SIST EN ISO 11301-1:2026
(Main)Piping systems for rehabilitation of underground gas supply networks - Part 1: Polyethylene (PE) material (ISO 11301-1:2026)
General Information
- Abstract
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, 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 minimum required strength (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.
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.
- Status
- Published
- Public Enquiry End Date
- 18-May-2025
- Publication Date
- 24-Aug-2026
- Technical Committee
- PCV - Plastic pipes, fittings and valves
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 11-Aug-2026
- Due Date
- 16-Oct-2026
- Completion Date
- 25-Aug-2026
Overview
SIST EN ISO 11301-1:2026 is an international standard that outlines the requirements and test methods for polyethylene (PE) pipes, fittings, and assemblies used in the rehabilitation of underground gas supply networks. Published by SIST, this standard is essential for gas industry professionals, utility companies, and contractors specializing in the renovation and trenchless replacement of gas pipelines. The document is directly applicable to the materials "as manufactured" and "as installed," but does not apply to the existing pipeline infrastructure itself.
The standard covers PE solid wall single-layer pipes, PE pipes with co-extruded layers, and PE coated pipes, in addition to specifying requirements for various renovation and trenchless replacement techniques. Its scope ensures consistency, safety, and performance for underground gas supply network rehabilitation projects.
Key Topics
- Material Requirements: Specifications for PE pipes and fittings, including solid wall and co-extruded types, ensuring durability and compatibility for gas supply systems.
- Test Methods: Standardized procedures for evaluating dimensions, mechanical properties, and integrity of PE piping materials and assemblies.
- Renovation Techniques: Includes guidelines for lining methods:
- Lining with continuous pipes
- Lining with close-fit pipes
- Trenchless Replacement Techniques: Addresses advanced installation techniques:
- Pipe bursting and pipe extraction
- Horizontal directional drilling (HDD) and impact moling
- Jointing Methods: Requirements for butt fusion, electrofusion, mechanical connections, and fabricated/injection-moulded fittings.
- Installation Practice: Recommendations for handling, storage, and installation of pipes and fittings in real-world scenarios.
Applications
SIST EN ISO 11301-1:2026 is a crucial resource for various sectors involved in the maintenance and upgrading of underground gas supply networks. Key applications include:
- Gas Utilities and Network Operators: Ensures standardized, safe rehabilitation of gas pipelines with minimum service interruptions.
- Engineering and Construction Firms: Provides guidelines for selecting appropriate PE piping materials and installation techniques for gas network renovations.
- Contractors Specialized in Trenchless Technology: Supports innovative, minimally invasive methods to replace or upgrade buried gas pipelines using pipe bursting, pipe extraction, HDD, or impact moling.
- Quality Assurance and Compliance: Establishes performance criteria that facilitate regulatory compliance and long-term reliability of newly installed or renovated gas pipelines.
- Project Planning and Design: Designers can specify PE material pipes, jointing methods, and installation technologies according to international best practices, ensuring project efficiency and safety.
Related Standards
The following standards are referenced, ensuring comprehensive alignment within the gas supply and plastics piping system sector:
- ISO 4437 Series: Plastics piping systems for the supply of gaseous fuels (PE) - General, pipes, fittings, valves, and fitness for purpose.
- ISO 12176 Series: Equipment for fusion jointing polyethylene systems - Butt fusion and electrofusion.
- EN 1555 Series: Similar content as ISO 4437, focused on PE piping for gaseous fuels.
- ISO 3126: Plastics piping systems - Determination of dimensions.
- ISO 16010 & EN 682: Material requirements for elastomeric seals in pipes and fittings for gas and hydrocarbon fluids.
- ISO 11299 and ISO 21225 Series: Previous standards for renovation and trenchless replacement of underground gas pipelines, now largely replaced by ISO 11301-1.
Practical Value
By implementing SIST EN ISO 11301-1:2026, stakeholders benefit from:
- Improved Safety: Uniform standards for PE piping materials reduce the risk of failures and ensure gas network integrity.
- Enhanced Durability: Specified material and installation requirements promote long-term service life of rehabilitated pipelines.
- Cost Efficiency: Supports advanced, less disruptive trenchless techniques that minimize excavation and restoration costs.
- Standardized Processes: Harmonization with European and international standards streamlines project approvals and cross-border infrastructure projects.
- Sustainability: Encourages less invasive rehabilitation practices, minimizing environmental impact compared to conventional open-trench methods.
In summary, SIST EN ISO 11301-1:2026 is an essential reference for any professional rehabilitating underground gas supply networks using polyethylene pipes, ensuring safety, efficiency, and compliance with best international practices.
Relations
- Effective Date
- 02-Sep-2026
- Effective Date
- 05-Aug-2026
- Effective Date
- 09-Aug-2023
- Effective Date
- 09-Aug-2023
- Effective Date
- 09-Aug-2023
- Effective Date
- 09-Aug-2023
- Effective Date
- 09-Aug-2023
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Frequently Asked Questions
SIST EN ISO 11301-1:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Piping systems for rehabilitation of underground gas supply networks - Part 1: Polyethylene (PE) material (ISO 11301-1:2026)". 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. 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, 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 minimum required strength (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. 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.
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, 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 minimum required strength (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. 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.
SIST EN ISO 11301-1:2026 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; 83.140.30 - Plastics pipes and fittings for non fluid use; 91.140.40 - Gas supply systems. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN ISO 11301-1:2026 has the following relationships with other standards: It is inter standard links to SIST EN 682:2002, SIST EN 14408-1:2005, SIST EN ISO 21225-1:2018, SIST EN ISO 11299-2:2019, SIST EN ISO 11299-3:2019, SIST EN ISO 21225-2:2018, SIST EN ISO 11299-1:2019. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 11301-1:2026 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)
SLOVENSKI STANDARD
01-oktober-2026
Cevni sistemi za obnovo podzemnih omrežij za oskrbo s plinom - 1. del: Polietilen
(PE) (ISO 11301-1:2026)
Piping systems for rehabilitation of underground gas supply networks - Part 1:
Polyethylene (PE) material (ISO 11301-1:2026)
Rohrleitungssysteme für die Sanierung von erdverlegten Gasversorgungsnetzwerken -
Teil 1: Werkstoff Polyethylen (PE) (ISO 11301-1:2026)
Systèmes de canalisations pour la réhabilitation des réseaux de distribution de gaz
enterrés - Partie 1: Matériau Polyéthylène (PE) (ISO 11301-1:2026)
Ta slovenski standard je istoveten z: EN ISO 11301-1:2026
ICS:
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 11301-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2026
EUROPÄISCHE NORM
ICS 23.040.45 Supersedes EN ISO 11299-1:2018, EN ISO 11299-
3:2018, EN ISO 21225-1:2018, EN ISO 21225-2:2018,
EN ISO 11299-2:2018
English Version
Piping systems for rehabilitation of underground gas
supply networks - Part 1: Polyethylene (PE) material (ISO
11301-1:2026)
Systèmes de canalisations pour la réhabilitation des Rohrleitungssysteme für die Sanierung von
réseaux de distribution de gaz enterrés - Partie 1: erdverlegten Gasversorgungsnetzwerken - Teil 1:
Matériau Polyéthylène (PE) (ISO 11301-1:2026) Werkstoff Polyethylen (PE) (ISO 11301-1:2026)
This European Standard was approved by CEN on 25 May 2026.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11301-1:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 11301-1:2026) has been prepared by Technical Committee ISO/TC 138
"Plastics pipes, fittings and valves for the transport of fluids" in collaboration with Technical Committee
CEN/TC 155 “Plastics piping systems and ducting systems” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2027, and conflicting national standards shall
be withdrawn at the latest by January 2027.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 11299-1:2018, EN ISO 11299-3:2018, EN ISO 21225-1:2018,
EN ISO 21225-2:2018 and EN ISO 11299-2:2018.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 11301-1:2026 has been approved by CEN as EN ISO 11301-1:2026 without any
modification.
International
Standard
ISO 11301-1
First edition
Piping systems for rehabilitation
2026-07
of underground gas supply
networks —
Part 1:
Polyethylene (PE) material
Systèmes de canalisations pour la réhabilitation des réseaux de
distribution de gaz enterrés —
Partie 1: Matériau Polyéthylène (PE)
Reference number
ISO 11301-1:2026(en) © ISO 2026
ISO 11301-1:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 11301-1:2026(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 .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
ISO 11301-1:2026(en)
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
ISO 11301-1:2026(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 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
ISO 11301-1:2026(en)
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 5: 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
ISO 11301-1:2026(en)
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
ISO 11301-1:2026(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
viii
International Standard ISO 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.
ISO 11301-1:2026(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, 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)
ISO 11301-1:2026(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
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)
ISO 11301-1:2026(en)
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
ISO 11301-1:2026(en)
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
ISO 11301-1:2026(en)
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]
ISO 11301-1:2026(en)
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]
ISO 11301-1:2026(en)
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
...