EN ISO 11300-3:2026

Piping systems for rehabilitation of underground drains, sewers and water supply networks - Part 3: Unplasticized poly (vinyl chloride) (PVC-U) material (ISO 11300-3:2026)

This document specifies requirements and test methods for pipes and fittings which are part of piping systems for the rehabilitation of non-pressure underground drains and sewers.
NOTE            It is not applicable to use of PVC-U material for rehabilitation of pipes under pressure.
It is applicable to unplasticized poly (vinyl chloride) (PVC-U) pipes, fittings and assemblies, as manufactured and as installed with service temperature not exceeding 35 °C. It is not applicable to the existing pipeline.
This document is applicable to the renovation technique family “lining with close-fit pipes”.

Rohrleitungssysteme für die Sanierung von unterirdischen Entwässerungs-, Kanalisations- und Wasserversorgungsnetzen - Teil 3: Weichmacherfreies Poly(vinylchlorid) (PVC-U) (ISO 11300-3:2026)

Dieses Dokument legt Anforderungen an und Prüfverfahren für Rohre und Formstücke fest, die Teil von Rohrleitungssystemen für die Sanierung von drucklosen unterirdischen Entwässerungsleitungen und Abwasserleitungen sind.
ANMERKUNG   Es gilt nicht für die Verwendung von PVC U-Werkstoff für die Sanierung von Druckleitungen.
Es gilt für Rohrleitungen, Formstücke und Baugruppen aus weichmacherfreiem Polyvinylchlorid (PVC U) wie hergestellt und wie eingebaut bei einer Betriebstemperatur von bis zu 35 °C. Es gilt nicht für die vorhandene Rohrleitung.
Dieses Dokument gilt für die Sanierungstechnikfamilie „Close-Fit-Lining“.

Systèmes de canalisations pour la réhabilitation des branchements, des collecteurs d’assainissement et des réseaux d’alimentation en eau enterrés - Partie 3: Matériau poly(chlorure de vinyle) non plastifié (PVC-U) (ISO 11300-3:2026)

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 de branchements et de collecteurs d’assainissement enterrés sans pression.
NOTE            L'utilisation de PVC-U n'est pas applicable à la réhabilitation de canalisations sous pression.
Il est applicable aux tubes, raccords et assemblages en poly(chlorure de vinyle) non plastifié (PVC-U), tels que fabriqués et tels qu’installés avec une température de service ne dépassant pas 35 °C. Il n’est pas applicable à la canalisation existante.
Le présent document s’applique à la familles de techniques de rénovation «tubage par tuyau continu sans espace annulaire».

Cevni sistemi za obnovo podzemnih odtokov, kanalizacije in vodovodnih omrežij - 3. del: Nemehčan polivinilklorid (PVC-U) (ISO 11300-3:2026)

Ta dokument določa zahteve in preskusne metode za cevi in fitinge, ki so del cevnih sistemov za sanacijo gravitacijskih podzemnih kanalizacijskih odtokov in kanalov.
OPOMBA            Ni uporabno za uporabo materiala PVC-U za sanacijo cevi pod tlakom.
Uporablja se za neplastificirane polivinilkloridne (PVC-U) cevi, fitinge in sklope, kot so izdelani in nameščeni, pri servisni temperaturi, ki ne presega 35 °C. Ne velja za obstoječe cevovode.
Ta dokument je uporaben za družino tehnik prenove "obloga s tesno prilegajočimi se cevmi".

General Information

• Status: Published
• Publication Date: 10-Feb-2026
• ICS: 23.040.20 - Plastics pipes
• ICS: 23.040.45 - Plastics fittings
• ICS: 91.140.80 - Drainage systems
• ICS: 93.025 - External water conveyance systems
• ICS: 93.030 - External sewage systems
• Technical Committee: CEN/TC 155 - Plastics piping systems and ducting systems
• Drafting Committee: CEN/TC 155/WG 17 - Plastic components for the use of renovation of piping systems
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 11-Feb-2026
• Completion Date: 11-Feb-2026
• Ref Project: SIST EN ISO 11300-3:2026 - Piping systems for rehabilitation of underground drains, sewers and water supply networks - Part 3: Unplasticized poly (vinyl chloride) (PVC-U) material (ISO 11300-3:2026)

Relations

• Replaces: EN ISO 11296-1:2018 - Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 1: General (ISO 11296-1:2018)
• Effective Date: 13-Mar-2024
• Replaces: EN ISO 11296-3:2018 - Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 3: Lining with close-fit pipes (ISO 11296-3:2018)
• Effective Date: 13-Mar-2024
• Consolidated By: ISO 11300-3:2026 - Piping systems for rehabilitation of underground drains, sewers and water supply networks — Part 3: Unplasticized poly (vinyl chloride) (PVC-U) material
• Effective Date: 12-Feb-2026

Overview

EN ISO 11300-3:2026 specifies requirements and test methods for unplasticized poly (vinyl chloride) (PVC-U) pipes, fittings, and assemblies used in the rehabilitation of non-pressure underground drains, sewers, and water supply networks. Developed by CEN in collaboration with ISO, this standard focuses on systems utilizing the “lining with close-fit pipes” technique for renovation projects, defining both the performance criteria and important terminology relevant to these types of projects.

This standard is specifically not applicable to the rehabilitation of pipelines intended to operate under pressure or existing pipelines themselves, and is limited to applications with service temperatures not exceeding 35°C.

Key Topics

• Material Requirements: The standard details the required properties for PVC-U material, specifying the use of virgin material, with clear guidance on the use of reprocessable and recyclable materials. For close-fit lining applications, only materials that ensure consistent quality and reliability are endorsed.

• Pipe and Fitting Characteristics: Pipes and fittings must meet visual and performance requirements both as manufactured (“M” stage) and as installed (“I” stage), including dimensional tolerances, color guidelines, and surface quality. Marking requirements are also provided to guarantee traceability and compliance.

• Test Methods: EN ISO 11300-3:2026 references a range of ISO standards for evaluating mechanical, physical, and geometric characteristics, ensuring pipes and fittings deliver reliable performance after installation.

• Installation Considerations: Guidance is provided for preparatory work, storage, handling, transportation, and equipment requirements. The document states the need for appropriate inspection measures and documentation throughout the installation process.

• Scope of Application: Focus is given to non-pressure applications, especially in rehabilitation projects where close-fit lining is selected, excluding rehabilitation under pressure.

Applications

EN ISO 11300-3:2026 is directly relevant to:

• Municipal Infrastructure Modernization: Used by local authorities and contractors for upgrading and rehabilitating aging underground drainage and sewer networks without the need for full excavation.

• Utility Companies: Water utility providers employ the defined materials and methods for trenchless or minimal-intrusion renewal of pipelines, maximizing operational uptime and minimizing surface disruption.

• Engineering and Construction Firms: Provides standardized criteria for material selection, installation procedures, and conformity assessment, supporting efficient project delivery and compliance with European regulations.

• Asset Management: Ensures long-term reliability and performance of rehabilitated pipeline systems by standardizing product characteristics and installation quality.

Related Standards

EN ISO 11300-3:2026 forms part of a broader family of standards dedicated to pipeline rehabilitation. These include:

• ISO 11300-1: General requirements for rehabilitation of underground piping systems
• ISO 11300-2: Requirements for thermoset composite materials in rehabilitation
• ISO/TS 23818-3: Guidance for the assessment of conformity to the requirements of piping rehabilitation standards
• ISO 11295: Overview and classification of plastics piping systems used for pipeline rehabilitation
• EN 1401-1: Specifications for PVC-U pipes and fittings for non-pressure underground drainage and sewerage

This standard supersedes EN ISO 11296-1:2018 and EN ISO 11296-3:2018, reflecting updated technical requirements and harmonization within the ISO 11300 series.

By adopting EN ISO 11300-3:2026, stakeholders benefit from clear, consistent specifications for PVC-U piping systems, facilitating quality assurance and interoperability in the rehabilitation of underground utilities. This contributes to efficient, durable, and sustainable infrastructure management across Europe and internationally.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2026
Cevni sistemi za obnovo podzemnih odtokov, kanalizacije in vodovodnih omrežij -
3. del: Nemehčan polivinilklorid (PVC-U) (ISO 11300-3:2026)
Piping systems for rehabilitation of underground drains, sewers and water supply
networks - Part 3: Unplasticized poly (vinyl chloride) (PVC-U) material (ISO 11300-
3:2026)
Rohrleitungssysteme für die Sanierung von unterirdischen Entwässerungs-,
Kanalisations- und Wasserversorgungsnetzen - Teil 3: Weichmacherfreies Poly
(vinylchlorid) (PVC-U) (ISO 11300-3:2026)
Systèmes de canalisations pour la réhabilitation des branchements, des collecteurs
d’assainissement et des réseaux d’alimentation en eau enterrés - Partie 3: Matériau poly
(chlorure de vinyle) non plastifié (PVC U) (ISO 11300-3:2026)
Ta slovenski standard je istoveten z: EN ISO 11300-3:2026
ICS:
23.040.05 Cevovodi za zunanje Pipeline and its parts for
sisteme za odpadno vodo in external sewage systems
njihovi deli
91.140.80 Drenažni sistemi Drainage systems
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11300-3
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2026
EUROPÄISCHE NORM
ICS 23.040.20; 23.040.45; 91.140.80; 93.030; 93.025 Supersedes EN ISO 11296-1:2018, EN ISO 11296-
3:2018
English Version
Piping systems for rehabilitation of underground drains,
sewers and water supply networks - Part 3: Unplasticized
poly (vinyl chloride) (PVC-U) material (ISO 11300-3:2026)
Systèmes de canalisations pour la réhabilitation des Rohrleitungssysteme für die Sanierung von
branchements, des collecteurs d'assainissement et des unterirdischen Entwässerungs-, Kanalisations- und
réseaux d'alimentation en eau enterrés - Partie 3: Wasserversorgungsnetzen - Teil 3: Weichmacherfreies
Matériau poly(chlorure de vinyle) non plastifié (PVC- Poly(vinylchlorid) (PVC-U) (ISO 11300-3:2026)
U) (ISO 11300-3:2026)
This European Standard was approved by CEN on 1 February 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 11300-3:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11300-3:2026) 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 August 2026, and conflicting national standards shall
be withdrawn at the latest by August 2026.
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 11296-1:2018 and EN ISO 11296-3:2018.
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 11300-3:2026 has been approved by CEN as EN ISO 11300-3:2026 without any
modification.
International
Standard
ISO 11300-3
First edition
Piping systems for rehabilitation
2026-02
of underground drains, sewers and
water supply networks —
Part 3:
Unplasticized poly (vinyl chloride)
(PVC-U) material
Systèmes de canalisations pour la réhabilitation des
branchements, des collecteurs d’assainissement et des réseaux
d’alimentation en eau enterrés —
Partie 3: Matériau poly(chlorure de vinyle) non plastifié (PVC-U)
Reference number
ISO 11300-3:2026(en) © ISO 2026

ISO 11300-3:2026(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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 11300-3:2026(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General .2
3.2 Terms related to techniques .2
3.3 Terms related to characteristics.3
3.4 Terms related to product stages .4
3.5 Terms related to materials .5
4 Symbols and abbreviated terms. 5
4.1 Symbols .5
4.2 Abbreviated terms .6
5 Pipes . 6
5.1 Materials .6
5.1.1 General .6
5.1.2 Virgin material .6
5.1.3 Reprocessable material and recyclable material .6
5.2 General characteristics .6
5.3 Material characteristics .7
5.4 Geometric characteristics .7
5.5 Mechanical characteristics .7
5.6 Physical characteristics .7
5.7 Jointing.7
5.8 Marking .7
6 Fittings . 8
6.1 General .8
6.2 Marking .8
6.3 Regional requirements for fittings .8
7 Ancillary components . 8
8 Fitness for purpose . 8
8.1 Materials .8
8.2 General characteristics .8
8.3 Geometric characteristics .9
8.4 Mechanical characteristics .9
8.5 Sampling .9
9 Installation practice . 9
9.1 Preparatory work .9
9.2 Storage, handling and transport of pipes and fittings .9
9.3 Equipment .10
9.3.1 General .10
9.3.2 Pipe skids/rollers and pipe entry guides .10
9.3.3 Winching and rod-pulling equipment . .10
9.3.4 Inspection equipment .10
9.3.5 Lifting equipment .10
9.4 Installation .11
9.4.1 General .11
9.4.2 Safety precautions .11
9.4.3 Simulated installations .11
9.5 Process-related inspection and testing . 12
9.6 Pipe end termination . 12

iii
ISO 11300-3:2026(en)
9.7 Reconnection to the existing pipeline system . 12
9.8 Final inspection and testing . 12
9.9 Documentation . 12
Annex A (normative) Additional requirements applicable for lining with Close-fit pipes .13
Annex B (informative) Summary of required elements to be included in installation manuals .18
Bibliography . 19

iv
ISO 11300-3:2026(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 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).
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 11300-3, along with ISO 11300-1, ISO 11300-2 and ISO/DIS 11300-4 (in preparation),
cancels and replaces ISO 11296-1:2018 and ISO 11296-3:2018, which have been technically revised.
The main changes are as follows:
— for piping systems made from unplasticized poly (vinyl chloride) (PVC-U) material, this document
replaces the related content, including requirements, of the documents listed above.
A list of all parts in the ISO 11300 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 11300-3:2026(en)
Introduction
This document is a part of a series of International Standards concerning piping systems of various materials
used for the rehabilitation of existing pipelines in a specified application area:
— ISO 11300 series: Piping systems for rehabilitation of underground drains, sewers and water supply
networks;
— 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
piping system.
The ISO 11300 series is subdivided in four parts:
— Part 1: Polyethylene (PE) material;
— Part 2: Thermoset composite materials;
— Part 3: PVC-U material (this document);
— Part 4: Thermoplastic composite materials.
These documents 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 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]
For assessment of conformity to the requirements of this document, see ISO/TS 23818-3 .

vi
ISO 11300-3:2026(en)
a
In preparation.
Figure 1 — Clause structure of the ISO 11300 series and the ISO 11301 series
The various techniques for rehabilitation of underground drains, sewers and water 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 11300-3:2026(en)
a
This document is applicable, for piping systems made from PVC-U materials.
Figure 2 — Technique families for rehabilitation of underground drains, sewers and water supply
networks using plastics pipes, within the scope of pipeline rehabilitation techniques

viii
International Standard ISO 11300-3:2026(en)
Piping systems for rehabilitation of underground drains,
sewers and water supply networks —
Part 3:
Unplasticized poly (vinyl chloride) (PVC-U) material
1 Scope
This document specifies requirements and test methods for pipes and fittings which are part of piping
systems for the rehabilitation of non-pressure underground drains and sewers.
NOTE It is not applicable to use of PVC-U material for rehabilitation of pipes under pressure.
It is applicable to unplasticized poly (vinyl chloride) (PVC-U) pipes, fittings and assemblies, as manufactured
and as installed with service temperature not exceeding 35 °C. It is not applicable to the existing pipeline.
This document is applicable to the renovation technique family “lining with close-fit pipes”.
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 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion
plastics
ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters
ISO 2507-1, Thermoplastics pipes and fittings — Vicat softening temperature — Part 1: General test method
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method
ISO 4435, Plastics piping systems for non-pressure underground drainage and sewerage — Unplasticized
poly(vinyl chloride) (PVC-U)
ISO 6259-1, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method
ISO 9852, Unplasticized poly(vinyl chloride) (PVC-U) pipes — Dichloromethane resistance at specified
temperature (DCMT) — Test method
ISO 9967, Thermoplastics pipes — Determination of creep ratio
ISO 9969, Thermoplastics pipes — Determination of ring stiffness
ISO 11295, Plastics piping systems used for the rehabilitation of pipelines — Classification and overview of
strategic, tactical and operational activities
ISO 18373-1, Rigid PVC pipes — Differential scanning calorimetry (DSC) method — Part 1: Measurement of the
processing temperature
ISO 11300-3:2026(en)
EN 1401-1, Plastics piping systems for non-pressure underground drainage and sewerage — Unplasticized
poly(vinyl chloride) (PVC-U) – Part 1: Specifications for pipes, fittings and the system
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11295 and the following 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
characteristic
property, dimension or other feature of a material or component
[SOURCE: ISO 11300-1:2026, 3.1.1]
3.1.2
declared value
limiting value of a characteristic (3.1.1) declared in advance by the rehabilitation system supplier (3.1.3),
which becomes the requirement for the purposes of assessment of conformity
[SOURCE: ISO 11300-1:2026, 3.1.2]
3.1.3
rehabilitation system supplier
entity that specifies the field and range of application and brings together the components of a rehabilitation
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 they meet the requirements of the product standard at the “I” stage
(3.4.2)
[SOURCE: ISO 11300-1:2026, 3.1.5]
3.1.4
system installer
entity that prepares the host pipe, takes the rehabilitation system at the “M” stage (3.4.1) and installs it so
that it is at the “I” stage (3.4.2)
[SOURCE: ISO 11300-1:2026, 3.1.6]
3.2 Terms related to techniques
3.2.1
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
[SOURCE: ISO 11295:2026, 3.2.1]
3.2.2
close-fit pipe
continuous lining pipe of thermoplastic material reshaped or otherwise expanded after insertion to achieve
a close fit (3.2.1) to the existing pipeline
[SOURCE: ISO 11295:2026, 3.2.2]

ISO 11300-3:2026(en)
3.2.3
integral joint
joint at the pipe end, either by means of a socket at one pipe end (single-socket pipe) or matching joint parts
integrated in the pipe wall at either end of the pipe (rubber ring joints or screwed joints).
[SOURCE: ISO 11300-1:2026, 3.7.5]
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 11300-1:2026, 3.3.1]
3.3.2
nominal size
DN/OD
nominal size, related to the outside diameter
[SOURCE: ISO 11300-1:2026, 3.3.2]
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
[SOURCE: ISO 11300-1:2026, 3.3.3]
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 11300-1:2026, 3.3.4]
3.3.5
minimum mean outside diameter
d
em,min
minimum value of the mean outside diameter (3.3.4) as specified for a given nominal size
[SOURCE: ISO 11300-1:2026, 3.3.5]
3.3.6
wall thickness
e
value of the measurement of the wall thickness at any point around the circumference of a component
[SOURCE: ISO 11300-1:2026, 3.3.6]

ISO 11300-3:2026(en)
3.3.7
mean wall thickness
e
m
arithmetic mean of a number of measurements of the wall thickness (3.3.6), 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 11300-1:2026, 3.3.7]
3.3.8
minimum wall thickness at any point
e
min
minimum value of the wall thickness (3.3.6) at any point around the circumference of a component, as
specified
[SOURCE: ISO 11300-1:2026, 3.3.8]
3.3.9
nominal wall thickness
e
n
numerical designation of the wall thickness (3.3.6) 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 ISO 4435 or the different parts of the ISO 4427 series,
the value of nominal wall thickness, e , is identical to the specified minimum wall thickness at any point (3.3.8), e .
n min
[SOURCE: ISO 11300-1:2026, 3.3.9]
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 (3.3.3), d , and the nominal wall thickness (3.3.9), e
n n
[SOURCE: ISO 11300-1:2026, 3.3.11]
3.
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