative) Pipe design considerations particular to pipe bursting and pipe
extraction . 35
Annex G (informative) Pipe design considerations particular to HDD . 37
Annex H (informative) Summary of required elements to be included in installation manuals . 39
Bibliography . 40
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v
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Foreword Formatted: Adjust space between Latin and Asian text,
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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).
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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.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.
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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 Formatted: Adjust space between Latin and Asian text,
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html. Adjust space between Asian text and numbers
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This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
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transport of fluids, Subcommittee SC 8, Rehabilitation of pipeline systems, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastics piping systems and ducting
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systems, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
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Agreement).
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This first edition of ISO 11301-1, cancels and replaces ISO 11299--1:2018, ISO 11299--2:2018, ISO 11299--
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3:2018, ISO 21225-1:2018 and ISO 21225-2:2018, which have been technically revised.
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The main changes are as follows: Formatted: Default Paragraph Font
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— for piping systems made from polyethylene (PE) material, this document replaces the related content,
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including requirements, of the documents listed above.
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A list of all parts in the ISO 11301 series can be found on the ISO website.
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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.htmlwww.iso.org/members.html.
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vi
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Introduction
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This document is a part of a series of International Standards for piping systems of various materials used for
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the rehabilitation of existing pipelines in a specified application area. Standards for rehabilitation deal with
the following applications:
— — the ISO 11300 series: Piping systems for rehabilitation of underground drains, sewers and water supply
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networks;
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— — the ISO 11301 series: Piping systems for rehabilitation of underground gas supply networks.
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stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
The ISO 11300 series and the ISO 11301 series are subdivided into parts covering a specific material per
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
pipe system.
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The ISO 11300 series is subdivided into four parts:
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— — Part 1: Polyethylene (PE) material;
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— — Part 2: Thermoset composite materials;
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— — Part 3: Polyvinyl chloride (PVC-U) material; Formatted: Default Paragraph Font
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— — Part 4: Thermoplastic composite materials;.
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The ISO 11301 series currently consists of two parts:
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— — Part 1: Polyethylene (PE) material (this document);
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1)
— Part 2: Unplasticized Polyamide (PA-U) material. Formatted: Default Paragraph Font
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These series of standards cover various techniques for renovation and trenchless replacement. Furthermore,
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they are distinguished from those for conventionally installed plastics piping systems by the requirement to
verify certain characteristics in the “as-installed” condition, after site processing. This is in addition to
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specifying requirements for piping system components “as manufactured”.
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A consistent structure of clause headings has been adopted for all parts of the ISO 11300 series and the
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ISO 11301 series, in order to facilitate direct comparisons across renovation technique families.
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Figure 1Figure 1 shows the clause structure and the relationship between the ISO 11300 series and the
ISO 11301 series.
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[1]
For complementary information, see ISO 11295 .
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This document covers the content and replaces, for PE pipe systems, existing standards for the rehabilitation
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of existing gas supply networks:
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— The ISO 11299 series: Plastics piping systems for renovation of underground gas supply networks;
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— The ISO 21225 series: Plastics piping systems for the trenchless replacement of underground pipeline
networks.
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1)
Under preparation. Stage at the time of publication: ISO/AWI TS 11301-5:2026.
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vii
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ISO 11301-1: PE material
ISO/TS 11301-5: PA-U material
a
Under preparation
Figure 1 — Clause structure of the ISO 11300 series and the ISO 11301 series
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Asian text, Adjust space between Asian text and
numbers
The various techniques for rehabilitation of underground gas supply networks, within the scope of pipeline
rehabilitation techniques generally, are shown schematically in Figure 2.Figure 2. For definitions of Formatted: Adjust space between Latin and Asian text,
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standardized renovation techniques shown in Figure 2,Figure 2, but outside the scope of this document, see
ISO 11295.
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viii
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a
(This document is applicable for pipe systems made from PE materials.)
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ix
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a
This document is applicable for pipe systems made from PE materials.
Figure 2 — Technique families for rehabilitation of underground gas supply networks using plastics
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pipes, within the scope of pipeline rehabilitation techniques
and Asian text, Adjust space between Asian text and
numbers
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x
FINAL DRAFT International Standard ISO/FDIS 11301-1:2025(en)
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Piping systems for rehabilitation of underground gas supply networks
— —
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Part 1:
and Asian text, Adjust space between Asian text and
Polyethylene (PE) material
numbers
1 Scope
This document specifies requirements and test methods for pipes and fittings which are part of piping systems
for the rehabilitation, by means of renovation and trenchless replacement, of underground gas supply
networks.
It is applicable to polyethylene (PE) pipes, fittings and assemblies, as manufactured and as installed. It is not
applicable to the existing pipeline.
ItThis document is applicable to the following technique families for renovation, intended to be used at an
operating temperature of 20 °C as a reference temperature:
— — lining with continuous pipes;
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— — lining with close-fit pipes;.
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
andThis document is applicable to the following technique families for trenchless replacement, intended to be
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used at an operating temperature of 20 °C as a reference temperature:
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— — pipe bursting and pipe extraction;
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— — horizontal directional drilling and impact moling;.
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
This document is applicable to:
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— — PE solid wall single layered pipes (nominal outside diameter, d ), including any identification stripes;
n
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— — PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
diameter, dn), as specified in Annex D,Annex D, where all layers have the same minimum required strength
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
(MRS) rating.
Furthermore, when used with lining with continuous pipes and trenchless replacement, this document is
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applicable to: Adjust space between Asian text and numbers
— — PE coated pipes (outside diameter, dn) having a peelable, contiguous, thermoplastics additional layer
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on the outside of the pipe (“coated pipe”), as specified in Annex D.Annex D.
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stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
NoteNOTE When used with lining with close-fit lining pipes, the lining pipe is reduced in the factory or on site to provide
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
a close-fitting independent or interactive pressure pipe liner.
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Asian text, Adjust space between Asian text and
This document is applicable to jointing by means of butt fusion and electrofusion and to fabricated and
injection-moulded fittings and mechanical connections of PE.
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Not at 17.2 cm
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This document is not applicable to push-fit jointed discrete pipes assembled as part of the trenchless
installation process.
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 3126, Plastics piping systems — Plastics components — Determination of dimensions
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Formatted
...
ISO 4437--1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
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Adjust space between Asian text and numbers, Tab
ISO 4437--2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
ISO 4437--3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
Formatted
...
ISO 4437--4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves
Formatted
...
ISO 4437--5:2024, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Formatted
...
Fitness for purpose of the system
Formatted
...
Formatted
...
ISO 12176--1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1: Butt
fusion Formatted
...
ISO 12176--2, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 2:
Formatted
...
Electrofusion
ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous
Formatted
...
fuels and hydrocarbon fluids
EN 682, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gas and
Formatted
...
hydrocarbon fluids
EN 1555--1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
Formatted
...
EN 1555--2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes
Formatted
...
EN 1555--3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
Formatted
...
EN 1555--4, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves
Formatted
...
EN 1555--5:2021, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5:
Formatted
...
Fitness for purpose of the system
3 Terms and definitions
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For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
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— — ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
Adjust space between Asian text and numbers, Tab
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
— — IEC Electropedia: available at https://www.electropedia.org/https://www.electropedia.org/
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
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3.1 General
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3.1.1 3.1.1
stops: Not at 0.71 cm
pipeline system
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interconnecting pipe network for the conveyance of fluids
and Asian text, Adjust space between Asian text and
numbers
3.1.2 3.1.2
rehabilitation
measures for restoring or upgrading the performance of existing pipeline systems (3.1.1),(3.1.1), including
renovation (3.1.3),(3.1.3), repair (3.1.4)(3.1.4) and replacement (3.1.5)(3.1.5)
3.1.3 3.1.3
renovation
work incorporating all or part of the original fabric of the pipeline, by means of which its current performance
is improved
3.1.4 3.1.4
repair
rectification of local damage
3.1.5 3.1.5
replacement
construction of a new pipeline, on or off the line of an existing pipeline, where the function of the new pipeline
system (3.1.1)(3.1.1) incorporates that of the old
3.1.6 3.1.6
trenchless replacement
replacement (3.1.5)(3.1.5) without opening trenches other than small excavations to provide access for the
particular technique and for service and lateral connections
3.1.7 3.1.7
maintenance
routine work undertaken to ensure the existing performance of an asset
3.1.8 3.1.8
rehabilitation pipe
polyethylene (PE) pipe applied for renovation (3.1.3) or trenchless replacement (3.16)(3.1.6) purposes
Formatted: Font: Italic
3.1.9 3.1.9
lining pipe
pipe for renovation (3.1.3) purposes prior to any site processing
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3.1.10 3.1.10
liner
lining pipe (3.1.9)(3.1.9) after installation
3.1.11 3.1.11
lining system
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lining pipe (3.1.9)(3.1.9) and all relevant fittings for insertion into an existing pipeline for the purposes of
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renovation (3.1.3)(3.1.3)
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3.1.12 3.1.12
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replacement pipe
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new pipe installed for rehabilitation (3.1.2) purposes
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3.1.13
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3.1.13 Installation
installation manual
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document that provides the information necessary to install a system or component and prepare the system
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or component for operational use
[SOURCE: ISO/IEC/IEEE 24765:2017, 3.2006, modified -- — "set initial parameters" and "cf deleted].
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diagnostic manual, operator manual, programmer manual, support manual, user manual" have been removed
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from the definition.]
3.1.14 3.1.14 Formatted: Term(s), Hyphenate
rehabilitation system supplier
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entity that specifies the field and range of application and brings together the components of a rehabilitation
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(3.1.2) system to meet the requirements of the product standard at the “M” stage (3.4.1),(3.4.1), so that when
installed in accordance with the installation manual (3.1.13) they meet the requirements of the product
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standard at the “I” stage (3.4.2)(3.4.2)
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3.1.15 3.1.15 Formatted: Font: Italic
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system installer
spacing: single
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entity that prepares the host pipe, takes the rehabilitation (3.1.2) system at the “M” stage (3.4.1)(3.4.1) and
installs it so that it is at the “I” stage (3.4.2)(3.4.2)
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and Asian text, Adjust space between Asian text and
3.1.16 3.1.16
numbers
characteristic
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property, dimension or other feature of a material or component
Latin and Asian text, Adjust space between Asian text
and numbers
3.1.17
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annular
...
PROJET
Norme
internationale
ISO/DIS 11301-1
ISO/TC 138/SC 8
Systèmes de canalisations pour
Secrétariat: JISC
la réhabilitation des réseaux de
Début de vote:
distribution de gaz enterrés —
2025-02-24
Partie 1:
Vote clos le:
2025-05-19
Matériau Polyéthylène (PE)
Piping systems for rehabilitation of underground gas supply
networks —
Part 1: Polyethylene (PE) material
ICS: 75.200; 23.040.20; 23.040.45
CE DOCUMENT EST UN PROJET DIFFUSÉ
POUR OBSERVATIONS ET APPROBATION. IL
EST DONC SUSCEPTIBLE DE MODIFICATION
ET NE PEUT ÊTRE CITÉ COMME NORME
INTERNATIONALE AVANT SA PUBLICATION EN
TANT QUE TELLE.
Le présent document est distribué tel qu’il est parvenu du secrétariat
du comité. OUTRE LE FAIT D’ÊTRE EXAMINÉS POUR
ÉTABLIR S’ILS SONT ACCEPTABLES À DES
FINS INDUSTRIELLES, TECHNOLOGIQUES ET
COMMERCIALES, AINSI QUE DU POINT DE VUE
DES UTILISATEURS, LES PROJETS DE NORMES
INTERNATIONALES DOIVENT PARFOIS ÊTRE
TRAITEMENT PARALLÈLE ISO/CEN
CONSIDÉRÉS DU POINT DE VUE DE LEUR
POSSIBILITÉ DE DEVENIR DES NORMES
POUVANT SERVIR DE RÉFÉRENCE DANS LA
RÉGLEMENTATION NATIONALE.
LES DESTINATAIRES DU PRÉSENT PROJET
SONT INVITÉS À PRÉSENTER, AVEC LEURS
OBSERVATIONS, NOTIFICATION DES DROITS
DE PROPRIÉTÉ DONT ILS AURAIENT
ÉVENTUELLEMENT CONNAISSANCE
ET À FOURNIR UNE DOCUMENTATION
EXPLICATIVE.
Numéro de référence
ISO/DIS 11301-1:2025(fr)
ISO/DIS 11301-1:2025(fr)
ISO/DIS 11301‐1:2025(fr)
ISO/TC 138/SC 8
Secrétariat : JISC
Date : 2024‐12‐28
Systèmes de canalisations pour la réhabilitation des réseaux de distribution de
gaz enterrés — Partie 1 : Matériau polyéthylène (PE)
Piping systems for rehabilitation of underground gas supply networks —
Part 1: Polyethylene (PE) material
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2025
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii
ISO/DIS 11301‐1:2025(fr)
Sommaire
Avant‐propos . v
Introduction . vi
1 Domaine d’application . 1
2 Références normatives . 2
3 Termes et définitions . 3
3.1 Généralités . 3
3.2 Termes relatifs aux techniques . 5
3.3 Termes relatifs aux caractéristiques . 7
3.4 Termes relatifs aux stades des produits . 10
3.5 Termes relatifs aux matières . 11
3.6 Termes relatifs aux conditions de service . 11
3.7 Termes relatifs aux assemblages . 12
4 Symboles et termes abrégés . 13
4.1 Symboles . 13
4.2 Termes abrégés . 13
5 Tubes . 14
5.1 Matières . 14
5.2 Caractéristiques générales . 14
5.3 Caractéristiques des matières . 14
5.4 Caractéristiques géométriques . 14
5.5 Caractéristiques mécaniques . 15
5.6 Caractéristiques physiques . 15
5.7 Assemblage . 15
5.8 Marquage . 15
5.9 Exigences régionales pour les tubes . 16
6 Raccords . 16
6.1 Matières . 16
6.2 Marquage . 16
6.3 Exigences régionales pour les raccords . 16
7 Accessoires . 16
7.1 Exigences . 16
7.2 Exigences régionales pour les accessoires . 17
8 Aptitude à l’emploi . 17
8.1 Matières . 17
8.2 Caractéristiques générales . 17
8.3 Caractéristiques géométriques . 18
8.4 Caractéristiques mécaniques . 18
8.5 Échantillonnage . 18
8.6 Exigences régionales pour l’aptitude à l’emploi . 19
9 Pratique d’installation . 19
9.1 Travaux préparatoires . 19
9.2 Stockage, manutention et transport des tubes et raccords . 19
9.3 Équipement . 20
9.3.1 Généralités . 20
9.3.2 Équipement de soudage bout à bout et suppression des bourrelets . 20
9.3.3 Patins/rouleaux pour tuyaux . 20
9.3.4 Équipement de treuillage et de traction à tige . 20
iii
ISO/DIS 11301‐1:2025(fr)
9.3.5 Guides pour l’insertion des tuyaux . 21
9.3.6 Appareillage d’électrosoudage . 21
9.3.7 Équipement d’inspection. 21
9.3.8 Équipement de levage . 21
9.4 Installation . 22
9.4.1 Généralités . 22
9.4.2 Précautions de sécurité . 22
9.4.3 Installations simulées . 23
9.5 Inspection et essais relatifs au processus d’installation . 23
9.6 Achèvement de l’extrémité des tuyaux . 23
9.7 Raccordement au système de canalisations existant . 24
9.8 Inspection finale et essais . 24
9.9 Documentation . 24
Annexe A (normative) Exigences spécifiques applicables au tubage par tuyau continu avec
espace annulaire . 25
Annexe B (normative) Exigences spécifiques applicables au tubage par tuyau continu sans
espace annulaire . 26
Annexe C (normative) Exigences spécifiques pour les techniques de remplacement sans
tranchée – éclatement de tuyau, extraction de tuyau, HDD et fonçage par fusée . 30
Annexe D (normative) Tuyaux en couches . 35
Annexe E (normative) Tuyau en polyéthylène (PE) rétabli à son état initial à chaud, plié en
usine — Détermination de la capacité de mémoire . 36
Annexe F (informative) Considérations sur la conception des tuyaux concernant
l’éclatement de tuyau et l’extraction de tuyau . 38
Annexe G (informative) Considérations sur la conception des tuyaux concernant le HDD . 40
Bibliographie . 42
iv
ISO/DIS 11301‐1:2025(fr)
Avant‐propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes
nationaux de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est en
général confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude a le droit
de faire partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales
et non gouvernementales, en liaison avec l’ISO participent également aux travaux. L’ISO collabore
étroitement avec la Commission électrotechnique internationale (IEC) en ce qui concerne la
normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d’approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’attention est attirée sur le fait que certains des éléments du présent document peuvent faire l’objet de
droits de brevet. L’ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de brevet. Les détails concernant les références aux droits de brevet identifiés lors de
l’élaboration du document sont indiqués dans l’Introduction et/ou dans la liste des déclarations de
brevets reçues par l’ISO (voir www.iso.org/brevets).
Les appellations commerciales éventuellement mentionnées dans le présent document sont données
pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un
engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l’ISO liés à l’évaluation de la conformité, ou pour toute information au sujet de l’adhésion
de l’ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles
techniques au commerce (OTC), voir le lien suivant : www.iso.org/iso/fr/avant-propos.html.
Le présent document a été élaboré par le comité technique ISO/TC 138, Tubes, raccords et robinetterie en
matières plastiques pour le transport des fluides, sous-comité SC 8, Réhabilitation des systèmes de
canalisations.
Pour les systèmes de canalisations en matériau polyéthylène (PE), le présent document remplace le
contenu correspondant, y compris les exigences, des Normes de Systèmes :
ISO 11299-1, -2, -3 et ISO 21225-1, -2.
Lorsque la présente partie de l’ISO 11301-1 aura été publiée, les normes remplacées mentionnées ci-
dessus seront retirées.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes
se trouve à l’adresse www.iso.org/fr/members.html.
v
ISO/DIS 11301‐1:2025(fr)
Introduction
Le présent document est une partie d’une Norme de Système pour les systèmes de canalisations à base
de matières variées, utilisés pour la réhabilitation de canalisations existantes pour une zone d’application
spécifiée. Les Normes de Systèmes relatives à la réhabilitation traitent des applications suivantes :
— ISO 11300 : Systèmes de canalisations pour la réhabilitation des branchements, des collecteurs
d’assainissement et des réseaux d’alimentation en eau enterrés ;
— ISO 11301 : Systèmes de canalisations pour la réhabilitation des réseaux de distribution de gaz enterrés.
Les Normes de Systèmes ISO 11300 et ISO 11301 sont subdivisées en parties couvrant une matière
spécifique par système de canalisations.
L’ISO 11300 est subdivisée en quatre parties :
— Partie 1 : Matériau polyéthylène (PE) ;
— Partie 2 : Matériaux composites thermodurcissables ;
— Partie 3 : Matériau polychlorure de vinyle (PVC‐U) ;
— Partie 4 : Matériaux composites thermoplastiques.
L’ISO 11301 est actuellement composée de deux parties :
— Partie 1 : Matériau polyéthylène (PE) (le présent document) ;
— Partie 5 : Matériau polyamide non plastifié (PA‐U) (en cours d’élaboration)
Ces Normes de Systèmes couvrent diverses techniques de rénovation et de remplacement sans tranchée.
En outre, elles se distinguent de celles relatives aux systèmes de canalisations en plastique installées
traditionnellement du fait qu’elles établissent des exigences concernant certaines caractéristiques liées
aux conditions « tel qu’installé », après mise en œuvre sur le site. Ces exigences viennent s’ajouter à celles
des composants du système de canalisations « tels que fabriqués ».
Une structure cohérente des titres des articles a été adoptée pour toutes les parties de l’ISO 11300 et de
l’ISO 11301 afin de faciliter des comparaisons directes entre les différentes familles de techniques de
rénovation.
La Figure 1 illustre la structure des articles et la relation entre l’ISO 11300 et l’ISO 11301.
[1]
.
Pour toute information complémentaire, voir l’ISO 11295
La Norme de Système ISO 11301-1 couvre le contenu et remplace, pour les systèmes en PE, les Normes
de Systèmes existantes pour la réhabilitation des réseaux de distribution de gaz :
— la série ISO 11299 : Systèmes de canalisations en plastique pour la rénovation des réseaux enterrés
de distribution de gaz ;
— la série ISO 21225 : Systèmes de canalisations en plastique pour le remplacement sans tranchée des
réseaux de canalisations enterrés.
vi
ISO/DIS 11301‐1:2025(fr)
Figure 1 — Présentation des Normes de Systèmes de réhabilitation
vii
PROJET DE NORME INTERNATIONALE ISO/DIS 11301‐1:2025(fr)
Systèmes de canalisations pour la réhabilitation des réseaux
de distribution de gaz enterrés — Partie 1 : Matériau
polyéthylène (PE)
1 Domaine d’application
Le présent document spécifie les exigences et les méthodes d’essai pour les tubes et raccords qui font
partie de systèmes de canalisations pour la réhabilitation par la rénovation et le remplacement sans
tranchée de réseaux de distribution de gaz enterrés.
Il est applicable aux tubes, raccords et assemblages en polyéthylène (PE), tels que fabriqués et tels
qu’installés. Il n’est pas applicable à la canalisation existante.
Il s’applique aux familles de techniques de rénovation :
— tubage par tuyau continu avec espace annulaire ;
— tubage par tuyau continu sans espace annulaire ;
et aux familles de techniques de remplacement sans tranchée :
— éclatement de tuyau et extraction de tuyau ;
— forage horizontal dirigé et fonçage par fusée.
et est destiné à être utilisé à une température de service de 20 °C, qui est la température de référence.
NOTE Pour les applications à température de service constante supérieure à 20 °C et jusqu’à 40 °C, voir
l’ISO 4437-5:2024, Annexe A.
Le présent document s’applique :
— aux tuyaux en PE monocouches à paroi compacte (diamètre extérieur nominal, d ), y compris les
n
bandes d’identification éventuelles ;
— aux tuyaux en PE avec des couches co-extrudées à l’extérieur et/ou à l’intérieur du tuyau (diamètre
extérieur total, d ), tels que spécifiés dans l’Annexe D, toutes les couches ayant la même classification
n
MRS.
En outre, lors d’une utilisation avec un tubage par tuyau continu avec espace annulaire et un
remplacement sans tranchée, le présent document s’applique :
— aux tuyaux revêtus de PE (diamètre extérieur, d ) comportant une couche supplémentaire
n
thermoplastique contiguë pelable sur leur surface externe (« tuyau revêtu »), tel que spécifié dans
l’Annexe D.
Lorsqu’il est utilisé avec des tuyaux continus sans espace annulaire, le tuyau de tubage est réduit en usine
ou sur site pour fournir un tubage autostructurant ou un tubage nécessitant le maintien de l’enveloppe
sans espace annulaire.
Le présent document s’applique à l’assemblage par soudage bout à bout et par électrosoudage, ainsi
qu’aux raccords façonnés et moulés par injection et aux raccordements mécaniques en PE.
ISO/DIS 11301‐1:2025(fr)
Le présent document n’est pas applicable aux tuyaux courts avec espace annulaire à emboîtement sans
soudure assemblés dans le cadre du processus d’installation sans tranchée.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique.
Pour les références non datées, la dernière édition du document de référence s’applique (y compris les
éventuels amendements).
ISO 3126, Systèmes de canalisations en plastiques — Composants en plastiques — Détermination des
dimensions
ISO 4437-1, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 1 : Généralités
ISO 4437-2, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 2 : Tubes
ISO 4437-3, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 3 : Raccords
ISO 4437-4, Systèmes de canalisations en plastique pour la distribution des combustibles gazeux —
Polyéthylène (PE) — Partie 4 : Robinets
ISO 4437-5:2024, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 5 : Aptitude à l’emploi du système
ISO 12176-1, Tubes et raccords en matières plastiques — Appareillage pour l’assemblage par soudage des
systèmes en polyéthylène — Partie 1 : Soudage bout à bout
ISO 12176-2, Tubes et raccords en matières plastiques — Appareillage pour l’assemblage par soudage des
systèmes en polyéthylène — Partie 2 : Électrosoudage
ISO 16010, Garnitures d’étanchéité en élastomères — Exigences matérielles pour les joints utilisés dans les
canalisations et les raccords véhiculant des combustibles gazeux et des hydrocarbures liquides
EN 682, Garnitures d’étanchéité en caoutchouc — Spécification des matériaux pour garnitures d’étanchéité
pour joints de canalisations et des raccords véhiculant du gaz et des fluides hydrocarbures
EN 1555-1, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 1 : Généralités
EN 1555-2, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 2 : Tubes
EN 1555-3, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 3 : Raccords
EN 1555-4, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 4 : Robinets
EN 1555-5:2021, Systèmes de canalisations en plastique pour la distribution de combustibles gazeux —
Polyéthylène (PE) — Partie 5 : Aptitude à l’emploi du système
ISO/DIS 11301‐1:2025(fr)
3 Termes et définitions
Pour les besoins du présent document, les termes et définitions suivants s’appliquent.
L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en
normalisation, consultables aux adresses suivantes :
— ISO Online browsing platform : disponible à l’adresse https://www.iso.org/obp
— IEC Electropedia : disponible à l’adresse https://www.electropedia.org/
3.1 Généralités
3.1.1
système de canalisations
ensemble de canalisations connectées pour le transport de fluides
3.1.2
réhabilitation
mesures de remise en état ou d’amélioration de la performance de systèmes de canalisations (3.1.1)
existants, y compris la rénovation (3.1.3), la réparation (3.1.4) et le remplacement (3.1.5)
3.1.3
rénovation
travaux concernant la totalité ou une partie de la structure d’origine de la canalisation grâce auxquels ses
performances sont améliorées
3.1.4
réparation
rectification d’une détérioration locale
3.1.5
remplacement
mise en place d’une nouvelle canalisation sur ou hors ligne d’une canalisation existante, le nouveau
système de canalisations (3.1.1) assurant la fonction de l’ancien
3.1.6
remplacement sans tranchée
remplacement (3.1.5) sans ouvrir de tranchées autres que de petites excavations pour fournir un accès
pour la technique considérée et pour les services et les raccordements latéraux
3.1.7
maintenance
travaux de routine réalisés pour assurer le maintien des performances d’un bien
3.1.8
tuyau de réhabilitation
tuyau en PE utilisé à des fins de rénovation ou de remplacement sans tranchée
3.1.9
tuyau de tubage
tuyau introduit à des fins de rénovation avant la mise en œuvre sur site
3.1.10
tubage
chemisage
ISO/DIS 11301‐1:2025(fr)
tuyau de tubage (3.1.9) après installation
3.1.11
système de tubage
tuyau de tubage (3.1.9) et tous les raccords correspondants insérés dans une canalisation existante pour
les besoins d’une rénovation (3.1.3)
3.1.12
système de canalisations rénovées
système de canalisations (3.1.1) existant incluant le système de tubage (3.1.11) installé utilisé pour le
rénover, y compris tout matériau de remplissage annulaire (3.1.17) utilisé
3.1.13
tuyau de remplacement
nouveau tuyau installé aux fins de réhabilitation
3.1.14
système de remplacement
tuyau de remplacement et tous les raccords correspondants pour le remplacement sans tranchée sur une
canalisation existante ou en dehors de celle-ci pour les besoins d’une rénovation
3.1.15
caractéristique
propriété, dimension ou autre caractéristique d’une matière/d’un matériau ou d’un composant
3.1.16
matériau de remplissage annulaire
matériau pour injection (3.1.18) dans l’espace annulaire entre la canalisation existante et le système de
tubage (3.1.11)
3.1.17
injection
procédé de remplissage des vides autour du système de tubage (3.1.11)
3.1.18
pression d’essai du système
STP
pression hydrostatique et/ou pression de l’air appliquée au système de canalisations installé de manière
à garantir son intégrité et son étanchéité
3.1.19
installation simulée
mise en œuvre d’un système de tubage (3.1.11) à l’intérieur d’une canalisation hôte de simulation (3.1.18)
en utilisant un équipement et des processus représentatifs, de manière à fournir des échantillons pour
essai représentatifs d’une installation réelle
3.1.20
canalisation hôte de simulation
tronçon de canalisation qui ne fait pas partie d’un réseau opérationnel mais qui en reproduit
l’environnement
3.1.21
famille de techniques
groupement de techniques de réhabilitation considérées comme présentant des caractéristiques
communes pour des besoins de normalisation
ISO/DIS 11301‐1:2025(fr)
3.1.22
tuyau revêtu
tuyau comportant une couche thermoplastique supplémentaire pelable et contiguë sur sa partie
extérieure
3.1.23
tuyau monocouche à paroi compacte
tuyau ayant une surface interne et externe lisse, extrudé en utilisant la même composition sur toute la
paroi
3.1.24
tuyaux avec des couches co‐extrudées
tuyau ayant une surface interne et externe lisse, avec des couches co-extrudées à l’extérieur et/ou à
l’intérieur du tuyau, toutes les couches ayant la même classification MRS
3.1.25
tubage nécessitant le maintien de l’enveloppe
tubage (3.1.10) qui a recours à la canalisation existante dans une certaine mesure comme support radial
en vue de résister sans défaillance à toutes les charges internes applicables durant toute sa durée de vie
théorique
3.1.26
essai de type
essai entrepris pour prouver qu’une matière, un composant, un assemblage ou un montage est apte à
remplir les exigences énoncées dans la norme pertinente
3.1.27
CCTV
système comprenant des caméras, des enregistreurs, des interconnexions et des unités d’affichage
permettant de contrôler les canalisations
3.2 Termes relatifs aux techniques
Les différentes techniques de réhabilitation des réseaux enterrés de distribution de gaz, dans le cadre des
techniques de réhabilitation de canalisations en général, sont schématisées à la Figure 2. Pour les
définitions des techniques de rénovation normalisées données à la Figure 2, mais en dehors du domaine
d’application du présent document, voir l’ISO 11295.
ISO/DIS 11301‐1:2025(fr)
a
(Le présent document est applicable aux systèmes de canalisation fabriqués à partir de matériaux PE.)
Figure 2 — Familles de techniques de réhabilitation des réseaux enterrés de distribution de gaz
au moyen de canalisations plastiques dans le cadre des techniques de réhabilitation de
canalisations
3.2.1
tubage par tuyau continu avec espace annulaire
tubage réalisé à l’aide d’un tuyau rendu continu avant son insertion, où le diamètre du tuyau de tubage
reste inchangé
3.2.2
tubage par tuyau continu sans espace annulaire
tubage réalisé à l’aide d’un tuyau continu dont la section est réduite pour faciliter l’installation et ramenée
à son diamètre initial après mise en place, pour assurer un contact étroit avec la canalisation existante
Note 1 à l’article : Il existe deux possibilités pour parvenir à réduire la section transversale :
ISO/DIS 11301‐1:2025(fr)
— une réduction dans l’usine de fabrication de tuyaux : le tuyau est généralement livré en bobine sur un touret
d’où il est introduit directement ;
— une réduction sur site : en général, le tuyau passe dans l’équipement de réduction et il est introduit
simultanément en continu.
3.2.3
absence d’espace annulaire
sans espace annulaire
situation de l’extérieur du tubage installé par rapport à l’intérieur de la canalisation existante, qui peut
soit être un contact avec interférence, soit inclure un petit espace annulaire dû uniquement au retrait et
aux tolérances
3.2.4
tuyau continu sans espace annulaire
tuyau de tubage (3.1.9) continu en matière thermoplastique reformé, ou dilaté d’une autre manière après
l’insertion, assurant l’absence d’espace annulaire avec la canalisation existante
3.2.5
éclatement de tuyau
méthode de remplacement sur ligne dans laquelle une canalisation existante est cassée par refendage
longitudinal ou rupture fragile, à l’aide d’une force appliquée mécaniquement depuis l’intérieur, les
fragments de tuyau étant repoussés dans le sol environnant et un nouveau tuyau de diamètre identique,
inférieur ou supérieur étant simultanément introduit
3.2.6
tête d’éclatement
outil permettant de fissurer ou de fendre le matériau du tuyau existant
Note 1 à l’article : Les matériaux de canalisations fragiles comme l’argile ou la fonte grise se fissurent. Les matériaux
de canalisations ductiles comme la fonte ductile, l’acier ou le PVC-U se fendent.
3.2.7
extraction de tuyau
méthode de remplacement sur ligne dans laquelle la canalisation existante est extraite par traction ou
poussée et remplacée par un nouveau tuyau de diamètre identique, inférieur ou supérieur, qui est
simultanément introduit par traction ou poussée
3.2.8
forage horizontal dirigé
HDD
méthode de remplacement hors ligne dans laquelle un trou pilote est foré au moyen d’une tête de forage
guidable raccordée à des tiges flexibles ; le trou est ensuite élargi par des alésoirs jusqu’au diamètre
requis pour le ou les tuyaux qui sont ensuite mis en place par traction ou poussée
3.2.9
fonçage par fusée
méthode de remplacement hors ligne dans laquelle des tuyaux sont tirés derrière un marteau de
déplacement de sol à alimentation pneumatique
3.3 Termes relatifs aux caractéristiques
3.3.1
dimension nominale
DN
ISO/DIS 11301‐1:2025(fr)
désignation numérique de la dimension d’un composant reliée au diamètre intérieur ou extérieur
Note 1 à l’article : Il s’agit d’un nombre rond pratique approximativement égal à la cote de fabrication en millimètres
(mm). Il n’est pas applicable aux composants désignés par leur filetage.
[SOURCE : ISO 4427-1:2019, 3.1.1, modifiée pour inclure l’option diamètre intérieur]
3.3.2
dimension nominale DN/OD
DN/OD
dimension nominale liée au diamètre extérieur
3.3.3
diamètre extérieur nominal
d
n
diamètre extérieur spécifié, en millimètres, attribué à une dimension nominale DN/OD (3.3.2)
Note 1 à l’article : Pour des composants thermoplastiques à parois compactes, la valeur du diamètre extérieur
nominal est identique au diamètre extérieur moyen minimal, d , défini en 3.3.5.
em,min
3.3.4
diamètre extérieur moyen
d
em
valeur du mesurage de la circonférence externe d’un tube ou du bout mâle d’un raccord dans une section
droite quelconque, divisée par π (= 3,142), et arrondie au 0,1 mm supérieur le plus proche
[SOURCE : ISO 4437-1:2024, 3.1.4]
3.3.5
diamètre extérieur moyen minimal
d
em,min
valeur minimale du diamètre extérieur moyen, spécifiée pour une dimension nominale donnée
[SOURCE : ISO 4437-1:2024, 3.1.5]
3.3.6
épaisseur de paroi
e
valeur du mesurage de l’épaisseur de paroi en un point quelconque sur la circonférence d’un composant
3.3.7
épaisseur de paroi moyenne
e
m
moyenne arithmétique d’un certain nombre de mesures de l’épaisseur de paroi, régulièrement espacées
autour de la circonférence et prises dans la même section transversale d’un composant, comprenant les
valeurs minimales et maximales mesurées de l’épaisseur de paroi dans cette section transversale
[SOURCE : ISO 4437-1:2024, 3.1.12]
3.3.8
épaisseur de paroi minimale en un point quelconque
e
min
valeur minimale spécifiée de l’épaisseur de paroi en un point quelconque de la circonférence d’un
composant
ISO/DIS 11301‐1:2025(fr)
[SOURCE : ISO 4437-1:2024, 3.1.10]
3.3.9
épaisseur de paroi nominale
e
n
désignation numérique de l’épaisseur de paroi d‘un composant, qui est un nombre arrondi pratique et
approximativement égal à la cote de fabrication en millimètres (mm)
Note 1 à l’article : Pour les composants en thermoplastiques conformes aux différentes parties de la série ISO 4437,
la valeur de l’épaisseur de paroi nominale, e , est identique à l’épaisseur de paroi minimale en un point quelconque,
n
e , spécifiée.
min
[SOURCE : ISO 4437-1:2024, 3.1.3]
3.3.10
épaisseur nominale du revêtement
e
coating
moyenne arithmétique d’un certain nombre de mesurages de l’épaisseur du revêtement sur la
circonférence et dans la même section transversale d’un composant
3.3.11
rapport des dimensions nominales
SDR
désignation numérique d’une série de tubes, qui est un nombre rond pratique approximativement égal
au quotient du diamètre extérieur nominal, d (3.3.3), et de l’épaisseur de paroi nominale, e (3.3.9)
n n
[SOURCE : ISO 4437-1:2024, 3.1.6]
3.3.12
résistance à la pression interne
aptitude à supporter la mise sous pression interne hydrostatique ou par gaz
3.3.13
rigidité annulaire
résistance d’un tube à la déformation diamétrale en réponse à un chargement externe appliqué le long
d’un plan diamétral longitudinal
Note 1 à l’article : Cette définition s’applique à la fois aux valeurs à court terme et à long terme.
3.3.14
ovalisation
différence entre le diamètre extérieur maximal et le diamètre extérieur minimal mesurés dans le même
plan transversal du tuyau
3.3.15
rayon de courbure minimal
rayon minimal en un point quelconque de la longueur de canalisation, mesuré par rapport à l’axe
longitudinal de celle-ci
Note 1 à l’article : Il est généralement exprimé en multiple du diamètre du tuyau.
3.3.16
limite inférieure de confiance de la résistance hydrostatique prévue
σ
LPL
ISO/DIS 11301‐1:2025(fr)
grandeur ayant la dimension d’une contrainte, qui représente la limite inférieure de confiance à 97,5 %
de la résistance hydrostatique prévue à une température θ et un temps t
Note 1 à l’article : Elle est exprimée en mégapascals.
3.3.17
indice de fluidité à chaud en masse
MFR
valeur se rapportant à la viscosité d’un matériau en fusion à une température et à une charge spécifiées
Note 1 à l’article : Il est exprimé en grammes par 10 min (g/10 min).
[SOURCE : ISO 4437-1:2024, 3.3.5]
3.3.18
résistance minimale requise
MRS
valeur de la limite inférieure de confiance de la résistance hydrostatique prévue (σ ) (3.3.16) à une
LPL
température de 20 °C et pour une durée de vie de 50 ans, arrondie à la valeur inférieure la plus proche
de la série R10 ou de la série R20
Note 1 à l’article : Seules les compositions (3.2.1) avec une MRS de 8 MPa ou de 10 MPa sont spécifiées dans le
présent document.
Note 2 à l’article : La série R10 et la série R20 sont conformes à l’ISO 3.
Note 3 à l’article : Elle est exprimée en mégapascals (MPa).
[SOURCE : ISO 4437-1:2024, 3.3.2]
3.3.19
temps d’induction à l’oxydation
OIT
mesure relative de la résistance du matériau stabilisé à la décomposition par oxydation, déterminée par
le mesurage calorimétrique de l’intervalle de temps au début de l’oxydation exothermique du matériau à
une température spécifiée dans une atmosphère d’oxygène ou d’air à la pression atmosphérique
3.4 Termes relatifs aux stades des produits
Les caractéristiques des composants utilisés pour la rénovation et les matières à partir desquelles ces
composants sont fabriqués peuvent être distinguées suivant deux stades distincts, comme suit :
3.4.1
stade « M »
stade tel que fabriqué, c’est-à-dire avant toute transformation ultérieure des composants sur site associée
à la technique de rénovation particulière
Note 1 à l’article : Pour les tubes et raccords au stade « M », voir respectivement les Articles 5 et 6.
3.4.2
stade « I »
stade tel qu’installé, c’est-à-dire lors de la configuration finale après toute transformation des composants
sur site associée à la technique de rénovation particulière
Note 1 à l’article : Pour les tubes et raccords au stade « I », voir l’Article 8.
ISO/DIS 11301‐1:2025(fr)
3.5 Termes relatifs aux matières
3.5.1
matière vierge
matière sous forme de granulés, de poudre ou de liquide, qui n’a pas été utilisée ni traitée autrement que
pour les besoins de sa fabrication, et à laquelle il n’a été ajouté aucune matière retraitée ou régénérée
3.5.2
matière retraitable interne
matière provenant de tubes, de raccords ou de robinets propres non utilisés, rejetés, y compris des chutes
provenant de la fabrication de tubes, raccords ou robinets, qui sera retraitée dans l’usine du fabricant
après avoir été préalablement traitée par le même fabricant au cours de la production de composants par
un procédé comme le moulage par injection ou l’extrusion
3.5.3
matière retraitable externe
matière provenant de produits ou de chutes non utilisés, qui sera retraitée et qui a été à l’origine traitée
par un autre fabricant
Note 1 à l’article : Si un fabricant a une production autre que celle de tubes et de raccords, les matières retraitables
issues de cette production sont considérées comme des matières retraitables externes lorsqu’elles sont utilisées
pour la production de tubes ou de raccords.
3.5.4
matière régénérée
matière préparée à partir de produits déjà utilisés qui ont été nettoyés et écrasés ou broyés
3.5.5
composition
mélange extrudé homogène du polymère de base (polyéthylène) et d’additifs (à savoir, antioxydants,
pigments, noir de carbone, stabilisants UV et autres), en quantité nécessaire pour la transformation et
l’utilisation des composants
[SOURCE : ISO 4437-1:2024, 3.2.3]
3.5.7
fissuration
phénomène microstructural associé à l’application à court terme d’une contrainte de flexion en traction
dépassant la contrainte critique d’élasticité propre au matériau
3.5.8
boue de forage
fluide créé par mélange d’eau et d’additifs pour faciliter le forage et le transport des déblais de forage du
trépan à la surface
3.6 Termes relatifs aux conditions de service
3.6.1
pression nominale
PN
désignation numérique, qui est un nombre rond pratique, utilisée à des fins de référence
Note 1 à l’article : Pour les systèmes de canalisations plastiques transportant du gaz, elle correspond à la pression
maximale de service en continu, exprimée en bar, pouvant être supportée avec de l’eau à 20 °C, en fonction du
coefficient de calcul minimal.
ISO/DIS 11301‐1:2025(fr)
[SOURCE : ISO 17885:2021, 3.1.10]
3.6.2
pression maximale de service
MOP
pression effective maximale du gaz dans le système de canalisation, exprimée en bar , qui est admise en
utilisation continue
Note 1 à l’article : Elle tient compte des caractéristiques physiques et mécaniques des composants du système de
canalisations (et de l’influence du gaz sur ces caractéristiques) et est calculée en utilisant la formule suivante :
20 MRS
MOP=
CSDR 1
[SOURCE : ISO 17885:2021, 3.1.11]
3.6.3
coefficient de calcul
C
coefficient d’une valeur supérieure à 1, qui tient compte à la fois des conditions de service et des
propriétés des composants d’un système de canalisations autres que celles qui sont prises en compte
dans la limite inférieure de confiance de la résistance hydrostatique prévue
[SOURCE : ISO 4437-1:2024, 3.3.3]
3.7 Termes relatifs aux assemblages
3.7.1
assemblage par soudage bout à bout
assemblage réalisé par chauffage des extrémités planes des tuyaux, dont les surfaces qui coïncident sont
soudées en les maintenant contre une plaque chauffante plane jusqu’à ce que la matière polyéthylène
atteigne la température de fusion, en retirant rapidement la plaque chauffante et en appliquant les deux
extrémités ramollies l’une contre l’autre
3.7.2
assemblage électrosoudable
assemblage entre un raccord à emboîture électrosoudable ou une selle électrosoudable en polyéthylène et
un tuyau ou un raccord à bouts mâles, réalisé en chauffant les raccords électrosoudables par effet Joule
de l’élément chauffant incorporé au niveau de leurs surfaces de raccordement, ce qui provoque la fusion
du matériau/de la matière adjacent(e) et le soudage des surfaces du t
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