SIST EN ISO 11295:2022

Plastics piping systems used for the rehabilitation of pipelines - Classification and overview of strategic, tactical and operational activities (ISO 11295:2022)

This document specifies the steps of the overall process of pipeline rehabilitation, comprising:
— information on strategic and tactical activities:
a) investigation and condition assessment of the existing pipeline;
b) pipeline rehabilitation planning.
— information on and requirements for operational activities:
c) project specification;
d) applications of techniques;
e) documentation of the design and application process.
Definitions and classification of families of renovation and trenchless replacement techniques are
provided, and their respective features described. Areas of application covered include underground
drainage and sewerage networks and underground water and gas supply networks.
The following aspects are not covered by the scope of this document:
— new construction provided as network extensions;
— calculation methods to determine, for each viable technique, the characteristics of lining or
replacement pipe material needed to secure the desired performance of the rehabilitated pipeline;
— techniques providing non-structural pressure pipe liners;
— techniques for local repair.
It is the responsibility of the designer to choose and design the renovation or trenchless replacement
pipeline system.

Kunststoff-Rohrleitungssysteme, die für die Sanierung verwendet werden - Klassifizierung und Überblick über strategische und operative Aktivitäten (ISO 11295:2022)

Dieses Dokument legt die Schritte des Gesamtprozesses der Rohrleitungssanierung fest, bestehend aus:
—   Informationen zu strategischen und taktischen Aktivitäten:
a)   Untersuchung und Zustandsbeurteilung der vorhandenen Rohrleitung;
b)   Sanierungsplanung der Rohrleitung.
—   Informationen zu und Anforderungen an operative Aktivitäten:
c)   Maßnahmenplanung;
d)   Einzusetzende Verfahren und Methoden;
e)   Dokumentation des Planungs- und Anwendungsprozesses.
Definitionen und die Klassifizierung von Technikfamilien für die Sanierung und grabenlose Erneuerung sind enthalten, einschließlich einer Beschreibung ihrer jeweiligen Merkmale. Die behandelten Anwendungs¬bereiche beinhalten erdverlegte Entwässerungs- und Abwassernetze und erdverlegte Wasser- und Gas¬versorgungsnetze.
Die folgenden Aspekte sind durch den Anwendungsbereich dieses Dokuments nicht abgedeckt:
—   Rohrleitungsneubauten zur Netzerweiterung;
—   Berechnungsverfahren zur Bestimmung der Eigenschaften von Lining- oder Ersatzrohrwerkstoff für jedes praktikable Verfahren, die notwendig sind, um die gewünschte Leistungsfähigkeit der erneuerten Rohr¬leitung sicherzustellen;
—   Verfahren der Bereitstellung von nicht statisch belastbaren Druckleitungs-Linern;
—   Verfahren zur punktuellen Reparatur.
Es liegt in der Verantwortung des Planers, ein Rohrleitungssystem zur Renovierung oder grabenlosen Erneuerung auszuwählen und zu planen.

Systèmes de canalisation en plastique destinés à la réhabilitation des réseaux enterrés - Classification et vue d’ensemble des activités stratégiques, tactiques et opérationnelles (ISO 11295:2022)

Le présent document spécifie les étapes du processus global de réhabilitation des canalisations, comprenant:
—    des informations sur les activités stratégiques et tactiques:
a) inspection et évaluation de l'état de la canalisation existante;
b) planification de la réhabilitation de la canalisation.
—    informations sur les activités opérationnelles et leurs exigences:
c) spécification du projet;
d) application des techniques;
e) documentation du processus de conception et d'application.
Les définitions et la classification des familles de techniques de rénovation et de remplacement sans tranchée sont fournies, et leurs caractéristiques respectives décrites. Les domaines d'application couverts comprennent les réseaux les branchements et les collecteurs d'assainissement enterrés et les réseaux enterrés d'approvisionnement en eau et en gaz.
Les aspects suivants ne sont pas couverts par le domaine d'application du présent document:
—    nouvelle construction prévue comme extension du réseau;
—    méthodes de calcul permettant de déterminer, pour chaque technique viable, les caractéristiques du matériau du tubage ou de remplacement des canalisations nécessaires pour garantir la performance souhaitée de la canalisation réhabilitée;
—    techniques permettant de fournir des revêtements non structuraux pour les tubes sous pression;
—    techniques de réparation locale.
Il est de la responsabilité du concepteur de choisir et de concevoir le système de canalisation de rénovation ou de remplacement sans tranchée.

Cevni sistemi iz polimernih materialov za obnovo cevovodov - Razvrstitev in pregled strateških, taktičnih in operativnih dejavnosti (ISO 11295:2022)

Ta dokument določa korake celotnega postopka obnove cevovodov in zajema:
– informacije o strateških in taktičnih dejavnostih:
a) pregled in ocena stanja obstoječega cevovoda;
b) načrtovanje obnove cevovoda;
– informacije o operativnih dejavnostih in povezane zahteve:
c) specifikacija projekta;
d) uporaba tehnik;
e) dokumentacija postopka načrtovanja in uporabe.
Podane so definicije in klasifikacija družin tehnik za obnovo in zamenjavo brez izkopa
ter opisane so njihove ustrezne značilnosti. Področja uporabe zajemajo podzemna
omrežja za odvodnjavanje in kanalizacijo ter podzemna omrežja za oskrbo z vodo in s plinom.
Naslednji vidiki ne spadajo na področje uporabe tega dokumenta:
– nova gradnja v okviru razširitev omrežja;
– računske metode za določanje (za vsako izvedljivo tehniko) značilnosti oblog ali
nadomestnega materiala za cevi, ki je potreben za zagotovitev želene učinkovitosti obnovljenega cevovoda;
– tehnike, ki zagotavljajo nekonstrukcijske obloge cevi pod tlakom;
– tehnike za lokalna popravila.
Načrtovalec je odgovoren za izbiro in načrtovanje sistema za obnovo ali zamenjavo cevovodov
brez izkopa.

General Information

• Status: Published
• Public Enquiry End Date: 24-Mar-2021
• Publication Date: 24-Mar-2022
• ICS: 23.040.01 - Pipeline components and pipelines in general
• Technical Committee: PCV - Plastic pipes, fittings and valves
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 16-Mar-2022
• Due Date: 21-May-2022
• Completion Date: 25-Mar-2022
• Ref Project: EN ISO 11295:2022 - Plastics piping systems used for the rehabilitation of pipelines - Classification and overview of strategic, tactical and operational activities (ISO 11295:2022)

Relations

• Replaces: SIST EN ISO 11295:2018 - Classification and information on design and applications of plastics piping systems used for renovation and replacement (ISO 11295:2017)
• Effective Date: 01-May-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 11295:2022
01-maj-2022
Nadomešča:
SIST EN ISO 11295:2018
Cevni sistemi iz polimernih materialov za obnovo cevovodov - Razvrstitev in
pregled strateških, taktičnih in operativnih dejavnosti (ISO 11295:2022)
Plastics piping systems used for the rehabilitation of pipelines - Classification and
overview of strategic, tactical and operational activities (ISO 11295:2022)
Kunststoff-Rohrleitungssysteme, die für die Sanierung verwendet werden -
Klassifizierung und Überblick über strategische und operative Aktivitäten (ISO
11295:2022)
Systèmes de canalisation en plastique destinés à la réhabilitation des réseaux enterrés -
Classification et vue d’ensemble des activités stratégiques, tactiques et opérationnelles
(ISO 11295:2022)
Ta slovenski standard je istoveten z: EN ISO 11295:2022
ICS:
23.040.01 Deli cevovodov in cevovodi Pipeline components and
na splošno pipelines in general
SIST EN ISO 11295:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11295:2022

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SIST EN ISO 11295:2022


EN ISO 11295
EUROPEAN STANDARD

NORME EUROPÉENNE

February 2022
EUROPÄISCHE NORM
ICS 23.040.01 Supersedes EN ISO 11295:2017
English Version

Plastics piping systems used for the rehabilitation of
pipelines - Classification and overview of strategic, tactical
and operational activities (ISO 11295:2022)
Systèmes de canalisation en plastique destinés à la Kunststoff-Rohrleitungssysteme, die für die Sanierung
réhabilitation des réseaux enterrés - Classification et verwendet werden - Klassifizierung und Überblick
vue d'ensemble des activités stratégiques, tactiques et über strategische und operative Aktivitäten (ISO
opérationnelles (ISO 11295:2022) 11295:2022)
This European Standard was approved by CEN on 26 December 2021.

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, Turkey 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11295:2022 E
worldwide for CEN national Members.

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SIST EN ISO 11295:2022
EN ISO 11295:2022 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 11295:2022
EN ISO 11295:2022 (E)
European foreword
This document (EN ISO 11295:2022) 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 2022, and conflicting national standards shall
be withdrawn at the latest by August 2022.
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 11295:2017.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 11295:2022 has been approved by CEN as EN ISO 11295:2022 without any modification.

3

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SIST EN ISO 11295:2022

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SIST EN ISO 11295:2022
INTERNATIONAL ISO
STANDARD 11295
Third edition
2022-01
Plastics piping systems used for
the rehabilitation of pipelines —
Classification and overview of
strategic, tactical and operational
activities
Systèmes de canalisation en plastique destinés à la réhabilitation
des réseaux enterrés — Classification et vue d’ensemble des activités
stratégiques, tactiques et opérationnelles
Reference number
ISO 11295:2022(E)
© ISO 2022

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SIST EN ISO 11295:2022
ISO 11295:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
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 2022 – All rights reserved

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SIST EN ISO 11295:2022
ISO 11295:2022(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General terms . 2
3.2 Terms related to techniques . 3
3.3 Terms related to services conditions . 5
4 Abbreviated terms . 5
5 Pipeline rehabilitation process .6
6 Investigation and condition assessment of the existing pipeline .6
6.1 Performance criteria . 6
6.1.1 General . 6
6.1.2 Hydraulic requirements . 8
6.1.3 Structural requirements . 8
6.1.4 Environmental requirement . 8
6.1.5 Operational requirements . 8
6.2 Investigation of performance . 9
6.2.1 General . 9
6.2.2 Hydraulic investigation . 10
6.2.3 Structural investigation . . 10
6.2.4 Environmental investigation . . 11
6.2.5 Operational investigation . 11
6.3 Condition assessment . 11
6.4 Risk analysis .12
6.5 Control measures . 12
7 Classification and characteristics of rehabilitation techniques .13
7.1 Overview . 13
7.2 Classification of renovation techniques . 14
7.2.1 General . 14
7.2.2 Lining with continuous pipes . 14
7.2.3 Lining with close-fit pipes . 16
7.2.4 Lining with cured-in-place pipes . 19
7.2.5 Lining with discrete pipes . 23
7.2.6 Lining with adhesive-backed hoses. 26
7.2.7 Lining with spirally-wound pipes .28
7.2.8 Lining with pipe segments . 31
7.2.9 Lining with a rigidly anchored plastics inner layer . 32
7.2.10 Lining with sprayed polymeric materials . .34
7.2.11 Lining with inserted hoses .36
7.3 Classification of trenchless replacement techniques . 37
7.3.1 General . 37
7.3.2 Pipe bursting.38
7.3.3 Pipe removal .40
7.3.4 Horizontal directional drilling (HDD) . 42
7.3.5 Impact moling . 45
7.3.6 Pipe jacking . 47
8 Selection of rehabilitation techniques .50
8.1 General .50
8.2 Pipeline system layout .50
8.3 Hydraulic performance . 51
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© ISO 2022 – All rights reserved

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SIST EN ISO 11295:2022
ISO 11295:2022(E)
8.4 Structural performance . 52
8.4.1 General . 52
8.4.2 Non-pressure pipes . 52
8.4.3 Pressure pipes .53
8.5 Environmental impact . 56
8.6 Construction constraints . 57
8.7 Project specification . 57
9 Implementation of rehabilitation techniques .58
9.1 Preconstruction activities . .58
9.2 Assessment of conformity of products . 59
9.3 Inspection, storage and handling of the materials on site . 59
9.4 Application of rehabilitation technique . 59
9.4.1 Preparatory work . 59
9.4.2 Construction.60
9.5 Acceptance control .60
9.5.1 General .60
9.5.2 Inspection .60
9.5.3 Leak tightness testing . 61
9.5.4 Sampling . 62
9.6 Completion of the work . 62
9.6.1 Finishing off the rehabilitation work . 62
9.6.2 Lateral reinstatement . 62
9.7 Documentation of the process . 62
Bibliography .64
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SIST EN ISO 11295:2022
ISO 11295:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation 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 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 third edition cancels and replaces the second edition (ISO 11295:2017), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— Title is renewed from “Classification and information on design and applications of plastics piping
systems used for renovation and replacement” to “Plastics piping systems used for the rehabilitation of
pipelines — Classification and overview of strategic, tactical and operational activities”;
— Clause 5 has been added, describing the whole process of pipeline rehabilitation with references to
the other clauses for further details;
— Clause 6 has been added, dealing with the strategic and tactical activities necessary to decide
whether to rehabilitate; parts of the content of the former Clause 8 are included in this new clause;
— Former Clauses 5, 6 and 7 have been combined into Clause 7 with largely unchanged content;
— Clause 8 has been added, outlining the further tactical and operational steps needed to specify the
rehabilitation project; parts of the content of the former Clauses 8 and 9 are included;
— Clause 9 still covers installation aspects but has been revised to include content on acceptance
control.
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 2022 – All rights reserved

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SIST EN ISO 11295:2022
ISO 11295:2022(E)
Introduction
Pipeline systems are continuously required to satisfy physical, chemical, biochemical and biological
demands. These demands depend on planning, material, construction, type and period of use.
When pipeline systems become operational, they constitute a valuable asset to the network owner,
requiring adequate management, including monitoring the performance of the pipeline system. For
general guidelines and requirements on asset management, ISO 55000, ISO 55001 and ISO 55002 are
applicable.
For the specific case of pipelines for water supply and wastewater collection, detailed information on
the overall management of the networks is provided by ISO 24516-1 and ISO 24516-3.
In the case of loss of performance of a pipeline system, reactive measures initially focus on improving
regular maintenance procedures, including cleaning. In case of deterioration or other serious defects,
more stringent measures to rehabilitate the pipeline become necessary.
Rehabilitation is carried out when there is a need to restore or upgrade the performance of a
pipeline system. Rehabilitation can consist of repair, renovation or replacement. In recent years, the
rehabilitation of pipeline systems has become increasingly important and will continue to be so.
This document provides information on the design process when considering rehabilitation of an
existing pipeline, in order of sequence:
a) investigation and assessment of the deficiencies of current performance of the existing pipeline;
b) determination of viable options, based on performance criteria and process-related factors;
c) specification of the selected type of technique and the required pipe material;
d) the installation;
e) testing the performance.
The techniques used for the renovation and trenchless replacement of existing pipelines are classified
in technique families and the typical characteristics of each are described in general terms.
vi
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SIST EN ISO 11295:2022
INTERNATIONAL STANDARD ISO 11295:2022(E)
Plastics piping systems used for the rehabilitation of
pipelines — Classification and overview of strategic,
tactical and operational activities
1 Scope
This document specifies the steps of the overall process of pipeline rehabilitation, comprising:
— information on strategic and tactical activities:
a) investigation and condition assessment of the existing pipeline;
b) pipeline rehabilitation planning.
— information on and requirements for operational activities:
c) project specification;
d) applications of techniques;
e) documentation of the design and application process.
Definitions and classification of families of renovation and trenchless replacement techniques are
provided, and their respective features described. Areas of application covered include underground
drainage and sewerage networks and underground water and gas supply networks.
The following aspects are not covered by the scope of this document:
— new construction provided as network extensions;
— calculation methods to determine, for each viable technique, the characteristics of lining or
replacement pipe material needed to secure the desired performance of the rehabilitated pipeline;
— techniques providing non-structural pressure pipe liners;
— techniques for local repair.
It is the responsibility of the designer to choose and design the renovation or trenchless replacement
pipeline system.
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 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1043-1 and the following
apply.
1
© ISO 2022 – All rights reserved

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SIST EN ISO 11295:2022
ISO 11295:2022(E)
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 terms
3.1.1
assessment
process, or result of this process, comparing a specified subject matter to relevant references
3.1.2
design working life
assumed period for which a structure or part of it is to be used for its intended purpose with anticipated
repair (3.1.7) and maintenance (3.1.11) but without renovation (3.1.6) or replacement (3.1.8) being
necessary
3.1.3
hazard
condition of water, or biological, chemical, physical or radiological agent with the potential to cause
harm to public health
Note 1 to entry: Condition includes quantity.
[SOURCE: EN 15975-1:2011+A1: 2015, 2.6; modified]
3.1.4
pipeline system
interconnecting pipe network for the conveyance of fluids
[SOURCE: ISO 11298-1:2018, 3.1.1]
3.1.5
rehabilitation
measures f
...

SLOVENSKI STANDARD
oSIST prEN ISO 11295:2021
01-marec-2021
Cevni sistemi iz polimernih materialov za obnovo cevovodov - Razvrstitev in
pregled strateških in operativnih dejavnosti (ISO/DIS 11295:2021)
Plastics piping systems used for the rehabilitation of pipelines - Classification and
overview of strategic and operational activities (ISO/DIS 11295:2021)
Kunststoff-Rohrleitungssysteme, die für die Sanierung verwendet werden -
Klassifizierung und Überblick über strategische und operative Aktivitäten (ISO/DIS
11295:2021)
Systèmes de canalisation en plastique destinés à la réhabilitation des réseaux enterrés -
Classification et vue d’ensemble des activités stratégiques et opérationnelles (ISO/DIS
11295:2021)
Ta slovenski standard je istoveten z: prEN ISO 11295
ICS:
23.040.01 Deli cevovodov in cevovodi Pipeline components and
na splošno pipelines in general
oSIST prEN ISO 11295:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 11295:2021

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oSIST prEN ISO 11295:2021
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11295
ISO/TC 138/SC 8 Secretariat: JISC
Voting begins on: Voting terminates on:
2021-02-01 2021-04-26
Plastics piping systems used for the rehabilitation of
pipelines — Classification and overview of strategic and
operational activities
Systèmes de canalisation en plastique destinés à la réhabilitation des réseaux enterrés — Classification et
vue d’ensemble des activités stratégiques et opérationnelles
ICS: 23.040.01; 23.040.01
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 11295:2021(E)
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. ISO 2021

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oSIST prEN ISO 11295:2021
ISO/DIS 11295:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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 2021 – All rights reserved

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oSIST prEN ISO 11295:2021
ISO/DIS 11295:2021(E)

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
3.1 General . 2
3.2 Techniques . 3
3.3 Service conditions . 5
4  Abbreviated terms . 5
5 Pipeline rehabilitation process . 6
6  Investigation and condition assessment of the existing pipeline .6
6.1 Performance criteria . 6
6.1.1 General. 6
6.1.2 Hydraulic requirements . . 7
6.1.3 Structural requirements . 8
6.1.4 Environmental requirement . 8
6.1.5 Operational requirements . 8
6.2 Investigation of performance . 8
6.2.1 General. 8
6.2.2 Hydraulic investigation .10
6.2.3 Structural investigation .10
6.2.4 Environmental investigation .10
6.2.5 Operational investigation .11
6.3 Condition assessment .11
6.4 Risk analysis .11
6.5 Control measures .12
7  Classification and characteristics of rehabilitation techniques .12
7.1 Classification of renovation techniques.14
7.1.1 General.14
7.1.2 Lining with continuous pipes .14
7.1.3 Lining with close-fit pipes .16
7.1.4 Lining with cured-in-place pipes .20
7.1.5 Lining with discrete pipes.22
7.1.6 Lining with adhesive-backed hoses .25
7.1.7 Lining with spirally-wound pipes .27
7.1.8 Lining with pipe segments .30
7.1.9 Lining with a rigidly anchored plastics inner layer .31
7.1.10 Lining with sprayed polymeric materials .33
7.1.11 Lining with inserted hoses .35
7.2 Classification of trenchless replacement techniques .36
7.2.1 General.36
7.2.2 Pipe bursting .37
7.2.3 Pipe removal .39
7.2.4 Horizontal directional drilling — HDD .41
7.2.5 Impact moling .44
7.2.6 Pipe jacking .46
8  Selection of rehabilitation techniques .49
8.1 General .49
8.2 Pipeline system layout .49
8.3 Hydraulic performance .50
8.4 Structural performance .51
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8.4.1 General.51
8.4.2 Non-pressure pipes .51
8.4.3 Pressure pipes .52
8.5 Environmental impact .55
8.6 Construction constraints .56
8.7 Project specification .56
9  Implementation of rehabilitation techniques .57
9.1 Preconstruction activities .57
9.2 Inspection, storage and handling of the materials on site .58
9.3 Application of rehabilitation technique .58
9.3.1 Preparatory work .58
9.3.2 Construction .58
9.4 Acceptance control .59
9.4.1 General.59
9.4.2 Inspection .59
9.4.3 Leak tightness testing .59
9.4.4 Sampling.61
9.5 Completion of the work .61
9.5.1 Finishing off the rehabilitation work .61
9.5.2 Lateral reinstatement .61
9.6 Documentation of the process .61
Bibliography .62
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oSIST prEN ISO 11295:2021
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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 ISO/TC 138 Plastics pipes, fittings and valves for the transport of fluids,
Subcommittee SC 8, Rehabilitation of pipeline systems.
This third edition cancels and replaces the second edition (ISO 11295:2017), which has been technically
revised, to now sequentially cover all steps in process of design of pipeline rehabilitation.
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.
This edition includes the following significant changes with respect to the previous edition:
— Title is renewed from “Classification and information on design and applications of plastics piping
systems used for renovation and replacement” to “Plastics piping systems used for the rehabilitation of
pipelines — Classification and overview of strategic and operational activities”;
— Clause 5 is new and describes the whole process of pipeline rehabilitation with references to the
other clauses for further details;
— Clause 6 is new and deals with the strategic activities to possibly come to the decision to rehabilitate;
parts of the content of the former Clause 8 are included;
— Clause 7 is a contraction of the former Clauses 5, 6 and 7, with largely unchanged content;
— Clause 8 is new and handles further strategic activities needed to specify the rehabilitation project;
parts of the content of the former Clauses 8 and 9 are included;
— Clause 9 still covers installation aspects but is revised and content on acceptance control is
included now.
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oSIST prEN ISO 11295:2021
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Introduction
Pipeline systems are continuously required to satisfy physical, chemical, biochemical and biological
demands. These demands depend on planning, material, construction, type and period of use.
When pipeline systems become operational, they constitute a valuable asset to the network owner,
requiring adequate management. For general guidelines and requirement on asset management,
[28] [29] [30]
ISO 55000 , ISO 55001 and ISO 55002 are applicable.
For pipeline systems in particular, proper pipeline system management has to be put in place, including
monitoring the performance of the pipeline system.
For the specific case of pipelines for water supply and wastewater collection, detailed information on
[25] [26]
the overall management of the networks is provided by ISO 24516-1 and ISO 24516-3 .
In case a malfunctioning of a pipeline system is recognized, reactive measures initially focus on
improving regular maintenance procedures, including cleaning. In case of deterioration or other serious
defects, more stringent measures to rehabilitate the pipeline become necessary.
Rehabilitation is carried out when there is a need to restore or upgrade the performance of a
pipeline system. Rehabilitation can consist of repair, renovation or replacement. In recent years, the
rehabilitation of pipeline systems has become increasingly important and will continue to be so.
This document provides information on the design process when considering rehabilitation of an
existing pipeline, in order of sequence:
a) investigation and assessment of the deficiencies of current performance of the existing pipeline;
b) determination of viable options, based on performance criteria and process-related factors;
c) specification of the selected type of technique and the required pipe material;
d) the installation;
e) testing the performance.
The techniques used for the renovation and trenchless replacement of existing pipelines are classified
in technique families and the typical characteristics of each is described in general terms.
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oSIST prEN ISO 11295:2021
DRAFT INTERNATIONAL STANDARD ISO/DIS 11295:2021(E)
Plastics piping systems used for the rehabilitation of
pipelines — Classification and overview of strategic and
operational activities
1 Scope
This document sets out the steps of the overall process of pipeline rehabilitation, comprising:
— Information on strategic activities:
a) Investigation and condition assessment of the existing pipeline;
b) Pipeline rehabilitation planning;
c) Project specification.
— Information on and requirements for operational activities:
d) Application of techniques;
e) Documentation of the design and application process.
Definitions, classification and description of families of renovation and trenchless replacement
techniques are provided, including their areas of application such as underground drainage and
sewerage networks and underground water and gas supply networks.
NOTE 1 The following aspects are not covered by the scope of this document:
— new construction provided as network extension;
— calculation methods to determine, for each viable technique, the characteristics of lining or replacement pipe
material needed to secure the desired performance of the rehabilitated pipeline;
— techniques for local repair.
NOTE 2 It is the responsibility of the designer to choose and design the renovation or trenchless replacement
pipeline system.
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 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1043-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
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oSIST prEN ISO 11295:2021
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3.1 General
3.1.1
assessment
process, or result of this process, comparing a specified subject matter to relevant references
3.1.2
design working life
assumed period for which a structure or part of it is to be used for its intended purpose with anticipated
repair and maintenance but without renovation or replacement being necessary
3.1.3
hazard
biological, chemical, physical or radiological agent in, or condition of water, with the potential to cause
harm to public health
Note 1 to entry: Condition includes quantity.
3.1.4
pipeline system
interconnecting pipe network for the conveyance of fluids
[SOURCE: EN ISO 11298-1:2018-07, 3.1.1]
3.1.5
rehabilitation
measures for restoring or upgrading the performance of existing pipeline systems, including renovation
(3.1.6), repair (3.1.7) and replacement (3.1.8)
3.1.6
renovation
work incorporating all or part of the original fabric of the pipeline, by means of which its current
performance is improved
3.1.7
repair
rectification of local damage
3.1.8
replacement
construction of a new pipeline, on or off the line of an existing pipeline, where the function of the new
pipeline system incorporates that of the old
3.1.9
network extension
new construction off the line of a pipeline or a network with the aim to expand the total capacity of
the network
3.1.10
trenchless replacement
replacement (3.1.8) without opening trenches other than small excavations to provide access for the
particular technique
3.1.11
maintenance
routine work undertaken to ensure the continuing performance of a pipeline system(3.1.4)
3.1.12
independent pressure pipe liner
liner (3.2.3) capable on its own of resisting without failure all applicable internal loads throughout its
design life
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3.1.13
interactive pressure pipe liner
liner (3.2.3) which relies on the existing pipeline for radial support in order to resist without failure all
applicable internal loads throughout its design life
3.1.14
fully structural renovation
use of an independent pressure pipe liner (3.1.12) or a non-pressure pipe liner which is capable of resisting
all external loads and all externally induced post-lining deformations irrespective of the condition of
the existing pipeline
3.1.15
semi-structural renovation
use of an interactive pressure pipe liner (3.1.13) which is capable of long-term hole and gap spanning
at operational pressure or use of an independent pressure pipe liner (3.1.12) which is not capable of
resisting all external loads
3.1.16
flow diversion
temporary isolation of the section of pipeline to be rehabilitated by the use of a temporary bypass or
other means
3.2  Techniques
3.2.1
technique family
grouping of renovation (3.1.6) or trenchless replacement (3.1.10) techniques which are considered to
have common characteristics for standardization purposes
3.2.2
lining pipe
pipe inserted for renovation (3.1.6) purposes
3.2.3
liner
lining pipe (3.2.2) after installation
3.2.4
lining system
lining pipe (3.2.2) and all relevant fittings inserted into an existing pipeline for the purposes of
renovation (3.1.6)
3.2.5
lining with continuous pipes
lining with pipe made continuous prior to insertion, where the diameter of the lining pipe (3.2.2)
remains unchanged
3.2.6
lining with close-fit pipes
lining with a continuous pipe (3.2.5) for which the cross-section is reduced to facilitate installation and
reverted after installation to provide a close fit to the existing pipe
3.2.7
lining with cured-in-place pipes
lining with a flexible tube impregnated with a thermosetting resin, which produces a pipe after resin cure
3.2.8
lining with discrete pipes
lining with short lengths of pipe which are jointed to form a continuous pipe one by one during insertion
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3.2.9
lining with adhesive-backed hoses
lining with a reinforced hose which relies on an adhesive bond to the host pipe to provide resistance to
collapse
3.2.10
lining with spirally-wound pipes
lining with a profiled strip, spirally wound to form a continuous pipe after installation
3.2.11
lining with sprayed polymeric materials
lining with a sprayed two-part polymeric resin material that forms a continuous pipe after resin cure
3.2.12
lining with inserted hoses
lining with a reinforced hose which is either permanently shaped or re-rounded after installation by
the application of an internal pressure
3.2.13
lining with a rigidly anchored plastics inner layer
lining with a single rigid annulus of structural cementitious grout formed between a plastics layer and
the hos
...